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Car: 2008 335i Vert (E93, N54)
Default Ideal Tire Pressure on Wider than Stock Rim/Tires? - 07-05-2019, 03:06 PM

So, I have X1 322 Rims in my car since I bought it.
I've since installed wider tires on the non-E9x Rims and I'm trying to determine ideal tire pressure. (ideally without slide testing or waiting for inner/outer wear of course)

My car is over 4000lbs empty, being convertible (E93).
Stock wheel/tire sizes have a pressure of 33r/36r. (225f/255r)

Current Rimes and Tires:
Fronts: 8.5", 245/35r18
Rears: 9.0", 275/40r18

I'm guessing at 35f/38r, simply based on wider tires have higher pressure to avoid just wearing on the outsides.

Thoughts / Experience / Facts are all welcome!

2008 335i Convertible, E93, N54, A/T (200,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
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THE BEAST's Avatar
Posts: 1,362
Join Date: Apr 2016
Car: 2008 E93
Default 07-05-2019, 03:36 PM

I run 42psi in front and 36 psi in rear. 19s on my E93. Front are Pirelli, rear are ToyoR888r. Its not a set thing, some tires allow 50 psi max, others 45, etc. Sidewall strength, hardness of the rubber, etc will all play a part. Should just look up recommended tire pressure for the tire you are running. FWIW , I ran 75 psi front and 48 psi rear on skinny little 155/80/13 on the lowrider, lol
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