BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
      04-14-2021, 07:01 PM   #1
shawntx
New Member
3
Rep
19
Posts

Drives: BMW 550i
Join Date: Feb 2019
Location: Fort Worth, TX

iTrader: (0)

Garage List
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?
Appreciate 0
      04-14-2021, 08:14 PM   #2
Luftpost
Second Lieutenant
93
Rep
284
Posts

Drives: 2016 650 GC, E39’s, X70, X1
Join Date: Feb 2018
Location: NE Florida

iTrader: (0)

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
Appreciate 0
      04-14-2021, 11:00 PM   #3
shawntx
New Member
3
Rep
19
Posts

Drives: BMW 550i
Join Date: Feb 2019
Location: Fort Worth, TX

iTrader: (0)

Garage List
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.
Appreciate 0
      04-15-2021, 12:23 AM   #4
Bigjule1111
First Lieutenant
36
Rep
313
Posts

Drives: 2014 bmw640gc 2015Mercedes e40
Join Date: Aug 2019
Location: Philly - south Jersey area

iTrader: (0)

I have 245/285 set up on my 2014 640 Xdrive with zero issues
Appreciate 0
      04-15-2021, 06:35 AM   #5
Luftpost
Second Lieutenant
93
Rep
284
Posts

Drives: 2016 650 GC, E39’s, X70, X1
Join Date: Feb 2018
Location: NE Florida

iTrader: (0)

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
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 03:35 PM.




6post.com
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST