TIRE PRESSURE CONFUSION

[John Jensen]

From what I've read dually and single rear wheel trucks respectively have the same front axle weight ratings. So 60 psi in front tires is correct for both models.

 

[AH64ID]

It was more of a general statement.

Generally speaking far more people run over inflated fronts than underinflated.

 

[gsbrockman]

From what I've read dually and single rear wheel trucks respectively have the same front axle weight ratings. So 60 psi in front tires is correct for both models.

Nope.
Dually trucks run a different tire size than the SRW 3500’s. Different tire sizes have different load ratings at different inflation pressures. The tire load and inflation tables will verify this.

 

[AH64ID]

Nope.
Dually trucks run a different tire size than the SRW 3500’s. Different tire sizes have different load ratings at different inflation pressures. The tire load and inflation tables will verify this.

Correct. The 6K rating on the stock 235/80R17 tires requires 80 psi.

An empty weight of 5200 would only need 65 psi, but many have reported uneven wear due to the DRW adapters.

 

[John Jensen]

I need to clarify my post. The weight on the front axle for my model truck is the same for either a single or a dually at 4960-65 lbs.
And, at 4950-65 lbs the dually front 235/80R17 tires are safe at 60 PSI.

 

[SnoKing]

I need to clarify my post. The weight on the front axle for my model truck is the same for either a single or a dually at 4960-65 lbs.
And, at 4950-65 lbs the dually front 235/80R17 tires are safe at 60 PSI.

However you are not going to like the tire wear and/or wear pattern.

 

[lpennock]

I need to clarify my post. The weight on the front axle for my model truck is the same for either a single or a dually at 4960-65 lbs.
And, at 4950-65 lbs the dually front 235/80R17 tires are safe at 60 PSI.

My 18 DRW had a weight on a CAT scale weight of 5660, almost 600lb heavier than the chart weights you refer too. For that weight the 235/80r17 requires over 70psi (2805) but less than 75 (2940). Extrapolation between the load table numbers puts it at 71 psi required. Using the truck advertised weights is not a good thing when trying to calculate tire pressures.

 

[SnoKing]

The duallies I have driven all seemed front heavy. I agree with Ron, run them at 80 psi and reset toe in to almost 0.

 

[John Jensen]

However you are not going to like the tire wear and/or wear pattern.

My 18 DRW had a weight on a CAT scale weight of 5660, almost 600lb heavier than the chart weights you refer too. For that weight the 235/80r17 requires over 70psi (2805) but less than 75 (2940). Extrapolation between the load table numbers puts it at 71 psi required. Using the truck advertised weights is not a good thing when trying to calculate tire pressures.

I agree. I waited to weigh mine until I installed my shell and had the truck loaded with my normal stuff.

 

[SnoKing]

I agree. I waited to weigh mine until I installed my shell and had the truck loaded with my normal stuff.

They put helium in the front tires?????

 

[John Jensen]

However you are not going to like the tire wear and/or wear pattern.

The post was an example, not what I'm running. However, I've run at 65 PSI front and rear on all of my 1 ton trucks (when not towing) and have never had tire wear or wear pattern problems.

 

[R.Taylor]

I'm running 60F/50R empty on my 3500 SRW and 70F/70R when towing and I'm still on the stock tires.

 

[HPSimpson]

My 3500 80psi front; rear empty 45 psi loaded door plate, The 2500 60psi front empty, rear empty 60psi, loaded door plate.

 

[AH64ID]

My 18 DRW had a weight on a CAT scale weight of 5660, almost 600lb heavier than the chart weights you refer too. For that weight the 235/80r17 requires over 70psi (2805) but less than 75 (2940). Extrapolation between the load table numbers puts it at 71 psi required. Using the truck advertised weights is not a good thing when trying to calculate tire pressures.

It's impressive how far off the chart weight is, but then again it is a base model truck.

My chart weight is 4956/3027 7983 but my scale weight with me in the truck and a 1/2 tank of fuel (the day I bought it) was 5250/3300 8550.

With the new 55 gallon tank, front hitch, wheel to wheel steps, bed liners, bumper step, air compressor, floor mats, etc and me in it the weight is up to 5420/3540 9000. I'm actually surprised that I have only added ~450 lbs to the base weight of the truck.

 

[SnoKing]

My ready to tow weight when we full timed with the 5th wheel was 8900 lbs.

Front 5140
Drivers 3760
Sub Truck 8900

 

[Cummins12V98]

Generally speaking far more people run over inflated fronts than underinflated.

agree to disagree. Simply look around while out shopping.

 

[AH64ID]

agree to disagree. Simply look around while out shopping.

Appearance is deceiving on tires, so I’d never base a broad comment on nothing but appearance.

The tires on my Jeep and wife’s 4Runner always appear under inflated, they aren’t. They are actually slightly higher than they need to be, but not by much.

Take a scale and a tire pressure gauge with you on your shopping trips, you’d likely be surprised.

 

[Cummins12V98]

When using the tables I add 10 to the front and 5 to the rear. Ask GY they will tell you to add 5 for the trailer tires for example.

I have driven over 1,000,000 Miles and get over 100j on my 98 ram easily by proper tire inflation.

front tires turn as in left to right that causes edge wear. That needs to be compensated for.

 

[Timd32]

I got 2 years and 34k out of my factory Firestone Transforce AT's..... I think that was pretty impressive.

Beyond shot at the end.

 

[JR]

Appearance is deceiving on tires, so I’d never base a broad comment on nothing but appearance.

The tires on my Jeep and wife’s 4Runner always appear under inflated, they aren’t. They are actually slightly higher than they need to be, but not by much.

Take a scale and a tire pressure gauge with you on your shopping trips, you’d likely be surprised.

Proper inflation for my wife's car (now my work car) is 28psi. At that pressure they tend to look low at times... It took forever to get her to quit overinflating them