Probably a dumb question, but here goes.. I have a new to me 2006 SR5 DC 4X4 and it has Cooper Discoverer LSX 265/75/16 tires on it. What pressure should they be at?
The sticker on the door says 32 in front and 35 in rear but it refers to 245s not 265s.
any help appreciated.
02-08-2011, 12:53 PM
Ignore the door stickers. They're there for the brainless who never use anything other than the dealer-supplied POS Dunlops. The max PSI is on the tire itself.
A good rule of thumb is to start at 65-70% of max PSI (unloaded) and go from there. You can use the chalk mark trick and/or one of those handheld thermo temperature guns. Read the outside, middle, and inside edges of the tire. They should all match. Too high in the middle? It's too high; air down some. Too high at the edges? They're underpressurized. Add air.
I run the Nitto Terra Grapplers 119Q (load range D) with a max pressure of 65psi. Unloaded, I run the fronts at 44psi and the rears at 42psi. I am thinking of dropping the rears down to 40psi.
02-09-2011, 06:17 AM
Remmy700P - thanks for your help. I will use the handheld thermo to find the right pressure.
I am curious about something; the Tundra manual has various tire combination's listed, the closest to my tires being 265/70/16. In all cases the rear tires are higher inflated than the front and yet you inflate your front tires higher. Is this based on the thermo/chalk tests or something else?
02-09-2011, 12:55 PM
In all cases the rear tires are higher inflated than the front and yet you inflate your front tires higher. Is this based on the thermo/chalk tests or something else?
Yes. The rear axle weight may be anywhere between 500#-1500# less than the front axle weight, so the tire pressure is adjusted accordingly.
If you take on a load, adjust the rear tire pressure as necessary.
02-10-2011, 05:37 AM
thanks Devin (http://www.tundrasolutions.com/forums/members/devinsixtyseven/) - that makes perfect sense.