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Old 05-01-2012, 11:48 AM
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quackbury quackbury is offline
///Monkeyazz Duck
Location: Not In Kansas Any More
Join Date: Dec 2005
Posts: 5,247
Mein Auto: 535i; 428 GC; Twin X1's
Originally Posted by Needsdecaf View Post
As long as he used the correct sizing for 20's, then the outside diameter of the tire shouldn't have changed from the 19's.
Outside diameter is one variable. The others are section width and offset. Changes in these can impact fender clearance, particularly at the front with steering at full lock and the suspension is fully compressed.

Overly dramatic example: Assume a RWD 535 with ZSP or ZMP and staggered wheels. Presumably the OD of the rear wheels and the front wheels are close, if not identical. If you slapped the rear wheels on the front axle, I bet you would have a clearance issue.

(Even more dramatic example: try doing ht esame thing with the staggered 20's on my X5D).

Current BMW's:
2016 428 GC MSport
2015 X1 28i xDrive
2015 X1 35i xDrive

Prior BMW's
2014 535i MSport
2014 328i SportWagon
2011 535ix MSport
2011 X5 35D
2008 ///M3 Vert
2008 X5 3.0
2007 X5 3.0
2006 X5 3.0
2006 550iA SP
2003 540iA M-Technic
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