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E31 850 CSi and E24 M635 CSi M635 CSi (E24) 1983-89 and 850 CSi (E31) 1992-96. The Ultimate Grand Turismo by BMW M.


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Old 5th May 2012, 01:57   #1
badabing
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help on E24 M6 wheel changeover
I just replaced the 415mm TRX wheels on my 1988 M6 with brand new 16X7.5 ET20 style 5's (E39) from the dealer with hubcentric rings.

However something does not look right. On the front wheels, there is a hair's worth of clearance between the face of the wheel and the brake caliper. Is this how it should be?
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Old 5th May 2012, 15:56   #2
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Style 5's in 16 inch and 7.5 I have never ever seen that speck !

If you have the normal size 17X8 you want be that close to the caliper.

Hope this helps

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Old 6th May 2012, 15:00   #3
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This thread talks about 16" options

1988 M6 wheel/tire help - Bimmerforums - The Ultimate BMW Forum

Still not sure if this is ok or not.
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Old 18th May 2012, 21:47   #4
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I have fitted E39 17x8 and 17x9 Style 32's (with spigot rings of course) to my M635CSi. The fronts have ET20 as well and I have approximately 1mm clearance which hasn't troubled me for the last 3 or 4 thousand miles.

HTH
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Old 25th May 2012, 03:43   #5
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The original 415mm wheels that came on my '85 M635 had an et15. If you had the same ...... then a et20 on your new wheels would be 5mm closer to the brake caliper. However, I think the et 20 should be OK ..... as long as nothing is rubbing.



By r_e_l at 2012-05-24
Last edited by Robert123; 25th May 2012 at 03:49.
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Old 20th November 2012, 11:59   #6
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The offset only defines where the wheel mounts to the hub. Has nothing to do with brake caliper/wheel structure clearance. That is up to the individual design of each wheel. Spacers can help because they move the whole wheel structure away from the brake caliper.

Personaly, I am using 17x8.5" Borbet alloys on my M635, with 235/40/17 rubber on all four corners. NO problems clearing my rotors, but the Borbet are designed with a short front lip, meaning the support structure is out away from the hub and brake calipers.
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Old 20th November 2012, 12:04   #7
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Quote:
Originally Posted by Robert123 View Post
The original 415mm wheels that came on my '85 M635 had an et15. If you had the same ...... then a et20 on your new wheels would be 5mm closer to the brake caliper. However, I think the et 20 should be OK ..... as long as nothing is rubbing.



By r_e_l at 2012-05-24
Are those the original TRX 3 pc BBS wheels that were replaced due to cracking problems in the 80s?
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Old 20th November 2012, 15:15   #8
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Yes, there was a cracking problem and a leaking problem ..... neither of which was experienced with the set that came with my '85 M635.
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Old 15th January 2013, 04:26   #9
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IMO the era of the car looks better with 16".. But that's just my taste.
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Old 2nd February 2013, 10:41   #10
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Quote:
Originally Posted by dhl93449 View Post
Are those the original TRX 3 pc BBS wheels that were replaced due to cracking problems in the 80s?
Yep !!
they are BBS RS007 .
I have them on my M6... it was a really expensive option in France.
but nether had trouble cracking or leaking...
and Michelin 240/45/ZR415 are really expensives also: more or less 450€ each !
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