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2Addicts | BMW 2-Series forum Technical Topics B58 (M240i) Engine, Transmission, Exhaust, Tuning widest tire that will fit on my setup

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      03-24-2020, 01:11 PM   #1
lixiang7349
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widest tire that will fit on my setup

Guys, Help needed.
I got a set of 18 x 8.5" ET35 (square) rims fitted with 235/40/18 4s tires.
I was told only 225/40/18 would fit but I went with 235 ones and they fit so I wonder where the line is.
Would 245/40/18 fit? I have stock suspension.
Is there a calculation that can tell me for sure?
How can I tell the margin I have for my current setup?
Do I turn my wheels and watch somewhere to see current margin?
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      03-24-2020, 05:14 PM   #2
230iZTR
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By measuring! I swear I spent half the winter on the ground in the garage with a bunch of rulers and squares, calculating and recalculating a super aggressive fitment on 17x9 with 255/40/17 tires. I'm cambered and rolled with a 1" drop so there was no tried and true fitment to copy.

Heres a website I found useful:
http://www.42draftdesigns.com/wheel-offset-101/
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      03-24-2020, 05:56 PM   #3
lixiang7349
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Quote:
Originally Posted by 230iZTR View Post
By measuring! I swear I spent half the winter on the ground in the garage with a bunch of rulers and squares, calculating and recalculating a super aggressive fitment on 17x9 with 255/40/17 tires. I'm cambered and rolled with a 1" drop so there was no tried and true fitment to copy.

Heres a website I found useful:
http://www.42draftdesigns.com/wheel-offset-101/
Thanks for the reply. I read another forum and the answer is clearly no.
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      03-25-2020, 03:56 PM   #4
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https://support.apexraceparts.com/hc...-Fitment-Guide
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      03-26-2020, 05:02 PM   #5
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Probably will fit on the fronts with some fender rolling. I have 245's on 8J ET40, with M4 arms which push the wheel out a good 12-15mm at the top. It's tight, but works.

The rear will cause rubbing I think. I have some room to fit lower ET, but probably not the extra 11.4mm an 8.5J ET35 will bring.
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