Article on 80' p.s.i. max in tires what do you think?

mattbnr · Sep 23, 2014

not4hire said: ↑

There is no contradiction between the two articles. None. The first article states, and rightly so, that the people who build the tires are well-acquainted with their purpose and use and have a table of recommended inflation pressures based on such parameters. The second article says to not run the tires less than the recommended inflation pressure. The number on the tire sidewall is not the recommended inflation pressure, it is the maximum cold inflation pressure. A tire inflated to the recommended pressure is, in fact, a fully inflated tire. Anything over that is an over-inflated tire.
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Recommended according to what? Psi? Load weight? Right now I run all tires at 100 psi. Is that under inflated? Over? Just right? I'm hauling 46000 in the tank. Grossing 76xxx.

Skate-Board · Sep 23, 2014

If you look at the load chart link I posted you can see the load limits and pressure required. A fully loaded truck at 80k can have tires well below 100psi

Skate-Board · Sep 23, 2014

According to the chart with my 24.5 tires I can inflate to 70psi and carry 18,640 on each pair of drive tires. The only time I've seen tires blow is when they went flat from a nail while under a load, got it fixed then it blew. Once a tire goes flat you have ruined the sidewall and it's only a matter of time before it goes.

Richter · Sep 23, 2014

wel if you guys want to wreck you tires because of an incorrect artical...go right ahead. tzire charts are for optimal conditions...not actual driving conditions.

heavyhaulerss · Sep 24, 2014

I was just thinking, a tire at 70 or even 85 lbs, would not the tires on a tandem be rubbing each other? when 1 of mine is low it is real close to the tire next to it. my weight varies, 80,000 gross 180 miles, then dead head sometimes 60 miles, then 70,000 gross, then the next day, 55,000 gross, so should I inflate & deflate every time I load/unload ? I have my tire p.s.i. based on my max weight of 80,000 I looked at the tables, & according to it, I could run a lot lower p.s.i. even at max wt, but I just feel very uncomfortable looking at any of my tires with that low of air pressure.

heavyhaulerss · Sep 24, 2014

4x4_Welder said: ↑

Here's another article on the same site arguing against running your tires low:
http://www.truckinginfo.com/channel...ssue-they-can-affect-your-safety-profile.aspx
I think this is a case of "just because you can doesn't mean you should". There are a few solid reasons to not run your tires that low:
Rolling resistance. A tire with lower inflation will deform more, causing more of the tire to be in contact with the road. This increased deformation will take more energy to keep going, using more fuel than a fully inflated tire. Think of it like riding a bike or pushing a hand truck with partially inflated tires- They may have enough inflation to not fail, but it's still much more difficult.
Reduced tire life. This additional flexing creates additional heat. This may not cause the tire to fail early on, but towards the end of the tread life the miles of extra heat take their toll. If the tire survives long enough to be recapped, it has that much more of a chance of failure.
Handling. Low tires do not effectively transmit the momentum to the ground, in a curve the rim and tread will move much more in relation to each other than with a fully inflated tire. Back to the bike example, riding around on low tires is a bit wobbly.
I have seen the difference over time in tires run at 80psi vs 110-120psi, and the higher pressure results in longer tire life, fewer blowouts, and less downtime, fenders, ABS wires, mudflaps, etc replaced as a result. I used to work with self unloading trailers, and when the super singles blew on one particular brand of trailer it would typically take out the liftgate hydraulics or the conveyor hydraulics as well. $1500 day by the time it was done, just for a slightly cushier ride. Not worth it IMO.
Tire companies are also in the business of selling tires. If the tires last too long and get recapped, and successfully reused for a long time, they don't make as much as if the tire lasted just until it was worn or recapped. Enough fairly recently recapped tires blow, and companies will stop using them, buying new tires instead.
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good article, now I'M totally confused.

magoo68 · Sep 24, 2014

Funny how a lot of tire shops feel uncomfortable airing tires up over 105 unless they cage tire but kr junkies have no issue going 120 to 130 psi on their tires ... Ps any defect in RIM and your facing a potential bomb ... Didn't the maintenance counsel issue a warning to their carriers that they should check tire pressures because some guy on radio had told them to run higher pressures than what some rims were rated for a few years back

Richter · Sep 24, 2014

magoo68 said: ↑

Funny how a lot of tire shops feel uncomfortable airing tires up over 105 unless they cage tire but kr junkies have no issue going 120 to 130 psi on their tires ... Ps any defect in RIM and your facing a potential bomb ... Didn't the maintenance counsel issue a warning to their carriers that they should check tire pressures because some guy on radio had told them to run higher pressures than what some rims were rated for a few years back
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Michilan testing shows an aluminum rim will withstand 400 psi. Even with dings it will hold way over 120 psi. Most rims are rated for at least 120.

magoo68 · Sep 24, 2014

A tire shop we use has a 25 yr tire man with half his face scarred when the lip of the rim let go on what appeared to be a perfectly fine rim he refuses to air up over a 100 psi and I don't blame him if there's a defect hi pressure will find it sooner than recommended pressure besides the gain in fuel milage is small but the extra stresses from the hard tires pounding the suspension probably eat that up anyways long term I bet it's a wash anyways

mattbnr · Sep 24, 2014

magoo68 said: ↑

A tire shop we use has a 25 yr tire man with half his face scarred when the lip of the rim let go on what appeared to be a perfectly fine rim he refuses to air up over a 100 psi and I don't blame him if there's a defect hi pressure will find it sooner than recommended pressure besides the gain in fuel milage is small but the extra stresses from the hard tires pounding the suspension probably eat that up anyways long term I bet it's a wash anyways
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For every .1 mpg gain you save $1400 a year on fuel roughly if you run 120,000 miles a year. So no it's not a wash.

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