Tire Pressure

LookingFor1stTruck · May 16, 2003

I am usually very good at checking my tire pressure at every fill up. Well, I have had my truck 2 weeks now and just checked on my 2nd fill up. The front tires were right at what the sticker on doorsill said, 55 psi. The rears were at 35 psi and the door sill recommends 80 psi. I was a bit nervous putting them to 80 psi. Is it safe to do so? They are the stock tires. Thanks.

John

GF7PE · May 17, 2003

That tire pressure is ideal for even tire wear on a set of 245's. The 80 psi is for max load. Dont bother adding more air untill you are going to load it up.

Mortgage Paul · May 17, 2003

even with the rears at 55 LBs they bounce all over if you hit a chuck hole empty. I run the rears at 40 Lbs empty.

Shaners · May 18, 2003

I agree... 80 psi is "MAX", and only intended for "maximum" situations.

Dihappy · May 18, 2003

what kinda vehicle are you driving?

My psi is 30 front/ 29 rear.

Bob G. · May 19, 2003

My door sticker says 50psi for front and 80psi for rear. I am no where near the 2800lb payload even with the boat/trailer tongue weight so I run mine at 50psi all around.

Bob G.

'02 HD · May 19, 2003

I run 50 psi all around my '02 2500HD CrewCab.

NascarFan · May 21, 2003

Well, I'm running the recommended pressure 55/80. Probably stupid, but the owners manual made a big fuss about their recommended tire pressure. Yes, it will jar your fillings loose. I've thought several times about lowering psi, but I just wasn't sure what to use. In particular, I was wondering if it was important to maintain the recommended proportion of psi (i.e. 55/80=.6875). Will be following this topic for more recommendations.

Shaners · May 21, 2003

I run 50 and 50 psi frt/rr in my HD crewcab.

NascarFan, You should be comfortable running 55/50 in your truck without any problems. 80 psi in the rear tires of an unladen truck, will quickly wear the centers right out of the tires. 55 psi in the front will help with the extra weight of the 8.1L/Ally combo you have.

BlackSilver · May 21, 2003

I run 50 front, 60 rear. Usually I'm towing a 5th wheel with about 1400# pin weight (8000# GVWR), and sometimes a boat behind that.

Tire wear after 12,000 miles looks normal all around.

mfontana · May 26, 2003

When a tire is designed, the maximum capacity of that tire is calculated at max inflation and max deflection or weight. If you inflate for max capacity, with a non-max load, your tire is crowned and you are only riding on a small part of the center of the tread. This is dangerous. Inflate acording to your usuage and load. To demonstrate this go to an empty parking lot and lock up the tires. If you don't have anti-lock, you will see how narrow the skid pattern is as compared to the tread width when you overinflate. My 2500 HD rode much better empty, especially over expansion strips after I installed the "Velvet Ride" schackles.