What tyre pressure would you use??

DominicI · Post by **DominicI** » Mon Mar 04, 2013 7:27 am

Hi, just picked up my 09 caddy which has 225/40/18 on 18" Audi rims, I know these tyre's off tern look like there flat, but what pressure would you use?? Not much kit in the back so mostly running empty.

Dominic

Post by **Banditbarron** » Mon Mar 04, 2013 8:18 am

Go off what the original pressure should be according to the data plaque

Either in petrol flap or door opening

Dave

Post by **Doc** » Mon Mar 04, 2013 8:32 am

There is no need to change from the labeled pressures on the door post. I've run them on 225/40/R18 for 37,000 miles and they are spot on IMO.
After 37,000 the fronts measured 2.0-1.6-2.0 (outside-centre-inside) and rears 5.0-5.0-5.0.
Fronts were maybe slightly over inflated but over 37,000 your talking 0.1 or 0.2 PSI.
60% motorway driving with 100-130kg in the back.

DominicI · Post by **DominicI** » Mon Mar 04, 2013 8:48 am

Thanks for that, they were very low. The plate gives a range of 30-36 for the front and 35-41 for the rear obviously on much narrower tyres ith higher profile and smaller wheels. I've gone for 32 at the front and 36 at the rear. Anyone think I should lower or higher it let me know.

Dominic

dooka · Post by **dooka** » Mon Mar 04, 2013 10:17 am

Doc wrote: 60% motorway driving with 100-130kg in the back.

Now, that is a lot of shrooms

..

Post by **Doc** » Mon Mar 04, 2013 11:17 am

30-35 front
36-41 rear
Just measured mine and they are 30/30 front 35.5/35.5 rear.
Maybe a little under inflated on the rear but with even wear I'm not complaining.

Neo · Post by **Neo** » Mon Mar 04, 2013 11:24 am

I tend to go with 34 front and 36 on the rear

D4RK1 · Post by **D4RK1** » Mon Mar 04, 2013 12:26 pm

It depends on the tyre size and profile. I run 40psi on the fronts which are 225/35/19
A friends rs6 runs 275/30/20 and they run 50psi. Much bigger and heavier car I know. A scirocco on standard 18's runs 40psi too.

Post by **Doc** » Mon Mar 04, 2013 1:20 pm

Interesting, what's your wear pattern like running 40psi. As you can see I did 37,000 miles at 30psi with only 0.4mm extra wear in the centre, showing I was over inflated at 30psi.

stu0468 · Post by **stu0468** » Mon Mar 04, 2013 1:33 pm

I run 38 - 40 psi in my 215 and 225/35/19. cats eyes are too painful any less. my fronts wear on the inside edge as the cambers way out.

D4RK1 · Post by **D4RK1** » Mon Mar 04, 2013 3:19 pm

Doc wrote:Interesting, what's your wear pattern like running 40psi. As you can see I did 37,000 miles at 30psi with only 0.4mm extra wear in the centre, showing I was over inflated at 30psi.

Ill get some tread depth measurements and let you know skipper. From the naked eye they look perfectly even.

DominicI · Post by **DominicI** » Sun Mar 10, 2013 12:40 pm

Sounds like I'm in the ball park. Will keep and eye on it!!

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What tyre pressure would you use??

What tyre pressure would you use??

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