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[Peter5498]

So I’ve come across this thread: https://www.e90post.com/forums/showthread.php?t=1238288

I’ll be running the exact same setup except on my E93 but I wanted to know if I could bump up the sidewall to 40 instead of 35 on all 4 and still be good with fitment?

[Yotaismygame]

Hmmm you could I suppose. I think they would look a little balloony though. If you went with 245/40s that would be like an in-between step. Compared to a 255/40

[Peter5498]

Here’s a thought - I see a good amount of people running 40 up front and 35 in the back.

225/40/18
255/35/18

I’m sure this works but would it fit well?

[Luis561]

Originally Posted by Peter5498

Here’s a thought - I see a good amount of people running 40 up front and 35 in the back.

225/40/18
255/35/18

I’m sure this works but would it fit well?

Originally Posted by Peter5498

Here's a thought - I see a good amount of people running 40 up front and 35 in the back.

225/40/18
255/35/18

I'm sure this works but would it fit well?

Yea it'll work, that's what I'm running but with 235 in the front

[Luis561]

Originally Posted by Luis561

Yea it'll work, that's what I'm running but with 235 in the front

With 12 mm spacers up front and 15 mm in the back

[Yotaismygame]

Reason to run a 225/235 in a 40 series instead of 35 is because as the tire gets wider the sidewall gets taller.

a 235/40 is .4" taller than a 255/35. If you went with a 235/35 the front tire would be .5" less tall than the rear. Personally I like the look of the square setup in the link you posted.

Since you don't have an Xdrive its really up to you. Use this calculator to compare sizes.

https://tiresize.com/calculator/

Better yet run a 235/40 front with a 265/35 rear. Only .1" difference in diameters. Very common setup on these cars. Should look nice too with 8" & 9.5" wheels.