Jimdee
Cary, ,NC
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Hi everyone... I have a 2007 GMC Sierra Classic 3500 Duramax/Allison dually. I recently bought 4 new rear tires, Firestone Transforce HT 215 85R/16, Load Range E. I looked up the load rating for these tires and it's 2,760 lbs per tire. That's 5,520 lbs per side, and over 11,000 lbs total capacity on the rear. Two questions: 1. Is that enough weight-bearing capacity to pull my new Cameo 36FWS (it'll weigh around 16K when loaded), and 2. What's the optimal front and rear inflation pressures while towing? Thanks. Jim
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marvmarcy
Polson, MT, USA
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Did you read the single or dual rating? It will be less in dual configuration. I'm running the same size in Michelin XPS RIBS (on my fiver) and they are rated 2,470# ea in dual configuration and 2,680# single. My pin weighs almost 4,000# and your Cameo would likely be less. I suspect your tires will carry around 10,000# at max pressure. That is probably enough tire for your Cameo's pin weight, but I can't say its not over the truck's ratings.
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christopherglenn
a little over an hour from Yosemite
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the rear axle is rated ~10k, as long as the tires are rated 2500# dual you are limited by the 10k. the axle manufacturer rates them higher, but gm stops at 10k. If the bed is empty (no generator, tool box, fuel tank, etc) 4k min weight is easy, 5k is getting close (gvwr).
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JMTTS
52.1122 N, 106.5625 W
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My rear axle weight with the 5th wheel connected (Pin Weight = 2700#) is only 6550# so I am pretty sure that you will be OK.
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ib516
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Optimum tire pressures are inside driver's door frame.
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kwlincoln
North of Houston, TX
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You are fine, but you did leave off the MOST important factor which is the hitch weight of the trailer. 16K is the GVW of the whole unit.
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ShapeShifter
Buffalo, NY
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ib516 wrote:Optimum tire pressures are inside driver's door frame.
But that only applies to the stock size tires that were on the vehicle when it was delivered. Are these new tires the same size and load range as was originally provided with the vehicle? If not, then those numbers on the door sticker are pretty much useless.
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SoCalDesertRider
SanDiego, CA, USA
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You're fine on tire capacity with pulling your trailer. You'd have to pulling a trailer with a hitch weight of 7000 lbs or more to exceed the rear tire and axle capacity of most late model dually pickups. The springs will be flattened and the truck frame will be sitting on the axle before that happens.
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mowermech
Billings, MT
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ShapeShifter wrote:ib516 wrote:Optimum tire pressures are inside driver's door frame.
But that only applies to the stock size tires that were on the vehicle when it was delivered. Are these new tires the same size and load range as was originally provided with the vehicle? If not, then those numbers on the door sticker are pretty much useless.
Well, maybe...
But it is difficult to argue with success!
I installed one size larger tires on my truck, and went from the stock load range D to Load Range E, and I use the door frame inflation specifications.
After several thousand miles, towing and not towing, the tires are wearing evenly, the ride is nice (for a truck), and I have had only one problem, a front tire broke a belt and had to be replaced, which was covered under the road hazard warranty.
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ShapeShifter
Buffalo, NY
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mowermech wrote:ShapeShifter wrote:ib516 wrote:Optimum tire pressures are inside driver's door frame.
But that only applies to the stock size tires that were on the vehicle when it was delivered. Are these new tires the same size and load range as was originally provided with the vehicle? If not, then those numbers on the door sticker are pretty much useless.
Well, maybe...
But it is difficult to argue with success!
I installed one size larger tires on my truck, and went from the stock load range D to Load Range E, and I use the door frame inflation specifications.
After several thousand miles, towing and not towing, the tires are wearing evenly, the ride is nice (for a truck), and I have had only one problem, a front tire broke a belt and had to be replaced, which was covered under the road hazard warranty.
I never said that the door numbers will never be correct. For any given pressure you pick, you are likely to find many combinations of loading, load rating, and tire size that will use that pressure. But there are many more combinations where that won't be the right pressure.
If you change tire sizes and types, the new tires might be just fine at the old pressure, or they might not. The more drastic the change, the less likely that the old pressure will be appropriate.
My point was simply to state that the "optimum" pressure may change as the tire size changes, and the sticker only applies to the tires identified on the sticker (which is why the sticker always identifies the applicable tires, and doesn't just give a pressure.)
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