[drexplode]

Found some conflicting information and was hoping to get clarification on tire pressure for square setup 225/45-18 Xice3 non-run flat.

Car = 2018 340i (RWD) M-sport.

Front = 34PSI?
Rear = 39PSI?


Wheel/tire combo purchased from TireRack. Thanks in advance.

[sspade]

Originally Posted by drexplode

Found some conflicting information and was hoping to get clarification on tire pressure for square setup 225/45-18 Xice3 non-run flat.

Car = 2018 340i (RWD) M-sport.

Front = 34PSI?
Rear = 39PSI?


Wheel/tire combo purchased from TireRack. Thanks in advance.

What does your door jam placard say?

[jadatis]

Googled the tire and found Loadindex 95 / maxload 690kg/ 1520 lbs AT 42 psi up to 160km/ 99m/h .
If you find GAWR's ( gross axle weight rating) , and give max technical carspeed, I can calculate with the official used formula, the pressure for that, but will most likely be that 34/39 psi

For your normal use and used speed ( and wont go over for even a minute) it can be lower, estimate ( ooh dangerous) 34 all around.

Also check the tires sidewall if my found LI was right and if XL / Reinforced/ extraload.

[B58 parts]

The door is if you're all OE. If you're not, it's a good starting point but it becomes a trial and error exercise to find what feels/performs best.

Tire pressure is a big deal. On the honda, after 3 sets of coilovers and all sorts of suspension tweaks, it was a friggin tire pressure change that finally got the car to handle the way it was supposed to.

I have the pilot alpins 245/40/18 and they seem to like 32/35 cold. Also be aware that heat and centrifugal force (more heat) will increase the pressure, so be aware/consistent with checking hot/cold.

[chowser51]

I’m running 35/41 on my Yoko snow tires.

Oh wait. Never mind me. I swapped to 17s for winter.