Featured Articles >> [WHEELS] Tire Size / Speedometer Error Calculator
This script is for comparing original equipment tire size to alternate after market tire sizes.
The following is an example to help to decode a tire size like 185/65R14
185 = tire width in millimeters, measured from sidewall to sidewall
60 = sidewall ratio, the ratio of sidewall height to tire width
15 = wheel rim diameter in inches
Wheel Speed Calibration script... https://www.celicahobby.com/tech/speedcalc.html