correct tire pressure

[yukonxl1500]

I have upgraded to 20" with 305/50 and I dont know what the proper tire pressure should be? I have been using the pressure for my stock 17's of 36 all the way around. It for a yukon xl usually loaded with 2 adult 3 kids and all the gear that goes along with having a baby.

 

[bzbatl]

I believe you should probably run em between 50-55 psi. I'd run on the high end for better mileage.

Shouldn't it say the max rating on the side of the tire?

 

[yukonxl1500]

It does say max rating, but on the doors on all my vehicles it has always stated the proper psi with or with out full load etc.

 

[jey_]

Running them at the Max Rating on the sidewall is usually NOT correct. The pressure listed on the door sticker is what you should start with unless you have a setup that is very different from the stock tire/wheel setup.

 

[wld4x4]

Tire Pressure

I also just changed from 17" to 20" and I played around with the pressure a little bit trying to get the ride back I had with the 17's. I have been running them at 30psi stone cold and they will gain about 3 or 4 lbs when the get warmed up.

The 20's look better but they don't ride like the 17's. I don't care what anyone says.

 

[jey_]

Tires are a part of your suspension system. All other factors being equal, when you change to bigger wheels you decrease the ability to absorb road irregularities, especially going +3 down to a 50-series tire on a heavy Tahoe. Plus you're probably adding unsprung weight with the bigger wheels.

 

[bzbatl]

It does say max rating, but on the doors on all my vehicles it has always stated the proper psi with or with out full load etc.

That's proper psi on the 17" wheels with probably 235/75s.

Check with the shop you got the tire/wheel package from. They should be able to look it up. Chances are it's going to be near what the max rating is on the sidewall.

Also, remember when they tell you the psi, it's COLD. As in: absolutely no miles driven on the tire when you measure it.

Edit: running at the high end of suggested psi is better for gas mileage.

 

[racephan]

I just added 22" rims with 285/45/22 tires...they were set at 50 PSI..I thought it rode to hard, I lowered them to 42...it seams good now...Anyone else running around 40 PSI with 22" ??

 

[greengumby]

If you upgraded the tires to a bigger size why would you still be looking at the info on the doors? the door stickers are only for the stockers..you should be looking on the sidewall of the tire itse'lf for the max psi. Different brands dont usually have the same psi rating