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Old 03-19-2018, 01:22 PM   #11
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Wouldn’t you think the tire manufacturer takes all that in consideration!
For obtaining maximum tire wear, yes. For determining optimal handling, no. They have no idea what type of vehicles the tires will be used on. Optimal handling psi is probably different on a tractor trailer rig versus a straight frame rig. Is it a low profile vehicle or a box rig that is like a rolling billboard? Flatbed trailer, etc? Gravel hauling dump truck?
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Old 03-19-2018, 03:37 PM   #12
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Wouldn’t you think the tire manufacturer takes all that in consideration!
Here is Michelins RV tire Care Use and maintenance guide. It's good reading. One good point in the material and that there has been a thread discussion on here is keeping equal tire psi across rear dual tires & dual axels, I'm using a Crossfire Equalization system with TPMS at 95psi which is giving me some peace of mind when on a long haul.

https://www.michelinb2b.com/wps/b2bc...s_Brochure.pdf
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Old 03-19-2018, 04:00 PM   #13
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If you read what's on the tire it says what the maximum pressure is allowed on a cold tire. It doesn't know what vehicle it is installed on. Always use the manufacturers recommend pressure, never the max.


If you go online you can find load/tire pressure tables for most tire manufacturers. I know Michelin and Good Year has them
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Old 03-19-2018, 06:38 PM   #14
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Originally Posted by RV Randy View Post
For obtaining maximum tire wear, yes. For determining optimal handling, no. They have no idea what type of vehicles the tires will be used on. Optimal handling psi is probably different on a tractor trailer rig versus a straight frame rig. Is it a low profile vehicle or a box rig that is like a rolling billboard? Flatbed trailer, etc? Gravel hauling dump truck?


All of that is not the concern. It’s the profile of the tire hitting the road. Too much psi and you’re riding on the center of the tire, too little and you’re riding on the edges.
For all the reasons in the attachment to my original post you need the correct tire pressure regardless what they are mounted on.
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Old 03-19-2018, 08:19 PM   #15
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Another thing to take into account on the tire pressures is TEMPERATURE. Most Tire manufacturers load/inflation index assumes the ambient temperature of 70 degrees F. For every 10 degrees + or - one needs to factor about 2 psi. so if one is aiming for 100 psi pressure and it is 60 degrees out and the tire has not been used in several hours and the sun is not shining on it....then 98 psi would be the correct pressure. Of course that all goes out the window if they are nitrogen filled, which most of the G and H rated tires are not. Also one should never remove air pressure from a hot tire, because you just cant tell how much pressure there "should be" in it.
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Old 03-19-2018, 08:20 PM   #16
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On my 2016 DX3, Model 35DS, there is a substantial difference in the weight on the left and right rear wheels. In such a case, according to Michelin, the pressure in all tires on the same axle should be the same and set for the tire(s) with the greatest load.

Wheel weights for my DX3, loaded for travel including passengers, was as follows:

Model: DX 35DS
Wheel Weight
RF.......4,350
LF........4,400
RR.......6,950
LR.......8,750
Total..24,450
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