05-01-2012, 12:48 PM
Location: Not In Kansas Any More
Join Date: Dec 2005
Mein Auto: 535i M Sport; Twin X1'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.
Originally Posted by Needsdecaf
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.
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).
2014 535i MSport Space / Black, ZCW, ZDA, ZLP, ZLS, ZPP, H-K and 704
2015 X1 28i xDrive Alpine / Black, xLine, ZCW and Ultimate
2015 X1 35i xDrive Black / Black, ZCW, Ultimate and Xenons
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