Tire pressure for 305/65R18 - 33.58 Nitto Ridge grappler

[Mdegen93]

The tire shop set them to 38 psi. What does everyone think my pressures should be set to?

 

[MValdez]

The tire shop did what they were supposed to do which is fill the tires to vehicle's required load specs ( sticker on the driver side inside door panel) I've been running my nitto ridge grapplers 305/55R20 116Q @ 37 psi for over 20,000 miles and tire wear is even and minimal. I rotate them every 5,000 miles.

 

[AnthonyD1978]

As long as the load rating is the same or higher than the previous tire you can set them to the same pressure. As a general rule....

 

[BlckDT]

I just came across this thread for purposes of my own research. I am running 285/60R20 Nitto Ridge Grapplers and the tire shop placed them at 42 PSI. I plan to match it to the load of the vehicle. Thanks @MValdez for your comment....

 

[SilverSurfer15]

Tires and Wheels: How Do They Affect My Ride?

If you're looking for the cliff notes: 17"/18" wheels, 35"-37" tires and inflate them in accordance to THEIR load curve (40-45PSI Front, 35-40PSI Rear), not the factory tire's load curve to which most factory TPMS Systems are set. If you're going to run 20" wheels, stick to 37" MT tires as...

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