AC Owners Club Forum

AC Owners Club Forum => Mk IV, Superblower, CRS and other Continuation Cars Forum => Topic started by: RJE on February 23, 2024, 15:14:43

Title: Speedometer calibration
Post by: RJE on February 23, 2024, 15:14:43

Please can anyone tell me the impact of changing from 16" wheels and tyres to 15" wheels running Avon CR6ZZ on the standard Mk4 speedo? Thanks.

Title: Re: Speedometer calibration
Post by: Flyinghorse on February 25, 2024, 19:28:16

You can work it out yourself using one of these calculators( many online):
https://www.tyresizecalculator.com/tyre-wheel-calculators/speedo-error-calculator

Title: Re: Speedometer calibration
Post by: RJE on February 26, 2024, 12:30:20

Thank you, I wasn't aware of the calculator on line but now I've checked it it confirms my own calculations, which is helpful.