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Discussion Starter · #1 ·
When i had my 33x12.5x15s mounted the tire man said that since i was using 15x8's instead of 15x10's that I should use 30psi instead of the tire recomendation of 35psi. Should i leave it or go ahead and air them up to 35?
 

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With 35PSI in my 33x12.50s on 15x10s, there was too much of a crown for my liking. I dropped down to 30PSI all the way around and the tires are doing well, mileage is very acceptable.
 

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Discussion Starter · #4 ·
Rob said:
I would run them at 35. What's the temperature like in your area?
Im in AL, usually warmer here. Right now it is 50-65.
 

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Nelium said:
When i had my 33x12.5x15s mounted the tire man said that since i was using 15x8's instead of 15x10's that I should use 30psi instead of the tire recomendation of 35psi. Should i leave it or go ahead and air them up to 35?
Usually you can pick up recommended tire pressures from the inside of the door of the vehicle; they usually have a pretty wide range of tire sizes(especially most of the Toys I have seen) Also, the number on the sidewall is recommended MAX pressure. On most Tacos for street driving the base recommendations are usually between 28 and 30 psi for the front and 26 to 28 for the rear...With heavy tires, alot of times you can get away with slightly lower numbers if you want to save wear on your spine :)

If you want to get really specific there is a formula that works pretty well across the board even though I learned it racing motorcycles....

you will need a digital gauge and basic math skills for this...

Set your tires at a cold pressure, say 30 psi. Drive around for 15-30 minutes until you get the tires warmed up. Immediately take the tire pressure after stopping. You should have very close to a 10% rise in air pressure. If it's higher there's too little cold pressure, if it's significantly lower or nil you have too high a cold pressure. Play this little game until you have gotten as close to 10% as possible...
 

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just take some chalk and draw a line across the width of each tire...drive around a little and see where the chalk is worn off, and adjust the pressure until it's even
 

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On the door of my '04 dcab is says they should be at 26 pounds for the 265 70 16. Mine were at 35 pounds. I dropped them all down to 28 and they seem to ride alot better.
 

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Everybody wants to put 35 lbs in the stock 265/70s for some strange reason, even though right in the door jab is says 26. I get the oil changed, the monkeys jack up the pressure. I get the tires rotated, they jack up the pressure. I can IMMEDIATELY tell a difference in ride quality, and I have to let air at as soon as I get home, and the tires have cooled off.

I have noticed that tire shops seem to like to over inflate tires. EVERY SINGLE time I go to one, with ANY vehicle the always over inflate them. They put 40 in the Firebird, when it calls for 30. They over did my mom's Durango, they over did my commuter. And this is several different places, in 2 states... I expect it from Jiffy Lube monkeys, but NOT from a tire shop.
 

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I emailed BFG when i got my BGF 275/70 16 AT KOs to find out the right tire pressure and they said the Toyota Tacoma Double Cab 4x4 should have 40 psi in the tires. I emailed back the fact the Rugged Trails that came with my TRD are supposed to have 26 psi. They emailed me and said for the axel weights and such, 40 psi is what they recommend. My truck with the stiff TRD suspension would have the comfort of a tank with that pressure and the new, much stiffer, tire.
 
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