Larger wheels do typically give a firmer "bumpier" ride. Typically, the overall tire diameter stays the same, the center wheel diameter is what grows to 17 or 18". Thus, the tire sidewall gets shorter and stiffer than say a 16". Also, there is less air inside the tire to help absorb bumps in the road. On the other hand, it looks great and improves road handling due to the tire flexing less on turns.Dave/Swordfish/Gangsta
. I also remember reading somewhere that wnen Chicagos are selected then they dont lower the car by 15mm in the sport pack as they do for 17" wheels, is this correct?
As far as I undestand it doesnt matter what diameter wheel you have the tyres change profile so the overall diameter stays the same so your lowered suspension is still lowered even with 18" wheels. Some folks say that the lower profile tyre on the 18" wheel means a bumpier ride buts its all personal preference.