[Mech Spec]

Originally Posted by alex2364

Try again. BMW has documented 2 mm or less in tread difference, which is less than 1%.

https://g20.bimmerpost.com/forums/sh...19&postcount=4

The OEM specs on at least the M240 ZTK, exceed this diameter recommendation. 5mm difference between 245/35/19 and 255/35/19

I would argue that this is regarding the use of old and new tires together and a CYA to force customers to buy new tires.