Alloy Wheel & tyre fitment calculator - it calculates inset, poke, speedo error, tyre stretch & loads more.
Tire Tech Information - The Wheel Fitment, Tyre Stretch, Rolling Radius and Speedometer Error Calculator. Play with specs, try different settings, compare results
Note your cars jacking points, a jack should only be fitted to these areas to lift the car. Use a chock under the wheel to prevent the car rolling whilst it's being jacked up. Release the handbrake (the chocks will keep the car in place). Loosen all the nuts slightly a quarter turn...
There is a radius deviation between the rolling tire and the value calculated by this equation. According to the equation, the deviation is linear. To prepare the experimental vehicle and the vehicle model determined by real car calibration, the tire rotation factor is introduced in the 0–30 ...