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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Offsets 30 vs 40



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      01-29-2015, 01:47 AM   #1
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Offsets 30 vs 40

I'm looking at 18x8.5 for the front wheels on my e90xi. What offset will give me the best track performance 30 or 40?
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      01-29-2015, 01:49 AM   #2
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If it matters i want to go 18x10 20 in the rears.
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      01-29-2015, 02:09 AM   #3
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You know 18x10 et20 rear is quite aggressive for Lci. Will need fender work and negative camber and isn't ideal size to use at track. Here is pre-lci with 18x10 et20 your wheel will extend 8mm more http://www.e90post.com/forums/showpo...83&postcount=1

As for the front, don't know which is better at track, but et30 will look better. Infact i would use 10mm spacer with that anyway to match the aggressive rear. Tyres 225/40/18 and 255/35/18.
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      01-29-2015, 10:58 PM   #4
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Quote:
Originally Posted by MonacoBlueE90 View Post
You know 18x10 et20 rear is quite aggressive for Lci. Will need fender work and negative camber and isn't ideal size to use at track. Here is pre-lci with 18x10 et20 your wheel will extend 8mm more http://www.e90post.com/forums/showpo...83&postcount=1

As for the front, don't know which is better at track, but et30 will look better. Infact i would use 10mm spacer with that anyway to match the aggressive rear. Tyres 225/40/18 and 255/35/18.
You sure it's going to be that aggressive? Checkout this setup
http://www.e90post.com/forums/showthread.php?t=817163

I'm thinking of a tire setup of 235/35/18 and 275/30/18

Last edited by J3; 01-29-2015 at 11:25 PM.
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      01-29-2015, 11:17 PM   #5
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I'm realizing those rears would never fit so what about 235/40/18
265/35/18
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      01-30-2015, 02:24 AM   #6
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Quote:
Originally Posted by J3 View Post
You sure it's going to be that aggressive? Checkout this setup
http://www.e90post.com/forums/showthread.php?t=817163

I'm thinking of a tire setup of 235/35/18 and 275/30/18
I didn't mean that it wont fit, because it will. Also the 18x10 et20 will extend 4mm more than the 10.5 et30 and tyre will have less stretch. If you want to fit it with the 265/35/18 it just means more fender work and/or more negative camber. As for front the 18x8.5 et 30 will fit with the 235/40/18 without any issues.
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      02-01-2015, 12:43 PM   #7
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Originally Posted by MonacoBlueE90 View Post
I didn't mean that it wont fit, because it will. Also the 18x10 et20 will extend 4mm more than the 10.5 et30 and tyre will have less stretch. If you want to fit it with the 265/35/18 it just means more fender work and/or more negative camber. As for front the 18x8.5 et 30 will fit with the 235/40/18 without any issues.
Thanks for the assist. I'm think I'm better off going 18x9.5 et25 or perhaps even 35 then
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      02-01-2015, 01:55 PM   #8
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Quote:
Originally Posted by J3 View Post
Thanks for the assist. I'm think I'm better off going 18x9.5 et25 or perhaps even 35 then
Yeah the et25 should fit with just fender roll, maybe some camber depending the tyre size. Here is pre-lci e90 example 9.5 et17 with 225/35/19 the lci with et25 will extend to same point http://www.e90post.com/forums/showthread.php?t=724724.

The et35 will fit without fender roll and look like this http://www.e90post.com/forums/showpo...35&postcount=1.
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      03-13-2015, 11:03 PM   #9
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Do you think 275s could fit on the rears then with et35? Without fender roll.
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      03-13-2015, 11:27 PM   #10
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Do you think 275s could fit on the rears then with et35? Without fender roll.
Most likely needs fender or maybe not because xdrive suspension is high.
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      03-13-2015, 11:43 PM   #11
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I'm dropped on kw v1 - maxed out. Check this guy, he was able to fit 285 with no roll!

http://www.e90post.com/forums/showth...=998494&page=2
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      03-14-2015, 03:30 AM   #12
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I'm dropped on kw v1 - maxed out. Check this guy, he was able to fit 285 with no roll!

http://www.e90post.com/forums/showth...=998494&page=2
Then maybe you can. I wont say 100% sure tho. Also he might have played with camber. I know he says stock camber, but there is many different values that are "stock". It's not big deal if you need to roll a little bit.
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