I need to put snow tires on my Type 162 (Front: 18x8 ET34 225/40 R18) (Rear: 18x8.5 ET37 255/35 R18).
2007 335xi, sport package, 6speed
According to Gary at TireRack I can run 225/40R18 all the way around. While I am sure he is correct and they will fit, will this damage my transfercase?
My thought is that the rear tire will be slightly stretched on the rim causing a difference in diameter between the front and rear wheel.
I'm just going to mount tires on my factory 18" Sport wheels because I have aftermarket wheels for summer or just don't want to buy another set of wheels. Can I use 225/40R18 on all four wheels even though the rear is now 255/35R18?
Yes, you can use 225/40R18 on both the front 8" wheels and the rear 8.5" OE wheels with no problem. This is actually very common to do. Eliminating the stagger in this way works very well for winter and results in better winter traction.