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      04-14-2021, 07:01 PM   #1
shawntx
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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?
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      04-14-2021, 08:14 PM   #2
Luftpost
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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
shawntx
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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, 12:23 AM   #4
Bigjule1111
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I have 245/285 set up on my 2014 640 Xdrive with zero issues
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      04-15-2021, 06:35 AM   #5
Luftpost
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Quote:
Originally Posted by shawntx View Post
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.
Sorry, I miss read it. My brain saw 255/275.

L
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