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      08-08-2018, 06:06 AM   #3
Aufwuchs
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Drives: 2015 M235i RWD 6MT
Join Date: Aug 2018
Location: Houston, TX

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Quote:
Originally Posted by hwntime View Post
The overall diameter of the 45's will be slightly taller than the 40's.

225/40 = 25.09"
225/45 = 25.97"

So there is a 0.89" difference in height equaling 3.5% unless the dealer recalibrated your speedo which I doubt. If you're driving 60mph, your actual speed with the taller tire will be 62.12mph. No concern really.
Thank you! Maybe it will provide extra cushion for our notorious potholes.
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