this post was submitted on 22 Jul 2024
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You don't even need to swap wheels. If a car is sold with multiple wheel size options, there's a solid chance that the speedo is calibrated for one size only.
My car is a 2012 model and the speedo is off by at least 10% compared to speed radar displays I've driven by.
That would be very naughty of the manufacturer on a 2012… the wheel speed sensor would be connected to a computer and speed PID reported on the canbus, the computer should be calibrated to the trim level of the car (and the wheels that it came with) to report the correct speed.
Having said that manufacturers often overestimate speed by ~5% to prevent being blamed for speeding offences.
That's a fantastic idea, however corners exist only to be cut.