Whats a good tire pressure combo...

[raggdoll]

...for both towing and not towing.

Currently I run 65 front and 80 rear per spec, but unloaded this truck rides pretty rough.

I was thinking of going 50 front and 60 rear for everyday use and then bumping back up to spec when towing.

Or can anyone suggest a tire pressure I could run front and back both towing and not towing?

FYI my truck is a 21 3500 SRW, and when towing the trailer weighs about 12,000#'s

 

[jadmt]

this will give you the information you seek grasshopper.

Find the Correct Tire Inflation Pressure

These Load and Inflation Tables are intended to provide assistance when replacing tires with optional tire sizes including “plus sizes.”

www.toyotires.com

 

[jadmt]

for the record when you are unloaded you should run less in the back than in the the front as the back axle weight empty is not nearly as much as the front due to the engine. go to a catscale and weigh and see what you weigh. I have a GFC camper that weights around 400-500lb and this is what I weighed.

 

[raggdoll]

for the record when you are unloaded you should run less in the back than in the the front as the back axle weight empty is not nearly as much as the front due to the engine. go to a catscale and weigh and see what you weigh. I have a GFC camper that weights around 400-500lb and this is what I weighed.

How do you do that, you go on the scales with the front only, get a reading, then go on with the back only and get a second reading? I've not done this before...

 

[raggdoll]

this will give you the information you seek grasshopper.

Find the Correct Tire Inflation Pressure

These Load and Inflation Tables are intended to provide assistance when replacing tires with optional tire sizes including “plus sizes.”

www.toyotires.com

Thanks, pretty impressive looking data, but I'm not smart enough to figure out out to compute the information?

Anyone with real world experience and what PSI do you find works for you?

 

[jadmt]

How do you do that, you go on the scales with the front only, get a reading, then go on with the back only and get a second reading? I've not done this before...

no, you just drive on the scale it weighs you front, rear and total. very simple cost $12.50 impossible to mess it up.

 

[jadmt]

Thanks, pretty impressive looking data, but I'm not smart enough to figure out out to compute the information?

Anyone with real world experience and what PSI do you find works for you?

there is very little to compute. look up your tire size use the lowest psi that will support the weight of your axle. remember you have 2 tires per axle so if at 30psi your tire supports 2250 times that times 2 so at 30 psi your tries support 4500lb. go weigh your truck and go from there.

 

[Crusty old shellback]

I run 40/35 with BFG 35x12.50 17 tires. Rides nice.
21 PW.

 

[Will_T]

I am also not too scientific about it. I run 65 front and 75 rear when towing. I could reduce that, especially the rear when empty, but I never seem to do it. Even at those pressures when not towing, I have no complaints at all about the ride. Just complaints about the A/C and towing or empty does not seem to impact that. Bad cooling all the time when over 80 degrees outside.

 

[raggdoll]

there is very little to compute. look up your tire size use the lowest psi that will support the weight of your axle. remember you have 2 tires per axle so if at 30psi your tire supports 2250 times that times 2 so at 30 psi your tries support 4500lb. go weigh your truck and go from there.

Still don't quite get it, what would you recommend based on my tires?

 

[jadmt]

Still don't quite get it, what would you recommend based on my tires?

how much is your payload on the other sticker? from that you can get a close estimate of how much your truck weighs ie 11800 ie the gvwr minus payload.

 

[jadmt]

so say your truck weighs 7900lbs full of gas etc and you and your passenger at say 400lb that would be 8300lbs. say your front axle was carrying 60% of your weight ie 4980lbs and your rear 40% ie 3320lb you could safely get away with running 50psi up front and 35psi in back. that is all hypothetical tho on your real weight and weight bias. without weighing it is just a guess.

 

[raggdoll]

how much is your payload on the other sticker? from that you can get a close estimate of how much your truck weighs ie 11800 ie the gvwr minus payload.

My payload is 3900#'s

I weighed my truck today, with me all all my other crap in the box it weighed 8600#'s

I appreciate your help

 

[bamorris2]

My payload is 3900#'s

I weighed my truck today, with me all all my other crap in the box it weighed 8600#'s

I appreciate your help

What was your front axle weight and what was your rear axle weight?


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[raggdoll]

Im in Canada, I just took it to a sand and gravel pit and they weighed it. Dont know anything about weighing front and rear axles?

 

[H3LZSN1P3R]

When empty 60/60 my sticker actually calls for that when loaded or towing i go 60/80

 

[bamorris2]

Im in Canada, I just took it to a sand and gravel pit and they weighed it. Dont know anything about weighing front and rear axles?

At least here in the US, we have CAT scales that big rigs use to weigh their load. They cost about $12 and are open to anyone to use. They give you weights for your steer axle, drive axle, and trailer axles. If you can get those weights, then you can use the load index chart for your tire to determine appropriate inflation pressures.


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[H3LZSN1P3R]

At least here in the US, we have CAT scales that big rigs use to weigh their load. They cost about $12 and are open to anyone to use. They give you weights for your steer axle, drive axle, and trailer axles. If you can get those weights, then you can use the load index chart for your tire to determine appropriate inflation pressures.


Sent from my iPhone using Tapatalk

We have CAT scales too but not as many and cost a bit more

 

[Rockcrawlindude]

I’ll preface this with: I’m extremely lazy

I have tires that are max 4080 lb @ 80psi
My gvwr is 10k and I never exceed
I run 55 psi all around.
That gives me over 11,200 lb tire capacity, a reasonably good ride and I never adjust it when I hook a trailer (~800 tongue) or pull up to a loading dock for supplies

 

[roegs]

Towing our 5th wheel - 55 front / 75 rear

Not towing - 55 front / 40 rear.

Keeps me well within Firestone load table specs.