Quote:
Originally Posted by Wlodi
Hi,
I have seen one of your old posts. What did you mean by " I went 245/285 because it was recommended". BMW recommends 245/275. On the other hand every caltulator on the web says 245/285 is the perfect match.
Did You have any problems with xdrive and drivetrain on 245/285? I just bought 343M5 wheels and dont know whether I should go for 245/275 or 245/285 setup.
Please help/
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For xdrive, you want the OD of your wheel+tire to be closer to 1% between front vs rear (RWD should be within 3%). So basically, 245/35+285/30 or 255/35+295/30 would be your best choice. Math:
Front: 245 * 35 = 85.75mm > convert to in = 3.38"
Tot OD front = 3.38 * 2 + 20(size of wheel) = 26.76"
Rear: 285 * 30 = 85.5mm = 3.37"
Tot OD rear = 6.74 * 2 + 20 = 26.74"