Does the speedometer calculate speed off the front wheels or the rear?
Basically, I'm trying to figure out which tire diameter is crucial to keep speedometer readings accurate.
Also, how much can you change the relative tire diameters from stock before it messes up the stability functions, brake anti-lock, etc.
The stock rear is 668mm and the stock front is 654mm. 14mm or 2.5% difference.
Audi S6 * Audi S3 * Porsche Cayman GTS
--Former BMW M3 owner