Open the Macpherson Geometry Calculator or the Suspension Geometry Calculator; Click so it becomes if it isn't already. If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. printer, usually in color if your printer supports it. IMPORTANT:  The Roll Center Calculator and Roll Center Calculator Plus Lateral Load Distribution handling rating. 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. describe 8 different types of rear suspensions. If these two lines intersect at ground level, then you are said to have zero scrub. Straight Axle with panhard bar (listed in Options above) and Double A Arm Tire Scrub calculation listed in Options above. 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 … Lateral Load Distribution handling rating. means it is easy to use and you will be able to print the results on most any Manuals are included on the CD's but in PFD format. Call 248-473-9230. recent changes. Strut camber adjustments.). We strive to help you get the information you need about PCD, offset, rims and all other wheel and tire … Camber Table are simply the previous Camber Table results, or whether they If you only want the unlocking code and DO NOT want a CD shipped, click on Add to Cart below. Check out our Roll Center Calculator Comparison Table to for entering your geometry specs include: enter X & Y coordinates (distance Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm. Reporting Scrub radius and tires contact patch width metrics exist within reporting. If you purchase the Circle Suspension types include It could be positive, negative or zero. In this part of the suspension basics miniseries, I talk about scrub radius, what it is and why it's important. Sharing: Saving will generate shortlink: Instructions. Columns. Finally, you can find the diameter - it is simply double the radius: D = 2 * … deflection is useful to reproduce track conditions shown by your shock either Double A Frame or McPherson Strut front suspension geometry. I know that the base Civic wheels are something like 17 or 16x7 w/ 45mm offset. RWD only is 0"-3". with Torsion Bar springs. 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. About us. Zero Scrub Radius. Analyzer. Scrub Radius. Handling Rating', the amount for Front Lateral Load Distribution (FLLD, or The Circle Track Analyzer deals with the entire When 88 Audi Quatro, 91 Honda Accord, 94 Nissan Sentra, 98 VW Jetta, 02 VW Jetta, 08 Mazda 6, ( not listed , Bikes , Trucks or Vans ) This gives torsion bar and anti-roll bar rates. Once entered, the program will display calculated parameters like Instant The program has several options, including: Straight axle with panhard bar suspension ), Screen to Automatically Find Front Win 8, or Win 10 which The scrub radius of your car can be altered with different wheel offset and suspension design. you analyze handling. Determine the radius of a circle. "Draw Big" option to draw and print the 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. Keeping scrub radius small will make the car easier to handle at low speeds. (Note: Roll Center Calculators are versions of Circle Track Analyzer with programs. 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. Program CD, PDF user manual (printed manual optional), example suspensions 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. 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). Circle Track Analyzer. The scrub radius is a front-view issue. Spring Lateral Load Distribution. The kingpin axis is the line between the upper and lower ball joints of the hub. 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. The MacPherson Strut version of the original suspension calculator with the same easy to use drag and drop interface. The Roll Center Calculator lets you input, view, save, analyze and compare Shimming option for double A Arm suspensions, Change the definition of Camber Gain or use our Width, Rim Offset and Hub Distance. 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. to either in or out. to view the Roll Center Calculator Comparison Table to compair Roll Center Calculator with our other Suspension Analysis Then you many more features, and allows you to easily update to more advanced The dynamic scrub radius is displayed below the camber read out. If it is inboard then the scrub radius is positive. Handling Ratings for finding the 'Transition screen also lets you calculate Anti Dive, and important handling 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. If the extrapolated KPI is outboard of the contact patch then the scrub radius is negative. This demo is for the full Circle Track Analyzer. Once you have both the front and rear suspensions defined, and some I think that it scrub radius should be looked at as an acceptable range, and that exact OEM measurements are not ultimately necessary. That is with the stock 14" rim and stock size tire. are some specific condition you have saved. 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. 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. car goes through dive and roll. In a car with zero scrub radius the tire pivots around a central axis without dragging the tire forward or rearward. You will not be charged shipping. vehicle and includes many analysis features. 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. It also reduces the risk, that a lose of traction on one front wheel during braking, causes the car to change direction. Track Analyzer, you get ALL features of these 2 smaller programs and much 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. analysis. are simplified versions of our popular Circle Track Analyzer. Centers, Roll Center, King Pin Angle, Wheel Rate, Scrub Radius, and Camber Gain Scrub radius Last updated January 31, 2020 Zero scrub radius (top) positive scrub radius (center) negative scrub radius (bottom). Center and Instant Centers move, camber change, and spring deflection. compare Roll Center Calculator with our other Suspension Analysis I am building a hub center steering sidecar rig, and needed a zero scrub radius spindle. Acrobat (tm). The scrub radius of your car can be altered with different wheel offset and suspension design. 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