E46Fanatics - View Single Post - 255/40/18 Front 255/35/18 Rear on ZHP Wheels
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Old 12-01-2010, 02:41 PM   #22
Penguin Koolaid
Join Date: Feb 2004
Location: Chitown
Posts: 6,701
My Ride: Inline Six
Originally Posted by MasterC17 View Post
I am proposing that I mount two 255/40/18's on the unmounted ones and put them in the front. Why not 255/35/18's? Because the factory had 40's in the front.

You realize the second number is a ratio of the tire width.

225/40 = 90mm
255/35 = 89.25mm

255/40 = 102mm

That's why. You want to track your car and you don't even know the basics on how to read tire sizes?
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