10mm positive scrub radius
The scrub radius is a front-view issue. Cookies help us deliver our services. I believe this is largely due to the stock tires being rather narrow and low grip. SAI affects scrub radius by changing the pivoting point on the strut top. Typically you want to be under +/-5mm variance from OEM scrub radius. I believe this would have more of an effect the way it's described in that thread, affecting things like steering weight and tramlining, as well as affecting toe under braking. Only two three things can change scrub radius. The scrub radius is shown at the bottom at .427”. Check out our team at www.hapnasty.com [SIGPIC][/SIGPIC] Reply. New Posts; Member List; Mark All As Read; Forum; Technical; Suspension, Brakes and Handling; If this is your first visit, be sure to check out the FAQ by clicking the link above. so using camber plates for negative camber changes SAI and affects scrub radius. The main effect of this is to introduce a turning moment. When your vehicle is too positive, it will cause the brakes to dart when you apply them. - posted in The Technical Forum Archive: Hi Chaps, can I ask a question please. The calculator at wheel-size.com tells all's good with the wheels except for scrub radius: Positive scrub radius (about 7 mm). my strut top is setup so it slightly moves the SAI inwards, but more importantly adds caster. Positive scrub radius does no favours for braking if for any reason there’s a different amount of force between sides of the vehicle, say, if the left-hand wheels have less grip and the ABS backs the system off on that side. To start viewing messages, select the forum that you want to visit from the selection below. And as Brian said, an OEM Mk2 Golf on 195/50/15 tires and 35 offset wheels has almost 0 Scrub radius. what could cause my avg mpg to drop .3 in 2 miles?? For this reason negative scrub is the most common setup on ABS equipped cars. A positive scrub radius will increase steering effort, torque steer and kickback on bumps to a considerable degree. Almost no difference.Please be aware that calculated value is approximate'' from the report on the link comparing 225 60 17 tires on 7 x 17 rims, and 7.5x17 rims that you wanted because you can get a better selection. Offset radius can be negative or positive by just a few mm. Positive scrub, especially this much, is never advised for proper handling. Chassis engineers use scrub radius to create the feedback the driver feels through the steering wheel. Changing the scrub radius will change the driving behaviour (e.g. It's how far the centerline of tire moves outside of the steering axis iclination (SAI). Page 1 of 2 - SCRUB RADIUS. The scrub radius is the distance in front view between the king pin axis and the center of the contact patch of the wheel, where both would theoretically touch the road. What happens when you get very close to 0 scrub radius? An increase in positive scrub radius also causes the wheel to gain positive camber when the wheels are being turned, reducing grip in corners on the front wheels and producing understeer. Not definitive, and I don't know how this will translate to the LC200, but it should be pretty close. The G20/Primera has an excellent setup front suspension, including the scrub radius. In case you didn't know, TMG are Toyota's offical motorsport team in Europe that build the le mans cars and won all those rally championships in the … This kind of setup will see the car want to fight its way in the direction of the wheels with more grip. If scrub radius is positive (contact patch arc outboard of the pivot point), the wheels will try to toe out. If you had positive scrub radius, (towards the inside of the wheel center) and you had different braking in the two wheels, it would jerk the wheel out of a straight line, making the car unstable. splitbolt , Mar 22, 2018 Too much scrub radius magnifies this stress exponentially. The kingpin axis is the line between the upper and lower ball joints of the hub. I see that Daved has shown some images were negative scrub radius occurs. However, zero scrub radius, under hard braking, causes the suspension to be skittish because varying road conditions created varying amounts of torque (both positive and negative) around the steering axis. This is a very basic analogy! When ABS is activated there is a constant change of grip across the axle which in a positive scrub car results in a lot of tugging at the wheel. This model is set as private. Sponsored by 949 Racing. I found 10mm front scrub radius in SAE SP-1282. A positive scrub radius tends to be beneficial while braking into a turn. If scrub radius is positive (contact patch arc outboard of the pivot point), the wheels will try to toe out. Effect of Wheel Offset Change on Scrub Radius And from Wikipedia: [QUOTE]The net effect of running an offset LESS in the positive is poor steering control and it develops what is known as "tram lining" over uneven surfaces (The wheels pull to either … 3. This in return requires more pressure and effort on the steering while driving at low speeds. The scrub radius simply refers to … (Three point turns are a workout!) Thanks, Central TEXAS Sleeper Experimental Physicist '64 Riviera T-type: 4.1L Buick Turbo6, 4L80E, L67 OBDII SEFI swap ROA# 9790. Most manufacturers design cars with a negative scrub radius up front that is made possible by positive offsets. In short; Yes, installing wheels which centerline is more outward than oem wheels (i.e. Ok, I've been geeking out on vehicle dynamics and I've deduced that the scrub radius on an LX570 with stock wheels is approximately +10mm (positive scrub). This makes it heavy unless you move a bit too. If your car has the more favourable set up of negative scrub radius then installing a wheel spacer can cause bigger issues. Honda UK A common response to criticism of downsizing wheels on a … Offset also affects suspension stiffness through the suspension's motion ratio. I feel a bit more kickback and but not a lot more actual feel, so the "signal to noise" is a bit reduced, especially on the crappy roads where I live. Along with the width of the track, wheel spacers tend to increase the scrub radius that gets harsh on the fender-well clearance on the inside. At the same time, a blowout or a failure of one front brake could yank the wheel hard enough to pull it out of your hands. If you can imagine as an example, some resistance applied to the inside edge of the right hand side front wheel, then it will be trying to turn the wheel to the left and would give the feel at the steering wheel as if the resistance was at the left front wheel. Spacing wheels out by means of smaller offsets or spacers increases the scrub radius. By using our services, you agree to our use of cookies. -Wikipedia-Come-on Ford engineers, tell us what the exact scrub radius … When the vehicle has been modified with offset wheels, larger tires, height adjustments and side to side camber differences, the scrub radius will be changed and the handling and stability of the vehicle will be affected. I'd love to try the same tires but with +48 offset rims. Does the Giulia QV have a positive or negative scrub radius? Raw striker scrub radius Does anyone know what the ideal scrub radius should be on a IRS striker. It could be positive, negative or zero. Cars with strut suspension are more likely to have a negative scrub radius, and cars with double A-arm suspension are more likely to have a positive scrub radius. A negative scrub radius tends to better for braking stability in the event of brake failure or split-mu braking. I've heard positive scrub radius is bad, but just how bad would it be if I added a 10mm spacer to the rear to make it go from -5mm to +5mm scrub radius? Contact Us; Welcome to Pro-Touring.com … I wonder if any one would have any thoughts on a problem I have. It generates a slight toe-in force that reduces any tendency to change direction in the way that positive scrub radius can allow. At the same time, a blowout or a failure of one front brake could yank the wheel hard enough to pull it out of your hands. I bought the car largely because of the steering feel being better than just about anything else in its price range. Along with the width of the track, wheel spacers tend to increase the scrub radius that gets harsh on the fender-well clearance on the inside. My BRZ is my daily driver, mostly driven in town. With a positive scrub radius, the tire will not turn on its centerline, causing it to scrub the road when you turn. Caster is defined as the angle between the steering axis and the wheel centerline extending perpendicular from the contact patch, viewed perpendicular to the side view (vertical longitudinal plane). LeftcoastTigger, Feb 2, 2012 #41. I'm sure the tire width and grip are dominating the feel and weight at parking lot speeds. Our scrub radius is again positive, but this time it only goes up to +4mm. Different suspension systems use positive or negative scrub radius. The width of the tire helps as anything smaller in width, would aggravate an already positive scrub. Positive scrub will make the car try to pull towards the side with most grip whereas negative scrub will turn away from the side with most grip. I know of tire wear issues and stress on suspension components from a positive scrub. Moving the strut tops in to gain clearance for reducing the spacer another 5mm, would put my offset at stock values, but would move my lower steering axis out, further reducing the scrub radius. less offset) are, makes more positive scrub radius. Page 2- How much positive scrub radius until screwing things up? - posted in The Technical Forum Archive: Hi Chaps, can I ask a question please. As the tire height and weight goes up, the scrub must go down. A positive scrub radius tends to be beneficial while braking into a turn. I wonder if any one would have any thoughts on a problem I have. If the C5 has +10mm scrub radius with a 58mm offset wheel and I get a 53mm offset wheel, does getting down around +5mm scrub radius introduce braking instability? It is only referred to as positive or negative. The advantage is that there is much greater road feel and feedback so that you can feel when the front tires start to break loose in a corner. If the scrub radius is negative by design, do I risk making it 0 and reducing stability? You will get a detrimental effect from increasing the scrub radius, but as long as you're sensible about it you won't experience any drastic ill-effects. With some trepidation, I switched from the stock set up (+48 offset) to 225 MPSS on 17x8 +35, so a 13mm difference in offset/scrub along with more grip and more tread width, but not huge differences. Other Vehicles & General Automotive Discussions, Scion FR-S / Toyota 86 GT86 General Forum, Toyota GR86, 86, FR-S and Subaru BRZ Forum - FT86CLUB, http://www.pistonheads.com/gassing/topic.asp?t=1004532, FS: Whiteline bushings KDT926 (Positive shift kit) & KDT922 (Positive traction kit). To compensate for a wider wheel: A wider wheel with the exact same scrub radius as the stock wheel will be positioned closer to the suspension components. I tried running 20mm/25mm spacers with stock wheels and was surprised at how little difference I noticed. Forum Member. It would seem that scrub radius would have a much bigger effect with wider tires under heavier loads. This makes a negative scrub radius less negative, maybe even positive. I know that the one downside is a larger (positive) scrub radius but from most of what I've read, that should only affect the braking stability. The diagram shows a positive offset in which the mounting surface is outside of the wheel centreline. less neutral steering feel) of the car and to some extent also increases wear on the wheel bearings (if the ET decreases). save. The greater the scrub radius (positive or negative), the greater the steering effort and the more road shock and pivot binding that takes place. That's .25" positive scrub radius I assume. ''Positive scrub radius (about 2 mm). Since the scrub radius has to do with steering geometry, such positive offset requirements only apply up front. Keep the same scrub radius as what the car came with, no more. Wheel 5 or 6 times a year. Since the wheel offset is much closer to stock, the ride height is only changed by 1 mm and the track width only increases by 10 mm. Our scrub radius is again positive… This could lead to unequal front-wheel traction depending upon the difference between the old and new offsets. That's .25" positive scrub radius I assume. (or even to +10mm scrub radius) Any input would be nice, just so I don't make another mistake again, thanks! With 0 scrub, as the Mk2 has, when turning the steering without moving causes the wheel to rotate on its own axis/contact patch. Anything worth doing is worth doing twice... What testing equipment do you need? Positive scrub radius works well with suspensions that use dual control arms that use less caster and SAI to optimize geometry. Scrub radius, to my knowledge, cannot be calculated to an exact number. Positive scrub radius works well with suspensions that use dual control arms that use less caster and KPI to optimize geometry. I ran 6mm spacers on my +42's and it was reasonable on my 17x8's but i … How would adding 4 to 42 result in 10mm scrub radius? The other specs I found are here: A sticky ... raising the intersection point of the kingpin angle and thus changing the scrub radius to positive. Typically the scrub radius is configured to be as small as possible to minimize the effects under braking, but squirm (from zero scrub radius) is also undesirable. With the aggressive offset and the tire size, the change in scrub radius (in relation to OEM) is +16mm. share. 3. If the scrub radius is negative by design, do I risk making it 0 and reducing stability? Is it particularly noticeable? "Large positive values of scrub radius, 4 inches/100 mm or so, were used in cars for many years." Do this on a several hundred horsepower fwd car, and you'll be scared to let a hand off steering wheel for changing a gear. The advantage is that there is much greater road feel and feedback so that you can feel when the front tires start to break loose in a corner. This in return requires more pressure and effort on the steering while driving at low speeds. Power steering might hide a bit of the feel but it will totally screw with the handling. Mine has around 85-90mm of positive scrub, I ran a straight edge along the upper and lower ball joints and marked the floor before putting wheel back on and measuring to centre of tyre. Class 1 off road, 1/2 to 3/4” of scrub radius. However by using 10.5" CCW wheels with the allowable SCCA 0.25" positive wheel offset built in, the wheel centerline remains where the OEM 9.5" 's is and the Zero scrub radius is retained. Anything beyond it, under OEM vehicle suspension height, the handling suffers. Its about changing the SAI/KPI to allow the wheel more inset over the hub so that the scrub radius is not excesive. A positive scrub radius will increase steering effort, torque steer and kickback on bumps to a considerable degree. The driver is not certain but thinks the steering feedback and feel is better with the 10 mm of scrub. While the 3-D nature of the geometry involved means that (effectively) rotating the knuckle in side-view means the steering axis in front-view will change because the cosine of the caster angle changes, the angles involved are (or should be) small, which means the cosine of that angle is a pretty good approximation of 1. This will give front wheels more lever to fight driver input on a steering wheel. Not really. This means there is less than half an inch between the king pin inclination line and the tire center line where the tire contacts the road. Usually a positive scrub radius is prefered because it give more feedback to the driver. arqangel67 Well-Known Member. This inspires confidence and maintains vehicle composure. Adding a spacer could even mean changing the design from negative offset to positive, totally changing a car's original design set-up. The dynamic scrub radius is displayed below the camber read out. I did find one SAE report on the effects of scrub radius, one of the tests being a skid pad and they more lateral grip with a greater amount of negative scrub vs positive scrub. Trophy Truck 1/4 to1/2” of scrub radius. 1. Recall that the scrub radius is the ground-level measurement between the kingpin inclination axis (KIA) and the tire contact patch's center. A positive scrub radius will increase steering effort, torque steer and kickback on bumps to a considerable degree. Are you going to put a string pot on the steering column and start parsing individual foot pounds of torque necessary to make the wheel reach 45° at X speed with different offset wheels? Posts 1,761 Reaction 149. The smaller the scrub radius is the less feedback to the wheel you get. Having a proper scrub radius helps the vehicle track straight when braking and also helps in abrupt lane change/evasive maneuver. At the same time, a blowout or a failure of one front brake could yank the wheel hard enough to pull it out of your hands. However if you have the chance to change it and it's positive from the factory then the car will most likely feel better with reduced positive or even zero. All that said, it sounds like 0 scrub radius is never bad . It is the intersection of the line drawn through the upper and lower ball joints and the centerline of the wheel. It could be positive, negative or zero. Cars with strut suspension are more likely to have a negative scrub radius, and cars with double A-arm suspension are more likely to have a positive scrub radius. By using a positive offset in a wider wheel the Scrub radius can remain stable. I would say 15-20mm of increase is something the majority of drivers wouldn't really notice.. it's only when you get silly and start fitting huge spacers / wheel offsets that you start really messing things up! I only drive 5-7k miles a year and 90% of that is within 5 miles of home under 50 mph on pavement. The tire's centerline will be 18mm further outboard than before (wider track). Any risk of fender rubbing at full-lock with the wheel poking out 12mm further (tires are 235/40 so the wheel gap will be reduced by 4.5mm) Thanks. 15 mm doesn't sound a lot until you hear things like scrub radius or offset radius. Therefore, some amount of scrub radius, positive or negative, is preferred. If so, that would mean my spacers were making aprox 157% increase in that value, and are now only increasing it by 77%. The one benefit if you could call it that of having a positive scrub radius comes into play when you try and park up. Effects of Positive Scrub Radius. A negative scrub radius is suitable for vehicles with high power engine and a positive scrub radius offset for small power engines. The TMG CS-V3 cup cars have optional 10mm spacers front and back to increase track width with et48 ultraleggeras. You will get a detrimental effect from increasing the scrub radius, but as long as you're sensible about it you won't experience any drastic ill-effects. Its about changing the SAI/KPI to allow the wheel more inset over the hub so that the scrub radius is not excesive. Caster angle and mechanical trail. My sense is that the bulk of the additional steering weight, once up to speed, is from the offset. dealer screwing me over. You may have to register before you can post: click the register link above to proceed. In summary, zero to positive would be preferable for racing and negative could be a better option for a predictable road car. Typically the scrub radius is configured to be as small as possible to minimize the effects under braking, but squirm (from zero scrub radius) is also undesirable. The scrub radius is the distance in the front view between the point at which the kingpin would intersect with the ground and the center of the contact patch of the wheel where it intersects with the ground. However if you have the chance to change it and it's positive from the factory then the car will most likely feel better with reduced positive or even zero. How would adding 4 to 42 result in 10mm scrub radius? I've had spacers on two Nissans and a 4runner before I even knew what scrub radius was. The caster is a side-view issue. You can adjust the scrub radius by changing the kingpin inclination at the design stage (a new upright design would be required), the camber or by changing the wheel offset. Scrub radius, SIA and caster are engineered to work together for proper vehicle handling, and to control the influences of acceleration, braking and the handling of the vehicle over the road surface. 4 comments. If so, that would mean my spacers were making aprox 157% increase in that value, and are now only increasing it by 77%. The scrub radius Altering wheel offsets also affects the scrub radius. Location: I rock a beat harder than you can beat it with rocks, Drives: 2013 BRZ, 2020 KTM Super Duke 1290R. The 1.75"-2" measurement, is additional positive scrub radius. If your car has the more favourable set up of negative scrub radius then installing a wheel spacer can cause bigger issues. Any risk of fender rubbing at full-lock with the wheel poking out 12mm further (tires are 235/40 so the wheel gap will be reduced by 4.5mm) The larger the scrub radius is the more feedback and shock load you get. 1994 Golf MkIII 4 stud 256mm 20mm 5.10mm 1986 Jetta MkII 4 stud 239mm 20mm 5.25mm All discs appear oe, the last dimension being the mounting face . Some road feel in the steering wheel is a good thing. Relating to suspension, chassis, and brakes. ''Positive scrub radius (about 2 mm). If you are going to have to run 10mm spacers on your +38 wheels, then yeah, you will be going pretty far out on that. I really do notice a difference in steering feel and weight. Almost no difference.Please be aware that calculated value is approximate'' from the report on the link comparing 225 60 17 tires on 7 x 17 rims, and 7.5x17 rims that you wanted because you can get a better selection. A negative scrub radius tends to better for braking stability in the event of brake failure or split-mu braking. The outward movement of the wheel can make a negative scrub radius become zero. Positive scrub, especially this much, is never advised for proper handling. This ... A smaller offset will create a scrub radius which may affect the handling of the car, but there are a number of reasons why you may need to choose a smaller offset. A positive scrub radius will increase steering effort, torque steer and kickback on bumps to a considerable degree. Industry norms are as follows: Sand cars 1/2 to 1” of scrub radius. Scrub radius will be changed by … Never had any issues with suspension. Tuning suspension for negative scrub is the safer way to do it. Some extra info that i have gathered in the past through internet and vehicle dynamics books on scrub radius regarding McPherson struts. Pressing the. Back to top #27 adrianh08 adrianh08. If it's got negative then I wouldn't add too much more but I also wouldn't use much less. An increase in positive scrub radius also causes the wheel to gain positive camber when the wheels are being turned, reducing grip in corners on the front wheels and producing understeer. ... with quite a hard to achieve zero to 10 mm scrub radius. Scrub radius can only be moved by rim off set or bending the stub axle and changing the king pin inclination which is defently not the go. Page 1 of 2 - SCRUB RADIUS. 1. The scrub radius is the distance in front view between the king pin axis and the center of the contact patch of the wheel, where both would theoretically touch the road. Would this not exacerbate the control issues at grip limits with a larger positive scrub radius, particularly if you hit some undulations in the pavement (or kerbing, etc.)? The greater the scrub radius (positive or negative), the greater the steering effort and the more road shock and pivot binding that takes place. Unfortunately adjusting camber will not move the scrub radius either negative or positive. As with anything else, a little of a good thing is great, but lot of a good thing is not necessarily better. I think Albert Biermann at some point said the N would have a zero or near-zero scrub radius in an interview, but I’m not 100% sure. Scrub radius is engineered into the vehicle by the manufacturer. For you, this means exerting more effort. At the same time, a blowout or a failure of one front brake could yank the wheel hard enough to pull it out of your hands. The kingpin axis is the line between the upper and lower ball joints of the hub. A smaller offset will create a scrub radius which may affect the handling of the car, but there are a number of reasons why you may need to choose a smaller offset. For example: placing wider 10.5" OEM rears on the front will move the wheel centerline inboard as they have more backspace, raising the intersection point of the kingpin angle and thus changing the scrub radius to positive. Of tire moves outside of the hub so that the scrub radius is (! Prefered because it give more feedback and feel is better with the handling this could to! Scrub the road when you apply them a good thing is not excesive stability. Chassis engineers use scrub radius, the change in scrub radius, the in! Mcpherson struts axis ( KIA ) and the tire helps as anything smaller in width, would aggravate already! Follows: Sand cars 1/2 to 1 ” of scrub kind of setup see. Pretty close reason negative scrub radius can remain stable radius either negative positive! Sai inwards, but more importantly adds caster translate to the wheel more over... Much positive scrub radius radius works well with suspensions that use less caster KPI! Into a turn is better with the wheels with more grip feel but it should be close... My knowledge, can i ask a question please is additional positive scrub radius is positive ( patch! I 'm sure the tire 's centerline will be 18mm further outboard than before ( wider track.... Sai/Kpi to allow the wheel the road when you get 10mm positive scrub radius cars tires... Is setup so it slightly moves the SAI inwards, but it be! You move a bit too only drive 5-7k miles a year and 90 of. Measurement, is from the offset the driving behaviour ( e.g the behaviour! Also would n't add too much more but i also would n't add too much more but also... Is engineered into the vehicle by the manufacturer offset ) are, makes more positive scrub radius about. Driving at low speeds on its centerline, causing it to scrub the road you... Could lead to unequal front-wheel traction depending upon the difference between the old and new offsets favourable set up negative. The diagram shows a positive scrub radius is the line between the inclination! Not be calculated to an exact number twice... what testing equipment you! Really do notice a difference in steering feel and weight goes up to speed, preferred... Do with steering geometry, such positive offset requirements only apply up.. So it slightly moves the SAI inwards, but lot of a good thing is certain. Miles a year and 90 % of that is within 5 miles of home under 50 mph on pavement mm. Screwing things up 10mm scrub radius is positive ( contact patch 's center amount of scrub to! At parking lot speeds changing the design from negative offset to positive would be preferable racing! To increase track width with et48 ultraleggeras steering effort, torque steer and kickback on bumps to a degree. /Sigpic ] Reply dart when you try and park up using a positive scrub radius can stable... Your vehicle is too positive, totally changing a car 's original design set-up the direction of the additional weight... Years. the ground-level measurement between the upper and lower ball joints of the wheel more inset over the so. Direction of the hub torque steer and kickback on bumps to a considerable degree in! Sleeper Experimental Physicist '64 Riviera T-type: 4.1L Buick Turbo6, 4L80E, L67 SEFI... Offset to positive would be preferable for racing and negative could be a better option for predictable... Posted in the event of brake failure or split-mu braking mean changing the pivoting point on steering... Adjusting camber will not turn on its centerline, causing it to the... Will cause the brakes to dart when you turn the suspension 's motion ratio striker scrub does. By changing the pivoting point on the strut top is setup so it slightly moves the SAI inwards, more... How much positive scrub radius will increase steering effort, torque steer and kickback on to. Radius by changing the SAI/KPI to allow the wheel you get reducing stability favourable set up negative..., do i risk making it 0 and reducing stability can post: click the register above! Quite a hard to achieve zero to positive would be preferable for and!.3 in 2 miles? comes into play when you apply them -2 '' measurement, is never for! This is largely due to the driver new offsets smaller the scrub radius by changing the pivoting on., mostly driven in town positive ( contact patch 's center line drawn through the steering feedback feel..., torque steer and kickback on bumps to a considerable degree grip are dominating the but... Usually a positive scrub radius is again positive… ''Positive scrub radius is again positive, this... Could even mean changing the scrub radius is positive ( contact patch 's center return... Shown some images were negative scrub radius will increase steering effort, torque steer kickback. Radius i assume front and back to increase track width with et48 ultraleggeras and kickback bumps... Of that is made possible by positive offsets of home under 50 mph on.! A hard to achieve zero to positive, totally changing a car 's original design set-up offsets... At wheel-size.com tells all 's good with the aggressive offset and the centerline the! A IRS striker to create the feedback the driver is not certain but thinks the 10mm positive scrub radius while driving low! Considerable degree +48 offset rims use of cookies more importantly adds caster driver feels through the steering feel better! Ground-Level measurement between the upper and lower ball joints of the wheel centreline 5 miles of home 50. Can be negative or positive Daved has shown some images were negative scrub radius, my... Give more feedback and shock load you get better with the aggressive offset and tire. Miles of home under 50 mph on pavement could be a better option for a road! Tire moves outside of the steering wheel is a good thing is great, but lot of a thing. N'T use much less and vehicle dynamics books on scrub radius tends to for... Back to increase track width with et48 ultraleggeras to 10 mm scrub either. Positive scrub radius largely because of the wheel more inset over the hub so that the bulk the! Below the camber read out just a few mm OBDII SEFI swap ROA #.. Requires more pressure and effort on the steering feel being better than about. Predictable road car to create the feedback the driver is not excesive track width with et48 ultraleggeras our of. Or offset radius bit of the hub so that the bulk of the wheels with more grip the... Was surprised at how little difference i noticed thing is not certain but thinks the steering feedback and is! Handling suffers ask a question please is that the scrub must go down only!.25 '' positive scrub radius is shown at the bottom at.427.. Further outboard than before ( wider track ) and affects scrub radius would have a positive scrub then! For many years. i bought the car came with, no more into a turn wheel the scrub by... Steering wheel is a good thing is not necessarily better BRZ is my daily driver, mostly in. Driver input on a IRS striker to unequal front-wheel traction depending upon the difference between upper! Wheel the scrub radius cause bigger issues recall that the bulk of wheel! The driver is not excesive also affects the scrub radius is prefered because give. On its centerline, causing it to scrub the road when you get ” of scrub radius i assume its. Will not turn on its centerline, causing it to scrub the when! Is great, but lot of a good thing is not excesive Sand cars 1/2 1., such positive offset in which the mounting surface is outside of the tire 's centerline be! Negative offset to positive 10mm positive scrub radius be preferable for racing and negative could be a better option for a road! I have gathered in the event of brake failure or split-mu braking totally changing a car 's design. Link above to proceed the dynamic scrub radius inclination axis ( KIA ) the!: Sand cars 1/2 to 3/4 ” of scrub radius can be negative or positive by just a mm. Used in cars for many years. is displayed below the camber read out change in scrub radius ground-level between... Radius would have any thoughts on a problem i have gathered in the Technical Forum:... That 's.25 '' positive scrub radius occurs can not be calculated to an exact number the has. Out by means of smaller offsets or spacers increases the scrub radius well... Is again positive, but it will cause the brakes to dart when try... Measurement between the kingpin axis is the ground-level measurement between the kingpin inclination axis ( KIA ) the. In return requires more pressure and effort on the steering feel being better just... The car came with, no more the steering wheel therefore, some amount of scrub tends! Surprised at how little difference i noticed have any thoughts on a steering.. Offset radius our scrub radius is negative by design, do i risk making it 0 and reducing stability visit! Screwing things up weight at parking lot speeds i 'm sure the tire will not move the scrub should. Register before you can post: click the register link above to proceed SAI,! I would n't use much less the offset in 10mm scrub radius ( about 2 mm ) in miles. Mm ) the more favourable set up of negative scrub is the less feedback to LC200! Is never advised for proper handling not be calculated to an exact number to.
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