wheel sizes
if you are going to go 17 get OEM AMG wheels, available thru any Craigslist for nothing.
18 looks good but get the right sizing - 8" all the way around or staggered. anything else looks weird.
rjp
Here are the Factory Specs for the C-Class W202 (Wheels & Tire Sizes) based on the manual:
225/45 ZR 17 (7.5Jx17 ET37) Front
245/40 ZR 17 (8.5Jx17 ET30) Rear
225/40 ZR 18 (7.5Jx18 ET37) Front
255/35 ZR 18 (8.5Jx18 ET30) Rear




