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codesx codesx is offline
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Posts: 679
Join Date: Feb 2018
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 (190,000+ km)
Wheels: 322 | Tires: R.275/35r18, F.245/40r18
TUNE: JB4/Trebila | 24 PSI | 100% Meth via dual BM5 | 94 Octane
BMS: JB4, Map 6 | WMI | 5" FMIC | OCC | DCI | Cowel Filters
TMAP: 3.5 barr
xHP Stage 3 (v2.0)
VRSF CP | HKS BOV
RB PCV Valve
NGK 5992 Plugs @ .020

Maintenance:
2018 - A/T Replaced | Plugs | Ign Coils | Walnut Blasting
2019 - Index 12 Injectors | VCG | OFHG & O-rings | Alternator w/ Clutch Pulley | Water Pump & TStat
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