AC Owners Club Forum > Mk IV, Superblower, CRS and other Continuation Cars Forum

Speedometer calibration

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RJE:
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.

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

RJE:
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.

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