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E85 3.0 Max Wheel Width Without Mod

Posted: Tue Sep 26, 2023 8:54 pm
by Jstilley
Recently acquired a 2003 Z4 E85 3.0. I currently have stock wheels F8x18/R8.5x18

I'm looking to add wider rear wheels up to 9.5x18 but don't quite understand what offset I would need.

I'll likely keep the front wheels at the stock size or go up to 8.5x18

What is the maximum tire size I can go up to withiut modification? I'm trying to just order wheels with tires installed and throw them on.

Any insight would be appreciated so I don't have to go back and forth with shipping and returning.

E85 3.0 Max Wheel Width Without Mod

Posted: Tue Sep 26, 2023 8:58 pm
by Mr Tidy
The E85/86 shells are all the same size so 9.5" rears should be OK. My MC came with CSL Reps that were 9.5J on the rear and they didn't rub, although Ms have different offsets (ET, or IS in BMW speak).

This site may be useful:- https://www.willtheyfit.com/

E85 3.0 Max Wheel Width Without Mod

Posted: Tue Sep 26, 2023 10:52 pm
by TheDan
I am in the process of upgrading to track wheels that are 9x17 ET38. I have only got 1 fitted (to the front) at the moment as I bought one to test the fit and check rubbing before buying the other 3. I put a 245/40/17 tyre on the wheel that is fitted and get no rubbing at all with stock suspension.

I think it's just a case of using willtheyfit.com like Mr Tidy said and comparing it to the stock sizes (225/40/18 front and 255/35/18 rear) and not going too crazy.

E85 3.0 Max Wheel Width Without Mod

Posted: Wed Sep 27, 2023 4:35 pm
by j3nks79
I run a 18” 10J on the rear with ET40.
Fits spot on without any rubbing

E85 3.0 Max Wheel Width Without Mod

Posted: Wed Sep 27, 2023 10:08 pm
by 1536Z4
j3nks79 wrote: Wed Sep 27, 2023 4:35 pm I run a 18” 10J on the rear with ET40.
Fits spot on without any rubbing
What size tyre is that with ? and have you changed the fronts ? cheers :thumbsup:

E85 3.0 Max Wheel Width Without Mod

Posted: Wed Sep 27, 2023 10:19 pm
by j3nks79
1536Z4 wrote: Wed Sep 27, 2023 10:08 pm
j3nks79 wrote: Wed Sep 27, 2023 4:35 pm I run a 18” 10J on the rear with ET40.
Fits spot on without any rubbing
What size tyre is that with ? and have you changed the fronts ? cheers :thumbsup:
Rear tyres i run are 255/35/18
Fronts wheels are 8.5J ET35.
Lowered suspension as well.
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AF654630-07FE-475D-B5AB-5E6EFCFA2186.png (839 KiB) Viewed 266 times

E85 3.0 Max Wheel Width Without Mod

Posted: Thu Sep 28, 2023 9:34 am
by 1536Z4
Ok Thanks :thumbsup: