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      02-29-2008, 01:52 PM   #1
AWD Addict
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Drives: 2008 335xi 6spd Coupe
Join Date: Dec 2007
Location: Boston

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2008 335xi  [0.00]
335xi tire size issue

Okay, I'm modifying my stock 18" wheel/tire setup to be my winter setup.

My stock 189s are staggered, 8.0" front, 8.5" rear.

I'm replacing the stock tires

F 225/40/18R
R 255/35/18R

with

F 225/40/18R
R 245/40/18R


My concern is that my tire manufacturer didn't have the exact measurements for sidewall / width as the stockers and how will that affect the XDrive system.

By my math, the stock setup has basically the exact same sidewall height front to rear (3.546" front versus 3.517" rear), and the new setup will be almost a third of an inch larger (3.546" front versus 3.862" rear) in the rear. Is that a big enough variance to be an issue with xdrive (or anything else?).

Am I getting way to insane in analyzing this? I've already ordered the rubber, so I'm hoping I don't have to change anything.

Thanks in advance all!

Last edited by AWD Addict; 03-02-2008 at 02:42 PM. Reason: incorrect stock wheel widths - corrected