Tire inflation

kutuzov · Apr 17, 2017

http://m.truckinginfo.com/article/175582/are-your-wheel-bearings-adjusted-properly

I'm not really familiar with this I'll research it, and throw my conclusions. For now I'm sort of an ignorant on this matter.

Cat sdp · Apr 17, 2017

120lbs cold all around.....

11R24.5 H..... short hauls , heavy weights.

reverendhandy · Apr 17, 2017

kutuzov said: ↑

I'm an o/o since September. My truck and trailer come with recaps, and I let them wear before buying new tires. The wear also helped me determine other staff that needed to be done to truck/trailer. Have to redo all 10 brakes drums and pads, all 10 shock absorbers and alignment. I now have the tires to even wear where I can buy new ones and I know they won't go bad for other pieces of equipment not working correctly. In the process I have learned some basic maintenance things, and even was able to fix minor mechanical problems like the trailer abs. My trailer come with a meritor auto inflate system too, that I've learned how to set. So now I'm all in on buying the remaining 10 tires that will have my truck/trailer out of recaps for good.

So I started researching the best psi configuration for the tires and it seems the original 100 psi is "overinflation". I have 18 295/75/22.5 tires. The recommended psi by manufactures is 75 psi at 65 mph, 80 psi at 70 mph, I normally cruise at 65 mph but occasionally on a real tight load I go full speed limit 70-75 mph or even 80 mph in the mid west. So taking that into account and the fact I don't wanna run the bare minimum brings me to 85 psi per tire, except the steer that I'll keep at 110 psi.

Now and here is my real question I have settle for 90 psi on drive and trailer. The trailer has the auto inflate so I can relay on that for a 85 psi set up, but the drives don't I sincerely I don't check psi on a daily bases I do bang the tires at least twice a day but I don't have the time for pressure check every day. So if I run 85 psi on trailer or even 80 psi on trailer and drives at 90 psi, would that be a future wear problem?
Click to expand...

My tires on my freightliner and 3 axle trailer are all Michelin and rated at 120 cold psi. Per our tire rep, I run all 22 tires at 110 psi. Warm they sit right around the 122 mark. 110 is recommended because it puts less strain on the bands and sidewalls. If they were inflated to 120, at operating temp, they would be up around 135 and the bands and side wall would be at max stretch.

AModelCat · Apr 17, 2017

Gotta think when you run a tire underinflated it causes extra stresses on the tire too. Excessive sidewall flex = heat = premature failure. Not to mention increased rolling resistance which = lower fuel economy.

gokiddogo · Apr 17, 2017

Made me go check myself there @not4hire
It must be something I learned from school on the 80 psi. I can't find anywhere it says a specific number, just for the load carried and tire rating.
Learn something new every day.

Cat sdp · Apr 17, 2017

What is this school you speak of..?

gokiddogo · Apr 17, 2017

A building filled with students and teachers

snowwy · Apr 17, 2017

Tires pop from being underinflatedm correct????

Less pressure = greater heat.

110 psi runs cooler then 80 psi.

kutuzov · Apr 17, 2017

snowwy said: ↑

100 to 110 is the standard.

If you want to run low. And be harassed for tires bulging. Guess that's your decision.

BTW. You didn't say anything about bearing tightness. That makes a difference in proper alignment and I believe is routine maintenance at 100k miles. They do wear and get loose. Ya know.
Click to expand...

I'll see if my mechanic does this and how much he charges for proper adjustment. Also I'm pretty sure if he opens those,he will find something to fix and more $$$. After 65k miles I haven't got any wheel bearing improper adjustment wear symptoms on the recaps, no recap got internal dose wear. The abs is working great no intermittent failure after I fix it, the remaining 10 recaps tires don't show this kind of wear. I do have 2 trailer tires that shows uneven shock absorbers/suspension wear, which I already fixed. But it won't hurt to adjust them.

kutuzov · Apr 17, 2017

To finish my tire psi dilema.
80 is bear minimum so no

90 is a safe bet, but requieres more attention than I'm willing to give.

95 once a week psi/tread depth on cold sound good. Over inflated by 15 psi but not as much as conventional wisdom.

100 Most common tire pressure, but overinflated, if I check and inflate my tires once a week there's no need to overinflate.

So I'll settle in mid ground at 95.

Thanks for the inputs!

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