Originally Posted by skierman64
There shouldn't be a difference between 18s, 19s, and 20s on ride height assuming the proper size tires are being used.
Most of 20 tire setups have bigger overall diameter.
I think because most of 20" wheels for M3 application are 9-9.5F and 10-11R. So people tend to go with 255/30, 285/30 (245/30F, 265/30R will be pretty stretch look) and those setups have bigger overall diameters than our stock 18/19 tire diameters.