Originally Posted by simianspeedster
What's up Mikal?
Could you please elaborate on your comment about 17s helping with gearing and making the car feel quicker?
I recognize that a lighter wheel/tire combo will reduce the effort required to get rolling and the reduced unsprung mass has many benefits, but I'm not clear how wheel size affects gearing and quickness.
Assuming a constant tire diameter and combined wheel/tire weight, is there some other performance advantage to 17" rims that I'm missing?
Regarding the suspension, I'm planning to order the "factory" Performance Suspension (which I understand is installed at the port) because I want to keep it simple and keep BMW on the hook for everything.
You are 100% correct. Assuming one does not change the overall rolling diameter, you will see no performance increase from going with a 17" wheel over 18" wheel, assuming weights dont differ drastically. Rotating mass is rotating mass. Its all still centered around the axle.
I like the BMW performance suspension also, i plan on getting the setup soon.