What is ideal pressure for 18 wheels?

[AJ]

I am betting between 39.5-41 all round lol
Steering weight feels better and the back end is less skippy now it's on 33/31
!

I got around to checking my tyre pressures and I have 36.5/32.5, that's a different combination lol

 

[sixysix]

I got around to checking my tyre pressures and I have 36.5/32.5, that's a different combination lol

Ah so middle of the road lol
I will see how the current 33/31 go, then might try 36/34 just out of curiosity.

 

[phil750]

Checked mine today, only had the car 3 weeks, but the 18s were fitted at the dealers not at the factory, so guessing the inside cap was wrong, it had 32 front and 29 back.

Checked them, the fronts were 38 and back was 29 other was 31.

I have set the fronts to 34 and backs to 31 to see how that goes.


also checked the tyre depths, on the conti sports, and after 6k they are at 6.1mm front and 7.1mm backs.

 

[Suicida1 Zombie]

If yours says 32/29 then stick to that or there abouts. Mine has 33/31 for a light load which is a higher psi than your vehicle because I assume that the diesel lump in my car weighs a bit more.

Just a quick question, Do you have the 184 TDI? I only ask as I am running a 150PS TDI FR with 18's and my cap says F32/R29 with a light load......

 

[sixysix]

Just a quick question, Do you have the 184 TDI? I only ask as I am running a 150PS TDI FR with 18's and my cap says F32/R29 with a light load......

Yes mate, 184 for me
That's another good point, the multi link on the rear might weigh a bit more than the Torsion bar on the 150

 

[Suicida1 Zombie]

Ah right, I was just curious.

 

[phil750]

i have the 180 petrol , with 18 inch and mine also says 32/29 on light loads

 

[cilurnum]

Always inflated my tyres a few PSI higher than the manual. I started doing that ever since my old Astra. The 28 PSI was just too low and I always got sidewall damage. Upped to 32 PSI and problem went away, fuel economy went up and the tyres lasted much, much longer. The garage also started inflating them to that pressure as well.

Depends though. Start off with the recommended and if you start seeing problems then decide to alter. If not don't bother.

 

[phil750]

been running mine on 34/31 and been going well so far, did nice long motorway run 200 miles last week and felt good, good mpg, nice feeling.
Going to leave them at that for time being i think

 

[sixysix]

I felt that the 33/31 I put them to were a little too low so changed them to 35/32 now so will probably be sticking with this