Need PSI help!

[XS650]

Originally Posted By: meep
Best way to optimize your tire pressure: Per a Porsche factory racing team mechanic years back...

Measure cold.

Drive.

Measure hot.

You need to see a 2 psi difference after driving. If it's greater than 2, ADD pressure. If it's less, reduce.

....

Mike


That just doesn't make sense. He is saying that you should adjust your tire pressure until your tires only warm up 20F when driving. And what about different driving conditions?

 

[SteveSRT8]

Might work for Porsches, but that's WAAAYYYY too general for all vehicles.

 

[mjoekingz28]

Originally Posted By: CapriRacer
Originally Posted By: mjoekingz28
30f/35r


According to Tire Guides, this is incorrect. They list 35 psi front and rear.

mjoekingz28: What is the source of your info?




Just checked the placards and it is 30f/35r.

It seems the extra 5psi is there just in case you do some towing or hauling.

 

[CapriRacer]

Originally Posted By: mjoekingz28
Originally Posted By: CapriRacer
Originally Posted By: mjoekingz28
30f/35r


According to Tire Guides, this is incorrect. They list 35 psi front and rear.

mjoekingz28: What is the source of your info?




Just checked the placards and it is 30f/35r.

It seems the extra 5psi is there just in case you do some towing or hauling.


Thanks. As I have said before, sometimes that book (Tire Guides) is incorrect. The vehicle tire placard should always be consulted. Of the 2, it is most likely to be correct.

- A Word of Caution -

Tire Guides lists no less than 8 combinations of body configurations - with different tire sizes - although GM tends to select 35 psi for the inflation pressure for their standard trucks (and vans), others do not. So, please, do NOT assume that if YOUR truck says something on the vehicle tire placard, other vehicles do too. There are just too many permutations to make that assumption!