Correct tire pressure?

[Jvann]

Which tire pressure is correct? The manufacturer's psi which is shown on the data sticker on the cab door or the psi shown on the tire? I have asked several tire dealers and they don't agree. I pull an #11,000 5'er and I would like to get it right. TIA

 

[Jumbo Jet]

Weigh the load. Use this chart - http://www.goodyear.com/rv/pdf/rv_inflation.pdf



Axle Weight / Number of Tires on axle / Max Tire Weight Rating * Max Tire Pressure = Running Tire Pressure



5000 / 2 / 3195 * 80 = 63 psi



6000 / 2 / 3195 * 80 = 75 psi



6390 / 2 / 3195 * 80 = 80 psi

 

[J&LRam]

I pull a 11200 GVWR 5er and use 75 rear and 68 front in my Michelin LT265/70-17" "E" LTX AS. Empty I use 65 front and 45 rear. I use the chalk line method on all my trucks for best tread wear for any given truck/wheel/tire combo. My current orig tires have 59000 and are about 60 percent gone. The data plate is a recommendation only and can be used as a starting point for fine tuning for best tread wear and tire life.

JIM

 

[Grizzly]

Weigh the load. Use this chart - http://www.goodyear.com/rv/pdf/rv_inflation.pdf



Axle Weight / Number of Tires on axle / Max Tire Weight Rating * Max Tire Pressure = Running Tire Pressure



5000 / 2 / 3195 * 80 = 63 psi



6000 / 2 / 3195 * 80 = 75 psi



6390 / 2 / 3195 * 80 = 80 psi

I agree with the chart. Remember when in doubt, It is better to over inflate a little then to under inflate.

 

[Jvann]

Thanks guys. Think I'll use the data plate as a beginning point and over inflate a few PSI. I'll adjust that if necessary after trying it for a while.

 

[SnoKing]

Thanks guys. Think I'll use the data plate as a beginning point and over inflate a few PSI. I'll adjust that if necessary after trying it for a while.

Remember that the door jam plate is for the max axle loads. Weighing the rig and using the inflation chart is the correct way to do it. If I put the 265/75R16's to 80 lbs on the rear of my truck, that is good for 6830 Lbs and axle is only rated to 6084 or two 245 at 80 lbs. SNOKING

 

[Dieselnerd]

Snoking, the axle IS NOT rated for 6084. I don't know where you are getting this information. On the 3rd gens it's basically (except for 1" difference in width) the same as the dually axle. There are no single rear wheel tires that will exceed the capacity of the 11. 5" axle. I don't remember the exact capacity but as I recall it's around 10,000 pounds. The 3rd gen trucks have much stronger axles than the 2nd gen. My Dana 70 on my 2500 2nd gen was rated at 7500 pounds. The door sticker on my '05 says 6300 pounds with 75 pounds of air on my stock 265's.

 

[SMorneau]

I swear by the chart. It really works.

 

[cwsoules]

I use the data on the post. I checked the manufacturer's data also to ensure that my tires are inflated enough to meet the measured load placed upon them. I inflate the trailer tires to the level indicated on the side of the tire. I have not had a problem with my truck tires, but my Goodyear Marathons do not last to be retired due to tire wear. They develop bulges, blow out, or the inner lining comes loose from the inside of the tire. I check the tire inflation pressure daily when towing.

 

[SnoKing]

Snoking, the axle IS NOT rated for 6084. I don't know where you are getting this information. On the 3rd gens it's basically (except for 1" difference in width) the same as the dually axle. There are no single rear wheel tires that will exceed the capacity of the 11. 5" axle. I don't remember the exact capacity but as I recall it's around 10,000 pounds. The 3rd gen trucks have much stronger axles than the 2nd gen. My Dana 70 on my 2500 2nd gen was rated at 7500 pounds. The door sticker on my '05 says 6300 pounds with 75 pounds of air on my stock 265's.

The original poster has a y2k truck and rear GAWR is 6084 lbs. Yes the axles themselves have higher ratings. Dodge put two times the 3042 lb standard 245's on the door jams.



My 2001. 5 SRW one ton (AKA 2500 with camper package and larger tires)came with 265's from the factory, but Dodge still put the same sticker with 245 tires on the door jam. No 2nd gen 2500 has more than 6084 rating on the rear axle.



SNOKING