Will these wheels fit here?

Talk about BMW E28s and the people who own them. Use Tech Talk for tech questions and topics.
Post Reply
bane.oh
Posts: 453
Joined: Feb 14, 2008
Location: Chicago, IL

Will these wheels fit here?

Post by bane.oh »

Could one put a 5x120 et20 7" wide wheel with a center bore for an E28 (72.5mm) on a 5x120 et0-15 with a center bore of 70.3mm? It's a 97 Chevy S10 if anyone cares.

It sounds like a math problem. I guess it kinda is.

Sorry I haven't completely figured out wheels yet.
demetk
Posts: 8433
Joined: Aug 09, 2007
Location: CT, USA

Post by demetk »

Chevy's are 5x120?
Kyle in NO
Posts: 17638
Joined: Feb 12, 2006
Location: Nasty Orleans------> Batten-Rooehjch------>More Souther LA

Post by Kyle in NO »

No, they aren't.
bane.oh
Posts: 453
Joined: Feb 14, 2008
Location: Chicago, IL

Post by bane.oh »

demetk wrote:Chevy's are 5x120?
5x4.75" So basically yeah.
bane.oh
Posts: 453
Joined: Feb 14, 2008
Location: Chicago, IL

Post by bane.oh »

Kyle in NO wrote:No, they aren't.
Whatever, fine 5x120.65
demetk
Posts: 8433
Joined: Aug 09, 2007
Location: CT, USA

Post by demetk »

LOL. That .65" will get you every time. I doubt if you can get them to fit.
rollcentre
Posts: 354
Joined: Nov 30, 2012
Location: Dallas tx

Post by rollcentre »

I have GM "5 on 4-3/4"on my car now. These particular wheels bolt up very well. I am not sure if all GM wheels will work as well, as there technically is a .65 difference in B.C.D.
I opened up the centerbore (by .050 or so?) to work with the BMW hub. Now they are hubcentric. I also did a wheel stud conversion.
Mike W.
Posts: 27980
Joined: Feb 12, 2006
Location: California Whine Country

Post by Mike W. »

I'm a little confused by your offset description, but assuming it's close I'll chime in anyway.

It's heresy, but it'll work. And if you torque them down very slowly and progressively they should be fairly close to hubcentric. Even if they aren't I've seen tires off by more than .065". Check wheel torque regularly at least for a while since the lugs won't be seated properly being offcenter, but it should work. I probably wouldn't do it myself and I'm no purist, my money says it'll work.
jc72
Posts: 712
Joined: Aug 16, 2010
Location: Oakland, CA

Post by jc72 »

I wouldn't but I've seen it done.
tn535i
Posts: 5590
Joined: Jul 14, 2006
Location: Middle Tennessee

Post by tn535i »

It's .65 mm or .025" off and will fit but it's not proper. While most will say BMW wheels are hub centric they are really both hub and bolt centric as a lot of wheels are. I imagine the wheels you are describing are similar and that little bit means it will bolt up but you really should have a special wobble bolt to handle that small difference in the bolt circle diameter.

I would be afraid the BMW bolts would eventually stress and potentially snap the head off. Tightening and loosening will produce a circular bending motion. Studs should fare better but still not right and they will bend, just not rotate and bend.

You should be using wobble bolts or wobble nuts if the BCD is not the same.
djazz
Posts: 2541
Joined: Feb 12, 2006
Location: Foat Wuth, Texas

Post by djazz »

Just what I was thinking.

http://bit.ly/17PjDOM
Mike W.
Posts: 27980
Joined: Feb 12, 2006
Location: California Whine Country

Post by Mike W. »

While I see where you guys are going with the wobble bolts, I think it would make things worse here. It looks like he's got a hub that's ~2MM smaller than the wheel hole so no telling where the wheel would end up in a concentric sense. Or maybe loosely torque it with regular lugs on 3 or 4 spots, tighten the wobble bolts one by one to keep it centered. Then again since BMW doesn't use steel inserts in the aluminum, maybe they would kind of dig their own hole.

Again, I think it would work but I wouldn't do it except for a parts car or storage.
wkohler
Posts: 50939
Joined: Oct 05, 2006
Location: Phönix, Arizona, USA
Contact:

Post by wkohler »

I read somewhere that these trucks came with wheels.
My528e.awesome
Posts: 778
Joined: Feb 08, 2011
Location: Roseville, CA

Post by My528e.awesome »

I can't find the picture right now but I saw a s10 Chevy Blazer running M systems. I left a note on it to see if he would trade or sell the wheels but got no call.
bane.oh
Posts: 453
Joined: Feb 14, 2008
Location: Chicago, IL

Post by bane.oh »

Thanks for the responses guys.

It was for a guy wanting to buy my wheels off CL. I told him it probably wasn't worth the hassle and to just find the correct wheels for his truck.

Cheers.
djazz
Posts: 2541
Joined: Feb 12, 2006
Location: Foat Wuth, Texas

Post by djazz »

Based on my S15 experience, he would have been safe. The vibrations don't start until you get over 80. ;)
Devinder
Posts: 810
Joined: Feb 12, 2006
Location: Berkeley, CA

Post by Devinder »

On the issue of Chevy bolt circle, I've run Chevy wheels on my CS without any problems. Remember that any individual stud or bolt on the circle is only off by half of the difference between BMW and Chevy bolt circles ... Less than 0.013" . Think about radius vs diameter. That's less than the slop in the thread fit and likely similar to the tolerance for machining the bolt circle on wheels and hubs. I wonder what the manufacturing tolerance is on wheels?
wkohler
Posts: 50939
Joined: Oct 05, 2006
Location: Phönix, Arizona, USA
Contact:

Post by wkohler »

17
Post Reply