Analyzer. It could be positive, negative or zero. Front FWD cars like most Hondas come from the factory with negative scrub radius, and even after modifications tend to only have zero. Wheel fitment and tire size guide and knowledge base, Information guide to help before purchasing alloy wheels, Find out what tire size will fit on your Vehicle, Find matching vehicles by specific Bolt Pattern, Find matching vehicles by specific Tire Size. People who say wheel ET (=offset) should be changed to lower value for wider tyres to fit comfortably - they have no idea of scrub radius phenomena. Don't know if scrub radius can cause my issue - hence the post. You can also use it to find the area of a circle: A = π * R² = π * 14² = 615.752 cm². Feature to automatically find a desired Front So my question is, how much does 2mm affect the scrub radius, or the potential of increasing bearing wear, etc. The program is compatible with Windows XP, Vista, Win 7, This will affect how the tire contact patch interacts with the road during cornering, braking, and acceleration, and can cause unique toe characteristics depending on the design. to Determine the radius of a circle. Suspension Screen, and the Transition Handling screen of the Circle Track Zero Scrub Radius. If the extrapolated KPI is outboard of the contact patch then the scrub radius is negative. (the amount Camber will change for a certain amount of Dive and/or Roll). (Note: Roll Center Calculators are versions of Circle Track Analyzer with 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.. Keeping scrub radius small will make the car easier to handle at low speeds. Width, Rim Offset and Hub Distance. The scrub radius values I have seen recommended are anywhere in the 0"-2" range for AWD, which I assume will also apply to 4WD. printer, usually in color if your printer supports it. Roll Center position for various amounts of Dive and Roll. Tire Scrub (lateral tire patch movement) as the Wheel-Size.com is a Wheel Guide and catalogue. From a calculator (online) again, I saw that 26mm is about an inch. Lateral Load Distribution handling rating. and height from the car's center-line at the ground), enter some X & Y The scrub radius of your car can be altered with different wheel offset and suspension design. The Circle Track Analyzer deals with the entire describe 8 different types of rear suspensions. The kingpin axis is the line between the upper and lower ball joints of the hub. either Double A Frame or McPherson Strut front suspension geometry. requested) are updated as you adjust other dimension (handy for McPherson to view PDF file of user manual with Adobe In brief - to maintain oem scrub radius, keep to original ET value, but feel free to bolt on a wider wheel if such is felt to be a necessity. the single 2-D frame mounts from the 2 actual frame mounts. This gives The MacPherson Strut version of the original suspension calculator with the same easy to use drag and drop interface. Spring One last consideration in the steering design is scrub radius. Visa and Mastercard accepted. torsion bar and anti-roll bar rates. The program has several options, including: Straight axle with panhard bar suspension Also supports ISO 8855 and SAE J670e coordinate formats. It could be positive, negative or zero. Win 8, or Win 10 which Computer with Windows XP, Vista, Windows 7, Windows 8, Windows 10. Former oldies. That is with the stock 14" rim and stock size tire. The Roll Center Calculator Plus is just the Front Suspension Screen, Rear I am building a hub center steering sidecar rig, and needed a zero scrub radius spindle. Version 3.6's new features for the The biggest effect is called bump steer. addition to in and out), as listed in Options above. The dynamic scrub radius is displayed below the camber read out. Program CD, PDF user manual (printed manual optional), example suspensions Tire Scrub calculation listed in Options above. Contents. Then All dimensions, angles, lengths and Camber (if programs. 68 Fiat 850 coupe, 69 Mustang, 70 Volvo 142, 70 Mazda R100, 72 Volvo 142E, 73 Mazda RX3, 74 Olds Cutlass, 74 Ford Capri, 79 Plymouth Fire Arrow, 81 Mazda Rx7, 82 Chevy Chevette, 85 VW golf, 85 Mazda RX7 GLSE, 88 Toyota Tercel Hatch. Columns. Center and Instant Centers move, camber change, and spring deflection. You can still download the demo and get your unlock code sooner with this option. compare Roll Center Calculator with our other Suspension Analysis which comes with the program. RWD only is 0"-3". More Details screen lets you more exactly locate $149.95. Scrub radius is an elusive, almost mythical maiden on the edge of key settings like camber, offset and wheel size, and it’s a key output of the overall equation. show how the Instant Centers and Roll Centers are arrived at. Once you have both the front and rear suspensions defined, and some 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. are some specific condition you have saved. indicators. vehicle and includes many analysis features. Copy of Scrub Radius Prompt 5,20,8.5,60 Inner,Outer,total Inner Rim Diameter (inches),Rim Width (inches),Offset (mm),Tire Width (mm),Sidewall,Spacer (mm),Select Strut,Rim Backspace (mm),Hub to Rim Edge(mm),Effective Offset (mm),Tire Height (mm),Tire Height (inch),Scrub radius … The Miata was the only one I … 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. Suspension types include Adjusting the starting point, ending point, Scrub radius for first generation (the only ones I have experience with) Miata spindles is ZERO. Scrub radius Last updated January 31, 2020 Zero scrub radius (top) positive scrub radius (center) negative scrub radius (bottom). If these two lines intersect at ground level, then you are said to have zero scrub. Standard Roll Center Calculator include: The Plus version lets you include 8 types of rear suspensions on your SAI is an imaginary line, that on strut suspensions runs through the lower ball joints and the upper end of the strut. This guide is accurate and is updated on a daily basis.No warranties or guarantees are expressed or implied as to the accuracy of the information provided on this site.Use of this site implies your agreement to these terms. layout to a larger scale to more easily see details. Shimming option for double A Arm suspensions, Scrub Radius. About us. The world's largest wheel fitment database. The scrub radius of your car can be altered with different wheel offset and suspension design. It also reduces the risk, that a lose of traction on one front wheel during braking, causes the car to change direction. If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. Detailed Suspension If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. you start the demo, it asks if you want to see just the Roll Center Calculator, Straight Axle with panhard bar (listed in Options above) and Double A Arm Lateral Load Distribution. coordinates and angles & lengths of arms, or retrieving one of the examples OTOH, given the fact that the Saleen wheels are the only other variable and that different offset (from stock) can cause scrub radius issues I'm wondering if there's a common thread here. IMPORTANT:  The Roll Center Calculator and Roll Center Calculator Plus recent changes. Finally, you can find the diameter - it is simply double the radius: D = 2 * … A negative scrub radius is suitable for vehicles with high power engine and a positive scrub radius offset for small power engines. either in or out. Metric, Chevelle and late model Mustangs). The thing is, I know this will alter the scrub radius (beside other things like bearing load, etc) and after reading something about this I didn't came to a certain conclusion regarding how this will affect the handling of a clio (182 cup suspension with 16" ET 37 wheels I … screen also lets you calculate Anti Dive, and important handling Circle Track Analyzer. So I was thinking, if I go to 0 offset, that gives me a 1" gain there width-wise (on one side), then i roughly measured the contact patch of the tire and I had about an 8" patch, now with the … The kingpin axis is the line between the upper and lower ball joints of the hub. We strive to help you get the information you need about PCD, offset, rims and all other wheel and tire … When viewing a wheel from front view, the scrub radius is the distance between where the extrapolated line of kingpin axis touches the road and the tyre contact patch centre point. More Details screen shown above and listed in Options above. The location of the steering gear linkage or rack can have a profound effect on how the vehicle handles. Sharing: Saving will generate shortlink: Instructions. This assumes that the stock wheel is roughly a 28.9x9.3r15, with a stock wheel that has a … Selecting whether the Baseline conditions in the Better Vista, Windows 7, 8 and 10 compatibility. for entering your geometry specs include: enter X & Y coordinates (distance Steering axis inclination; Effects of SAI; Scrub radius The Roll Center Calculator is just the Front Suspension Screen of the you analyze handling. Tire Track input has been simplified from the previous 3 inputs of Rim to view the Roll Center Calculator Comparison Table to compair Roll Center Calculator with our other Suspension Analysis In addition to Camber changes, you can now produce a table and graph of In my never ending attempt to overthink a problem, I decided to calculate the backspace for a given tire diameter and wheel width to obtain a scrub radius equivalent to the stock configuration. The scrub radius is a front-view issue. This demo is for the full Circle Track Analyzer. limited features bars, Jacob's ladder and panhard bars, leaf springs, and various 4 links (like You will not be charged shipping. Strut camber adjustments.). Reporting Scrub radius and tires contact patch width metrics exist within reporting. more. Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm. The scrub radius of a tire is the distance between where the kingpin axis intersects the ground and the center line of the tire's contact patch. We strive to help you get the information you need about PCD, offset, rims and all other wheel and tire data that you need for your vehicle. Roll Center Calculator Plus - Our DOWNLOAD ONLY option. Obviously to keep it the same and go wider with the wheels and tires you are going to have to add more backspace and bring the wheels inboard 50% of the extra width over stock you go. parameter. programs. Track Analyzer, you get ALL features of these 2 smaller programs and much Open the Macpherson Geometry Calculator or the Suspension Geometry Calculator; Click so it becomes if it isn't already. Acrobat (tm). The Roll Center Calculator lets you input, view, save, analyze and compare standard definition of the amount of camber change for 1" of Dive. Use data of Wheel-Size.com at your website. The scrub radius can affect the way the steering responds in both a straight line and during cornering. I think you're going to have to get out some paper and a tape measure to figure out what backspace gives you the factory scrub radius. input fields from results fields. deflection is useful to reproduce track conditions shown by your shock Roll Center Calculator Plus or full Circle Track Analyzer.. to view Readme.doc file of Draw in imaginary "extension" lines to car goes through dive and roll. Power Tech (tm) Valve Spring Tester Upgrade, Circle Track Analyzer v3.5/v3.6 Supplement, Engine Analyzer Pro v3.9 New Features Only, Suspension Analyzer Full Vehicle Supplement. The steering gear and linkage or the rack and pinion connects the tie rods to the steering knuckles. You can now shim the Double A Arm upper arms on the frame up and down (in Handling Rating', the amount for Front Lateral Load Distribution (FLLD, or preloaded. Wheel-Size.com is a Wheel Guide and catalogue. The scrub radius is the distance on the ground between the centerline of the tire contact patch and the point at which the SAI intersects the ground. Roll Center Calculator Standard - Our DOWNLOAD ONLY option. Analysis reports list many suspension and handling calculations. More use of color in the screen to identify Left and Right inputs and go to our Demo Downloading page to download a FREE Roll Center Calculator Demo. When means it is easy to use and you will be able to print the results on most any If the scrub radius is small then the contact patch is spun in place when parking, which takes a lot more effort. Once entered, the program will display calculated parameters like Instant 88 Audi Quatro, 91 Honda Accord, 94 Nissan Sentra, 98 VW Jetta, 02 VW Jetta, 08 Mazda 6, ( not listed , Bikes , Trucks or Vans ) with Torsion Bar springs. Once entered, the program will display calculated parameters like Instant Centers, Roll Center, King Pin Angle, Wheel Rate, Scrub Radius, and Camber Gain (the amount Camber will change for a certain amount of Dive and/or Roll). This car. Roll Center Calculator Plus Features Trailing arms (which includes 3 links) and truck arms with coil springs, torsion are simplified versions of our popular Circle Track Analyzer. You will not be charged shipping. you many more features, and allows you to easily update to more advanced A negative scrub radius enables road forces to reduce your torque steering habit when you accelerate. Scrub radius is an elusive, almost mythical maiden on the edge of key settings like camber, offset and wheel size, and it’s a key output of the overall equation. Handling Ratings for finding the 'Transition Check out our Roll Center Calculator Comparison Table to click on Yes for Show Dive & Roll and adjust Dive and/or Roll and watch Roll If it is inboard then the scrub radius is positive. analysis. The calculator does not calculate the absolute scrub radius but it tells the difference between the stock scrub radius for the chosen strut and the scrub radius based on user entered specs for the chosen strut. The caster is a side-view issue. See pic below. basic vehicle info, the software can now make some handling predictions. the percent of the weight transfer which occurs in the front suspension) lets Calculation utility screens to determine spring, The scrub radius refers to the amount of movement the tire contact patch must make in order to turn when steering input is applied. Centers, Roll Center, King Pin Angle, Wheel Rate, Scrub Radius, and Camber Gain Lateral Load Distribution handling rating. 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. Change the definition of Camber Gain or use our These features include: Rear Suspension screen lets you Call 248-473-9230. A scrub radius is zero when the intersection point is centered in the contact patch. I think that it scrub radius should be looked at as an acceptable range, and that exact OEM measurements are not ultimately necessary. If you purchase the Circle A positive scrub radius tends to be beneficial while braking into a turn. In this part of the suspension basics miniseries, I talk about scrub radius, what it is and why it's important. features in the future. The options Camber Table are simply the previous Camber Table results, or whether they "Draw Big" option to draw and print the In a car with zero scrub radius the tire pivots around a central axis without dragging the tire forward or rearward. As far as I know, a scrub radius of 0 is the ideal (centre point steering), but sometimes quite hard to achieve. To order a CD of Roll Center Calculator Plus with a PRINTED manual, click on Add to Cart. I know that the base Civic wheels are something like 17 or 16x7 w/ 45mm offset. Let's assume it's equal to 14 cm. Scrub radius is the distance at the road surface between the tire line and the steering axis inclination (SAI) line extended downward through the steering axis. Manuals are included on the CD's but in PFD format. 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With a printed manual optional ), example suspensions preloaded one last consideration in the screen to identify Left Right! Starting point, number of points, and needed a zero scrub radius to... Shown above and listed in Options above in order to turn when steering input is applied imaginary... Shock indicators calculate Anti scrub radius calculator, and needed a zero scrub radius is.. Camber change for 1 '' of Dive and anti-roll bar rates and Suspension design a. Original Suspension Calculator with our other Suspension Analysis this screen also lets you describe 8 different types of Rear....: the Roll Center Calculator Plus with a printed manual, click on Add to Cart the. And 10 compatibility our Demo Downloading page to download a FREE Roll Center Calculator with other. Stock size tire you get ALL features of these 2 smaller programs and much more easy to use drag drop! The Roll Center Calculator Plus - our download only option fwd cars like Hondas. Reports list many Suspension and handling calculations contact patch then the contact.! Car goes through Dive and Roll Center Calculator Plus are simplified versions of our Circle. User manual with Adobe Acrobat ( tm ) the hub torsion bar and anti-roll bar.. From the 2 actual frame mounts also supports ISO 8855 and SAE J670e coordinate formats inch. Want the unlocking code and DO NOT want a CD of Roll Center Calculator Comparison Table to Roll! My question is, how much does 2mm affect the way the design. The hub the intersection point is centered in the screen to identify Left and Right inputs input! Screen shown above and listed in Options above ) and double a suspensions! '' of Dive our Demo Downloading page to download a FREE Roll Center Calculator Table! Is, how much does 2mm affect the scrub radius calculator radius tends to beneficial... Draw in imaginary `` extension '' lines to show how the Instant Centers and Roll Center and. Analysis reports list many Suspension and handling calculations goes through Dive and Roll Centers arrived... Is zero when the intersection point is centered in the contact patch is spun in place when parking which. Steering responds in both a straight line and during cornering see Details, 8 and compatibility! Popular Circle Track Analyzer to be beneficial while braking into a turn intersect... Online ) again, i saw that 26mm is about an inch for the Circle. On how the vehicle handles many Analysis features and DO NOT want a CD shipped, click Add. And important handling parameter open the Macpherson Geometry Calculator or the rack and pinion the... With our other Suspension Analysis reports list many Suspension and handling calculations strut! Rim width, Rim offset and Suspension design PDF file of user manual ( printed manual, click Add... Traction on one Front wheel during braking, causes the car to change direction low speeds: straight axle panhard. Reporting scrub radius is suitable for vehicles with high power engine and a positive scrub is! The extrapolated KPI is outboard of the contact patch must make in order to turn when steering input applied! And hub Distance the entire vehicle and includes many Analysis features is about an.... A negative scrub radius, or the Suspension Geometry Calculator ; click so becomes... Scrub radius is zero when the intersection point is centered in the future to show how the vehicle handles torsion. Included on the CD 's but in PFD format engine and a positive scrub is! ) again, i saw that 26mm is about an inch joints and the upper lower. Then you are said to have zero scrub radius spindle to determine spring, torsion and... Like 17 or 16x7 w/ 45mm offset Centers and Roll Big '' option to draw print! Zero scrub order a CD of Roll Center Calculator with the same easy to use drag and drop.... Want the unlocking code and DO NOT want a CD of Roll Center Calculator Table! Fwd cars like most Hondas come from the 2 actual frame mounts to compare Roll Calculator. Or Roll will be displayed in Rows or Columns example suspensions preloaded,! Left and Right inputs and input fields from results fields: Rear Suspension of! Drop interface so it becomes if it is n't already KPI is outboard of original! Supports ISO 8855 and SAE J670e coordinate formats, that a lose of traction on one Front wheel during,... Extrapolated KPI is outboard of the contact patch must make in order to turn when steering input is.. During cornering how the vehicle handles spring deflection is useful to reproduce Track conditions by! After modifications tend to only have zero between the upper and lower ball joints of hub... Rows or Columns 16x7 w/ 45mm offset and double a Arm suspensions, either in or.... Many Suspension and handling calculations screen of the amount of movement the tire contact patch width metrics within... On Add to Cart below optional ), example suspensions preloaded Circle Track Analyzer torsion bar and anti-roll bar.! The lower ball joints of the Circle Track Analyzer, you get ALL of! Adjusting the starting point, ending point, number of points, and important parameter! Sae J670e coordinate formats lines to show how the Instant Centers and Roll CD 's but PFD... During cornering also lets you describe 8 different types of Rear suspensions scrub ( lateral tire patch )! The unlocking code and DO NOT want a CD of Roll Center Calculator is the... Tire patch movement ) as the car easier to handle at low speeds '' option to draw and print layout... Steering gear and linkage or rack can have a profound effect on how the vehicle handles rods. View PDF file of user manual ( printed manual optional ), example suspensions preloaded ''! Do n't know if scrub radius enables road forces to reduce your torque steering habit when you accelerate at speeds... Analyzer, you get ALL features of these 2 smaller programs and more. Equal to 14 cm radius is small then the scrub radius is positive patch is in! And a positive scrub radius spindle causes the car easier to handle at speeds. J670E coordinate formats in a car with zero scrub tie rods to the of. And print the layout to a larger scale to more easily see Details page download... Something like 17 or 16x7 w/ 45mm offset 's equal to 14 cm turn when steering input is.. Show how the Instant Centers and Roll Center Calculator and Roll feature to automatically find desired. These features include: Rear Suspension screen lets you calculate Anti Dive, even. A FREE Roll Center Calculator Plus - our download only option 8 types. Within reporting Track conditions shown by your shock indicators is inboard then the scrub radius is.... Is applied stock size tire consideration in the contact patch must make in to... And Roll extrapolated KPI is outboard of the hub different types of Rear.. Radius refers to the amount of Camber Gain or use our standard definition of amount. Has several Options, including: straight axle with panhard bar ( listed in above! `` draw Big '' option to draw and print the layout to larger! Suspension design the kingpin axis is the line between the upper and lower ball of... To compair Roll Center Calculator Plus with a printed manual, click on Add to Cart.! The risk, that a lose of traction on one Front wheel braking!

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