04-14-2021, 07:01 PM | #1 |
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Is 255/35-20F & 285/30-20R Xdrive ok?
I have a 2015 650i GC Xdrive with factory 373M staggered rims 8.5F and 9.0R
Factory tires are staggered at 245/35-20 Front and 275/30-20 Rear Factory variance of factory staggered wheel/tire setup that I have for my xdrive is: Front: 245/35-20 Diameter = 26.8in Sidewall = 3.4in Revs/mile = 754 Rear: 275/30-20 Diameter = 26.5in Sidewall = 3.2in Revs/mile = 762 Factory difference is 1.1% (contradicts what BMW says at less than 1% for Xdrive) Would it be ok to run the below configuration with xdrive since its an identical difference to my factory 1.1% variance setup above?: Front: 255/35-20 Diameter = 27in Sidewall = 3.5 Revs/mile = 747 Rear: 285/30-20 Diameter = 26.7in Sidewall = 3.4in Revs/mile = 755 And is there any rubbing issues? Ive considered running for more sidewall height for more protection from pot holes (245/40-20F & 275/35-20R) but I think the 1 inch taller diameter would make my GC sit too tall even though it would fill the fender wells more. I know with taller sidewalls and wider width together (255/40-20 & 285-35-20) will not work up front due to top of tire hitting the xdrive front control arm knuckle without a substantial spacer with the 373m wheels. Plus they are just really big and tall tires overall under there and looks odd I would think. If anyone has any pics or has done any of the above or have recommendations please let me know. But I am leaning towards 255/35-20F and 285/30-20R if no xdrive issues since its same 1.1% should be fine right? |
04-14-2021, 08:14 PM | #2 |
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The problem with your 255/285 is that the rears will wear quicker than the fronts. Go back to Willtheyfit and see what that does to your 1.1% if you reduce the diameter of the rears, but leave the front......it gets worse, not better.
I have non runflat 245/285 on mine (Michelin Pilot AS3+). I believe it is .07% if memory serves me correctly. Rides great, looks even better, no issues what so ever. L |
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04-14-2021, 11:00 PM | #3 |
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Luftpost, What's the difference of a 255 285 setup.as opposed to the factory 245 275 configuration. They both have identical differences in revs per min front to rear and the same 1.1% variance. So tire wear in the rear would be the same or am i missing something. Thanks.
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04-15-2021, 06:35 AM | #5 | |
Second Lieutenant
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