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-   -   275 45 20s on style 87 (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/92476-275-45-20s-style-87-a.html)

kashmir 05-08-2013 01:47 PM

3 Attachment(s)
here are some pics

kashmir 05-08-2013 01:52 PM

1 Attachment(s)
one more

racingbmwm3 05-08-2013 01:54 PM

Looks like the larger wheels don't have any rim protection from the tires, otherwise it looks great.:thumbup:

kashmir 05-08-2013 02:19 PM

they look fine...i more concerned about safety and potential risk to transfer case.

Quote:

Originally Posted by racingbmwm3 (Post 935864)
Looks like the larger wheels don't have any rim protection from the tires, otherwise it looks great.:thumbup:


racingbmwm3 05-08-2013 02:24 PM

wasn't it agreed early in this thread that your transfer case is safe and the only problem with that setup is the looks aren't as good as having 315's on the wide wheels?

kashmir 05-08-2013 03:35 PM

the difference in tire sizes is around 3.7% which is greater than recommended +/- 3%..

Quote:

Originally Posted by racingbmwm3 (Post 935869)
wasn't it agreed early in this thread that your transfer case is safe and the only problem with that setup is the looks 't as good as having 315's on the wide wheels?


racingbmwm3 05-08-2013 03:39 PM

oh, I see the confusion now. No, that 3% rule is for differences in sizes from front to rear. Since all 4 tires are the same size there is 0% difference. Basically, the goal is to have the front wheels spinning at the same RPM as the rear wheels to prevent the transfer case from overheating due to constant slip.

kashmir 05-08-2013 04:18 PM

ok....thanks for clarification... i am a total noob as far as cars go!!

Quote:

Originally Posted by racingbmwm3 (Post 935884)
oh, I see the confusion now. No, that 3% rule is for differences in sizes from front to rear. Since all 4 tires are the same size there is 0% difference. Basically, the goal is to have the front wheels spinning at the same RPM as the rear wheels to prevent the transfer case from overheating due to constant slip.


racingbmwm3 05-09-2013 12:31 PM

your welcome! things like this are definitely worth asking about!

Clockwork 05-09-2013 02:56 PM

a lot of aftermarket wheels are sold as 9.5" wide for all 4 corners, so thats a dead give away. Chances are the orig owner bought the 4 aftermarket wheels and put the proper tires on them. He just never bought the staggered wheels so no need for larger width tires in the rear for this set up. I'd vote for the wheels all to be the 9.5" widths.


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