[jhall1957]

Will 285/35-20 fit on stock wheels for back?

[Squidget]

Originally Posted by jhall1957

Will 285/35-20 fit on stock wheels for back?

The resulting tire diameter difference is 4.5%. That's more than I'd use personally. A good rule of thumb is 3% difference at most.

[aerobod]

Originally Posted by Squidget

The resulting tire diameter difference is 4.5%. That's more than I'd use personally. A good rule of thumb is 3% difference at most.

Also, traditionally BMWs have been about 3 or 4% high on the speedo reading vs actual speed, but our G87 is only reading 1km/h high at 120km/h compared with the GPS reading, so a 4.5% increase in tyre diameter would likely have the speedo under reading by almost 4%.