Tire pressure question.

Hey guys just had my Michelin P255/70R18 tires switched from factory steel rims to OEM TRD rims. Door pillar states 30 front, 33 rear. Tire place set them at 47 PSI. I dropped them all to 35 psi. Was I wrong? Tire sidewall states up to 51 PSI.

 

Since these are passenger, C rated tires you're fine at 35. Are you lifted? Might be able to stay at 35 or might want to experiment with ride quality a bit. I have 255/75/17 and a moderate lift with a shell on the back and a hidden winch on the front and keep mine at 34 front and rear. Seems a good mix of gas mileage and comfort. Shop always overinflates.

 

I reset mine at 35 as the ride was a bit hard. I have no idea for the rational that they used to bump it up!

No lift or changes from factory other than swapping OEM wheels.

 

The 51 psi is for hauling a max load for the truck. I run mine at 32 and heat gets psi up to 35 or 36 in warm weather on the road.

 

Google "chalk test". Use the jamb pressures as a starting point and move 1-2 lb. at a time, up or down, based on test results

 

Agreed. If you have OEM size, stick to OEM PSI recommendations for cold. That factors in the heating up of the tires upon normal driving. You may increase your MPG a bit by inflating them further, but you'll start to lose your contact patch with the road and increase wear in the center of the tire. No idea why tire places feel the need to overinflated the shit out of them. Even the Toyota dealership has been filling mine to 40 lately when cold recommended is 30.

 

What are the specs on the oem tire?