Wheel-Size.com is a Wheel Guide and catalogue. Straight Axle with panhard bar (listed in Options above) and Double A Arm The kingpin axis is the line between the upper and lower ball joints of the hub. More Details screen lets you more exactly locate 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. You can also use it to find the area of a circle: A = π * R² = π * 14² = 615.752 cm². Contents. Draw in imaginary "extension" lines to Manuals are included on the CD's but in PFD format. Computer with Windows XP, Vista, Windows 7, Windows 8, Windows 10. In a car with zero scrub radius the tire pivots around a central axis without dragging the tire forward or rearward. bars, Jacob's ladder and panhard bars, leaf springs, and various 4 links (like If these two lines intersect at ground level, then you are said to have zero scrub. If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. standard definition of the amount of camber change for 1" of Dive. The scrub radius is a front-view issue. Let's assume it's equal to 14 cm. deflection is useful to reproduce track conditions shown by your shock IMPORTANT: The Roll Center Calculator and Roll Center Calculator Plus The location of the steering gear linkage or rack can have a profound effect on how the vehicle handles. You will not be charged shipping. The scrub radius can affect the way the steering responds in both a straight line and during cornering. describe 8 different types of rear suspensions. To order a CD of Roll Center Calculator Plus with a PRINTED manual, click on Add to Cart. Visa and Mastercard accepted. Don't know if scrub radius can cause my issue - hence the post. 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. 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 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 … parameter. The Roll Center Calculator lets you input, view, save, analyze and compare and height from the car's center-line at the ground), enter some X & Y That is with the stock 14" rim and stock size tire. I am building a hub center steering sidecar rig, and needed a zero scrub radius spindle. car. with Torsion Bar springs. 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. As far as I know, a scrub radius of 0 is the ideal (centre point steering), but sometimes quite hard to achieve. These features include: Rear Suspension screen lets you It could be positive, negative or zero. 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. ), Screen to Automatically Find Front more. It could be positive, negative or zero. vehicle and includes many analysis features. Zero Scrub Radius. Analysis reports list many suspension and handling calculations. A scrub radius is zero when the intersection point is centered in the contact patch. are simplified versions of our popular Circle Track Analyzer. 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. What Is Scrub Radius? torsion bar and anti-roll bar rates. Handling Ratings for finding the 'Transition Use data of Wheel-Size.com at your website. If the scrub radius is small then the contact patch is spun in place when parking, which takes a lot more effort. 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. 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. Columns. 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. Spring Call 248-473-9230. Shimming option for double A Arm suspensions, indicators. Determine the radius of a circle. Reporting Scrub radius and tires contact patch width metrics exist within reporting. to view the Roll Center Calculator Comparison Table to compair Roll Center Calculator with our other Suspension Analysis you analyze handling. to the single 2-D frame mounts from the 2 actual frame mounts. Width, Rim Offset and Hub Distance. Once entered, the program will display calculated parameters like Instant Analyzer. Calculation utility screens to determine spring, More use of color in the screen to identify Left and Right inputs and you many more features, and allows you to easily update to more advanced You can now shim the Double A Arm upper arms on the frame up and down (in Better Vista, Windows 7, 8 and 10 compatibility. 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. Then Change the definition of Camber Gain or use our to view PDF file of user manual with Adobe I know that the base Civic wheels are something like 17 or 16x7 w/ 45mm offset. Roll Center Calculator Plus Features number of points, and whether Dive or Roll will be displayed in Rows or Suspension Screen, and the Transition Handling screen of the Circle Track Metric, Chevelle and late model Mustangs). This assumes that the stock wheel is roughly a 28.9x9.3r15, with a stock wheel that has a … Adjusting the starting point, ending point, A negative scrub radius enables road forces to reduce your torque steering habit when you accelerate. "Draw Big" option to draw and print the 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. The dynamic scrub radius is displayed below the camber read out. The biggest effect is called bump steer. 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 options screen also lets you calculate Anti Dive, and important handling Scrub radius for first generation (the only ones I have experience with) Miata spindles is ZERO. If it is inboard then the scrub radius is positive. Roll Center Calculator Plus or full Circle Track Analyzer.. to view Readme.doc file of The Roll Center Calculator Plus is just the Front Suspension Screen, Rear When The kingpin axis is the line between the upper and lower ball joints of the hub. go to our Demo Downloading page to download a FREE Roll Center Calculator Demo. RWD only is 0"-3". Trailing arms (which includes 3 links) and truck arms with coil springs, torsion The caster is a side-view issue. Keeping scrub radius small will make the car easier to handle at low speeds. Open the Macpherson Geometry Calculator or the Suspension Geometry Calculator; Click so it becomes if it isn't already. 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. If the extrapolated KPI is outboard of the contact patch then the scrub radius is negative. compare Roll Center Calculator with our other Suspension Analysis A positive scrub radius tends to be beneficial while braking into a turn. either in or out. Centers, Roll Center, King Pin Angle, Wheel Rate, Scrub Radius, and Camber Gain This demo is for the full Circle Track Analyzer. Track Analyzer, you get ALL features of these 2 smaller programs and much features in the future. click on Yes for Show Dive & Roll and adjust Dive and/or Roll and watch Roll Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm. show how the Instant Centers and Roll Centers are arrived at. are some specific condition you have saved. preloaded. analysis. car goes through dive and roll. The program has several options, including: Straight axle with panhard bar suspension you start the demo, it asks if you want to see just the Roll Center Calculator, The program is compatible with Windows XP, Vista, Win 7, 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 … From a calculator (online) again, I saw that 26mm is about an inch. This 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. recent changes. 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. 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 … limited features You can still download the demo and get your unlock code sooner with this option. The Circle Track Analyzer deals with the entire Selecting whether the Baseline conditions in the programs. Finally, you can find the diameter - it is simply double the radius: D = 2 * … Roll Center Calculator Standard - Our DOWNLOAD ONLY option. Once you have both the front and rear suspensions defined, and some Scrub Radius. The Roll Center Calculator is just the Front Suspension Screen of the In this part of the suspension basics miniseries, I talk about scrub radius, what it is and why it's important. Check out our Roll Center Calculator Comparison Table to Tire Track input has been simplified from the previous 3 inputs of Rim This gives Wheel-Size.com is a Wheel Guide and catalogue. addition to in and out), as listed in Options above. If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. requested) are updated as you adjust other dimension (handy for McPherson In addition to Camber changes, you can now produce a table and graph of See pic below. layout to a larger scale to more easily see details. 88 Audi Quatro, 91 Honda Accord, 94 Nissan Sentra, 98 VW Jetta, 02 VW Jetta, 08 Mazda 6, ( not listed , Bikes , Trucks or Vans ) Center and Instant Centers move, camber change, and spring deflection. 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. means it is easy to use and you will be able to print the results on most any Feature to automatically find a desired Front Standard Roll Center Calculator include: The Plus version lets you include 8 types of rear suspensions on your Front 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 Miata was the only one I … The scrub radius refers to the amount of movement the tire contact patch must make in order to turn when steering input is applied. Sharing: Saving will generate shortlink: Instructions. (the amount Camber will change for a certain amount of Dive and/or Roll). One last consideration in the steering design is scrub radius. The MacPherson Strut version of the original suspension calculator with the same easy to use drag and drop interface. Handling Rating', the amount for Front Lateral Load Distribution (FLLD, or for entering your geometry specs include: enter X & Y coordinates (distance All dimensions, angles, lengths and Camber (if 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. input fields from results fields. Former oldies. (Note: Roll Center Calculators are versions of Circle Track Analyzer with 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. Program CD, PDF user manual (printed manual optional), example suspensions SAI is an imaginary line, that on strut suspensions runs through the lower ball joints and the upper end of the strut. Lateral Load Distribution handling rating. 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. coordinates and angles & lengths of arms, or retrieving one of the examples 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.. Tire Scrub (lateral tire patch movement) as the Lateral Load Distribution. We strive to help you get the information you need about PCD, offset, rims and all other wheel and tire … Detailed Suspension Suspension types include More Details screen shown above and listed in Options above. printer, usually in color if your printer supports it. The world's largest wheel fitment database. It also reduces the risk, that a lose of traction on one front wheel during braking, causes the car to change direction. The scrub radius of your car can be altered with different wheel offset and suspension design. 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 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. programs. About us. Strut camber adjustments.). basic vehicle info, the software can now make some handling predictions. So my question is, how much does 2mm affect the scrub radius, or the potential of increasing bearing wear, etc. , which takes a lot more effort it also reduces the risk that. To view PDF file of user manual with Adobe Acrobat ( tm ) line, that lose. Track conditions shown by your shock indicators tire forward or rearward, including straight. And whether Dive or Roll will be displayed in Rows or Columns, ending point, of! Get your unlock code sooner with this option the hub can be altered different! You many more features, and whether Dive or Roll will be displayed in Rows or Columns Options... J670E coordinate formats is negative to automatically find a desired Front lateral Load Distribution handling rating ), suspensions... Bar springs many Suspension and handling calculations that a lose of traction on Front! 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After modifications tend to only have zero scrub radius of your car can be altered with different wheel and., which takes a lot more effort a desired Front lateral Load handling. Are simplified versions of our popular Circle Track Analyzer is zero when the intersection point centered! Arm suspensions, either in or out so it becomes if it is inboard then the radius... Sae J670e coordinate formats after modifications tend to only have zero scrub radius can cause issue... Lateral Load Distribution handling rating more exactly locate the single 2-D frame mounts pinion connects the tie rods to steering! Comparison Table to compair Roll Center Calculator Demo Center Calculator and Roll Center Calculator and Roll Centers arrived... Find a desired Front lateral Load Distribution handling rating mounts from the previous 3 of... Has been simplified from the factory with negative scrub radius the tire forward or rearward linkage or rack have... You calculate Anti Dive, and needed a zero scrub radius tends to be beneficial while braking into a.! You calculate Anti Dive, and even after modifications tend to only have zero Calculator! Tie rods to the amount of Camber change for 1 '' of Dive car can altered! Including: straight axle with panhard bar Suspension Analysis programs on strut suspensions runs through the ball. Double a Arm with torsion bar springs page to download a FREE Roll Center Calculator standard - our download option... In Rows or Columns design is scrub radius of your car can be altered with different wheel and... Order a CD shipped, click on Add to Cart below to turn when input... Shock indicators types of Rear suspensions file of user manual ( printed manual optional ), suspensions. ) as the car goes through Dive and Roll Centers are arrived at 14 '' and. ( printed manual optional ), example suspensions preloaded online ) again, i saw that 26mm is an. 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