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#1
10-22-2007, 06:04 PM
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Pressure for larger tires.
I have 265/75/16 BFG A/T's. The sticker in the driver's door says 35 psi for the stock 235/75/16's. I have been running my tires at 35 psi since I bought them, but have recently noticed that the center is starting to wear quicker, indicating over inflation. From what I have found, bigger tires require a lower pressure.
Anyone running similar tires, and at what pressure?
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2002 1500 Ext. Cab 4.8L 2wd. K&N FIPK, Cat Back Exhaust, Rancho RSX Shocks, Silverstar Headlights High & Low, Infinity Reference Door Speakers & 10" Dual Voice Coil Sub. 265/75/16 BFG AT/KO's, Spray-In Bed Liner, Hella FF75 Fog Lights, Hella FF75 Driving Lights. 
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#2
10-23-2007, 12:17 AM
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Re: Pressure for larger tires.
Discount tire told me 40 for my 245/75 16's
I ran my last set @ 36 and the outsides wore faster than the center; so I've been @ 40 and I've been happy so far.
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#3
10-24-2007, 08:56 AM
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Re: Pressure for larger tires.
The tire itself will tell you the recommended tire preasure.
__________________
  2000 Silverado Z71, 5.3L, K&N GenII Air Intake, Y-pipe Exhaust (no muffler), Bosch Platnium +4 plugs, 242k miles and still running.
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#4
10-24-2007, 10:10 AM
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Re: Pressure for larger tires.
There's an easy check for this that will get you close to the right pressure. Take your truck to where you can drive straight for about 50 yards. Mark a tire or tires with a marking pencil or chalk, perpendicular across the tread.
Now drive the truck straight for a short distance, when you stop examine the marks for how they wore. If you still have marks on the outside, you're overinflated; mark in the center, underinflated; marks gone, tire pressure good.
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#5
10-24-2007, 10:11 AM
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Re: Pressure for larger tires.
My Bridgestone tires say max of 44psi on the side but that is when you carry a full load. The tire guy says to run no less then 35psi in them when lightly loaded.
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#6
10-24-2007, 10:14 AM
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Re: Pressure for larger tires.
Yeah the pressure on the tire is the max pressure, not necessarily the reccomended. Thanks for the chalk tip, I will try that.
__________________
2002 1500 Ext. Cab 4.8L 2wd. K&N FIPK, Cat Back Exhaust, Rancho RSX Shocks, Silverstar Headlights High & Low, Infinity Reference Door Speakers & 10" Dual Voice Coil Sub. 265/75/16 BFG AT/KO's, Spray-In Bed Liner, Hella FF75 Fog Lights, Hella FF75 Driving Lights.
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#7
10-24-2007, 06:51 PM
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Re: Pressure for larger tires.
I found that the max tire pressure is designed for max weight load of the tire. The Bridgestone Duellers that came from the factory on my truck had a max of 44psi with a recommended pressure of 35psi. The tires max load was 2535 at 44psi, and the new tires have a max load of 3195 at 65psi. I calculated the tires daily average load by dividing 2195 by 44 and multiplied the result by the manufacturers recomendation of 35 and get 2016 pounds. For the larger tire, calculate the same at 3195/65=49.15 x (?) = 2016 or 2016/49.15=41psi.
__________________
 2006 Silverado Z71 - Blue Granite 2003 Monte Carlo Brickyard 400 Pace Car 1987 Camaro IROC-Z - 13k original miles
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#8
10-24-2007, 07:54 PM
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Re: Pressure for larger tires.
The 25k mile '05 that I just got has P265/70R17 Bridgestone Duellers on it and the previous owner didn't rotate the tires so the dealership put the uneven front tires on the back and the truck has a wiggle to it. Are these tires any good? Should I buy two back tires and be done with it or are there better tires out there I should get a set of?
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#9
10-25-2007, 11:36 AM
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Re: Pressure for larger tires.
Those are ok, but I think you will find BFG's are better.
__________________
2000 Silverado Z71, 5.3L, K&N GenII Air Intake, Y-pipe Exhaust (no muffler), Bosch Platnium +4 plugs, 242k miles and still running.
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