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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Tracking / Racing / Autocrossing > Et42 vs et 31
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      11-26-2020, 05:52 PM   #1
Brotherhef
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Et42 vs et 31

Can anyone tell me why most track wheels are et42 instead of et30? I like the concave look, but wasn't sure if there are benefits to et42 or downsides to et30 for track purposes.
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      11-28-2020, 09:46 PM   #2
brigade24
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easier to deal with fitment on et42...ultimately allowing the widest possible tire to fit in the wheel well.

I agree that the et31 looks better, more aggressive...
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      11-28-2020, 10:51 PM   #3
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Quote:
Originally Posted by brigade24 View Post
easier to deal with fitment on et42...ultimately allowing the widest possible tire to fit in the wheel well.

I agree that the et31 looks better, more aggressive...
You think 245 rubber on a 9" et30 be a concern of rubbing during super hard corner since it would sit more flush under the fender? I don't think it would be, but wanted to check.
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      12-09-2020, 05:19 PM   #4
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Quote:
Originally Posted by Brotherhef View Post
You think 245 rubber on a 9" et30 be a concern of rubbing during super hard corner since it would sit more flush under the fender? I don't think it would be, but wanted to check.
no it won't rub. the stock wheels are 225 on 8" and there's boatload of clearance. Ive raced on a 245 and there was zero rubbing...keep in mind I was on coilovers so stiffness helps. i also ran a lower aspect ratio to help with clearance but it was never an issue.

I ran a 255 on stock suspension and there was no rubbing there either. i used a 34et wheel with 3mm spacers all round and there was no rubbing.

if your suspension setup allows, I would consider running a 255 with et30 assuming you have provisions to adjust camber, especially in the front.
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