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      01-27-2013, 11:51 AM   #23
Just one more taste...

Drives: 2010 135i
Join Date: Aug 2012
Location: Shirley, MA

iTrader: (14)

Originally Posted by simianspeedster View Post
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.