tire manufacturers have no idea what rim you are putting their tire on. The pressure on the tire is the point of damage to the tire.


Label reads 80 PSI because of load carrying only. Will a tire at 50 carry a fully loaded truck, yes. But the tire will bulge on the sides. This bulging while the tire spins is what causes heat. Heat increases pressures and fatigue in the tire. When fully loaded and filled to sticker the tire will bulge less and will not heat up as much.


Short answer is if your not carrying any weight it is safe to let the air out. Minute you start putting weight in or trailering you should air up.

 

I agree. The pressure on the tire is the maximum safe pressure for that tire. The manufacture of the tire has no idea the weight of the vehicle that will be resting on that tire. The amount of deformation in the tire, or sidewall bulging is a result of the pounds per square inch pushing down on the pavement creating the necessary contact patch to support the amount of weight being put on that tire by the vehicle. That will be different on every vehicle and in every load, and the tire manufacturer has no way to predict any of that.

My question was more direct to the minimum amount of air pressure necessary in a tire. If a tire the deforms too much, or the side walls bulge, that will cause friction heating the tire potentially weakening the sidewall and possibly even causing a blowout. E Rated Tires has stiffer sidewalls, so theoretically if the pressure was too low and the tire sidewall would begin to support weight as much as the air pressure, putting too much strain on the sidewall

 

This new/used camper I bought came with the temp/pressure monitor. Something I should have had a long time ago. Sunday I'll be using it for the first time, it will be interesting to see the temps! The problem I also have is my air compressor only goes to 120psi and when you try to get above 110 you have to wait for the compressor to kick on and then shortly after it kicks off its back down to 110. You do guys think I should run psi closer to the 125 max? The 5er weights 17K, each tire can carry a little over 4800lbs. and tongue weight is at least 3K. That leaves 14K on four tires, 3,500 per tire.

 

I run 50-70 psi (depending on load) in my 4x8 utility trailer that has an 80psi max...


I would say it depends on the roads you are pulling too....Concrete will heat the tires up quicker and more than asphalt roads...

 

I will say that on 65-70 degree days I rarely saw my motorcycle tires get above 120 degrees....


However on 90 degree+ days it was not uncommon to see my motorcycle tire temps be 180-210 degrees

 

That's a heck of a jump in temps Lee! Its going to be in the low 90° when we take off and 84° in Vegas. From there it goes down to 50°-60°'s to the Black Hills of SD. I have the TST system and in the directions it says that Michelin standards tires typically fail between 180° and 200°.

 

I know, It had me worried for some time. However, motorcycle tires are much stronger and more resistant to failure...plus they take a lot more stress as your contact patch swings from side to side...


I wish I had that technology on all my vehicles but the company that put out the tpms system I had is now out of business....and their sensor were proprietary with the batters built in (not replaceable) so after 3 years the system is useless.


I want to put one in my truck but the systems I have seen for 6+ wheels (expandable to 18) are like $400....

 

I run my E rated tires on my trailer at 70-72lbs. On my truck I run 72 in the rear on both duals and 55-60 in the front. My tires are 265's though.

 

I'm just being a worry wart about flats with my new/used 5er. Hopefully if I have a problem the monitor will catch it before I blow up the side of the 5er!

 

Does the monitor have high/low pressure and high/low temperature warnings?

 

i can see a 150 degree difference in tire tread temp on my kenworth after running 25 miles at 80,000 lbs. scared the crap out of the boss one day when i hit the tread with the infrared and he saw 220 degree tread temps. and the truck was sitting for close to 10 minutes when i "shot" the tires.

 

That's a lot of weight, so it doesn't surprise me that they heat up quick...

 

Yes it does!

 

I would set it and forget it then...unless you get a warning...


I know I was driving myself crazy watching the data on my bike...