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      04-21-2017, 01:02 PM   #15
upstate650
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Drives: 2014 650xi Gran Coupe Msport
Join Date: May 2013
Location: The Hinterlands of Upstate NY

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2020 BMW M340xi  [0.00]
Quote:
Originally Posted by ndinh View Post
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"
He's asked the same question and gotten the same responses in multiple threads now.
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2014 BMW 650xi Gran Coupe Msport Black Sapphire Metallic on full black merino leather. 20" M5 343M wheels for summer, 20" 373 wheels for winter with Nokian Hakkapeliitta 8 studded snow tires. M6 CP exhaust with M6 Diffuser and ///M Performance carbon fiber finisher. Mission Performance stage 1.5 and transmission tune.
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