818GS

iTrader: (4)

I am running 255/35/18 in the front on 18x8 wheels and 275/35/18 on 18x8 wheels in the rear. How many psi should the 255's be running? 275's?
This is my daily driver so I don't want it too rough. The tires are W and Y rated.

Hardrvin

Depends less on size and more on the tire and your driving preference. I typically run most tires between 32 and 38 psi.

lexo98

iTrader: (2)

If your trying to calculate it based on the OE wheels you will need to know the load index of the 18's. It will say something like 94w after the tire size

Mike813

iTrader: (5)

On my 18's I keep it at 36 I would keep it at 34 if you have nice roads.

BayAreaLex

32psi typically is what I use.

lunatyk

iTrader: (20)

You should not be putting a 275/35 on a 18x8... I hope that's a typo. I honestly wouldn't even run a 255/35 on an 18x8 either.. 255/35 recommended width is a 8.5"

chicov8

recomended is probably 32psi
i do keep 32-37psi

818GS

iTrader: (4)

HAHA thats not a typo. I gottem to fit

2GSC300

iTrader: (6)

I'd do 34-35psi cold, because it will jump about 2-3psi after you start driving

GS4_Fiend

iTrader: (22)

35-40 depending on the tire MAX psi rating

818GS

iTrader: (4)

The max psi rating is 55psi

2GSC300

iTrader: (6)

Pls don't put in 55psi.

671gs

iTrader: (14)

35-40 psi .....