tyre pressure.......?

[david.aka.judas]

can some one let me know what tyre pressure I need to run at for a 225/40/18 please?

I was thinking of 34 is that okay?

[sparky71a]

Yep should be fine,dependent on if your carrying weight,or doing a long drive.
I usually run at 35 front and if loaded for travel 36 rear on 225/45/r17.

[Big Sig]

Rule of thumb is twice the rim size plus 1 or 2 psi. That sive should be in the handbook but tbh I would put at least 36-38 and i would keep an eye out for the tyre wear

[fuzzbomUK]

I have a GSI and the owner manual states 40psi front and rear.. 215/50/17
I thought that was a tad high. any thoughts?

[neverlandandy]

I have a GSI and the owner manual states 40psi front and rear.. 215/50/17
I thought that was a tad high. any thoughts?

i would be running those at about 36psi

[rushy]

I have a GSI and the owner manual states 40psi front and rear.. 215/50/17
I thought that was a tad high. any thoughts?

Yep the heavy V6's have high pressures.

[david.aka.judas]

Yep the heavy V6's have high pressures.

heavy engines - they must know something they designed it...lol

[spoons]

Yep the heavy V6's have high pressures.

On the VXR its 42 psi front and 38 psi rears (235/40/18)

[david.aka.judas]

On the VXR its 42 psi front and 38 psi rears (235/40/18)

so - if I'm running the same size tyres on aftermarket alloys.... is 34psi too low then on a 2.2i direct?

cheers.

[rushy]

I run 36-38 on my 2.2 mate on 17's. Think the pressures are the same for 17's and 18's. The big jump comes at 19's. I tend to run softer on the rear to keep it a bit more docile.