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      03-01-2008, 04:19 PM   #5
remmib's Avatar

Drives: 2013 F10 520d M-Sport
Join Date: Feb 2006
Location: Norway

iTrader: (0)

Originally Posted by AWD Addict View Post
Okay, I'm modifying my stock 18" wheel/tire setup to be my winter setup.

My stock 189s are staggered, 8.5" front, 9.5" rear.

I'm replacing the stock tires

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


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!
Wrong, the 189 are 8" front and 8.5" rear. Just go 225/40/18 all around

F10 520d M-Sport Alpine White | HRE P43SC 20x9+20x11 | Michelin PSS 255/35+295/30 | KW V3 Coilover | M5 Front Sway Bar + M550d Rear Sway Bar | 3DDesign Front Lip | BMW M Performance CF Spoiler | BMW M Performance Diffuser | BMW M Performance Black Grills | BMW M Performance Pedals |