6/25/10 10:31 a.m.

I am looking into upgrading from 225/50/14 hoosier A6's to the 275/35/15's. I am having trouble finding the right wheels that would work for this without having them custom made. I see there are some miata options out there in 15x9's but I dont know what offset would be needed. Using spacers would be ok, anyone have any ideas of what works?


z31maniac Dork
6/25/10 11:30 a.m.

Spacers are touch, because the 6UL wheels in 15x9 would need something like a 35mm spacer to work. I believe you want right around ET0 for a 15x9 on an E30, though I'd have to double check.

So you'd actually need 4x100 -> 4x100 bolt on type adapters.

There are a few threads on r3vlimited.com and e30tech.com if you're willing ot search around a bit.

mndsm HalfDork
6/25/10 11:52 a.m.

Buy ones over offset, say -10 and have em milled down? Might actually be easier that way.

Ian F
Ian F Dork
6/25/10 12:05 p.m.

This thread may give you some ideas:


(nutshell: he converted to E36 5-lug hubs so as to stay within Challenge budget and use some cheap 15x10 wheels he found)

If cost is not a factor, I'd assume you'll have to go with one of the custom wheel vendors.

mw HalfDork
6/25/10 12:34 p.m.

15x8 0 offset Sportmax 002's? They are cheap

2002maniac Reader
6/25/10 2:58 p.m.

15x8 et20 clears the strut perfectly, so you'd need 15x9et7 or 15x10et-5 to have the same clearance.

John Brown
John Brown GRM+ Memberand SuperDork
6/25/10 6:40 p.m.

I am installing 275/40r17 RT615s on a XX XXXXXX with 17x9 Drag DR31 from the Discount Tire. To keep my inner backspacing proper I went from a 17x7.5" +35mm wheel to a 17x9" +17mm wheel I am exactly the same inboard and 1.5" wider outboard.

914Driver GRM+ Memberand SuperDork
6/26/10 8:21 a.m.

Diamond Racing Wheels.

Light, cheap and powdercoated.

z31maniac Dork
6/26/10 11:04 a.m.
2002maniac wrote: 15x8 et20 clears the strut perfectly, so you'd need 15x9et7 or 15x10et-5 to have the same clearance.

True, but some additional clearance will be needed since the 275 is going to bulge a bit on the 9" wheel, right?

pres589 HalfDork
6/26/10 11:45 a.m.

In reply to 914Driver:

I didn't think those were really that light...

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