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Post by bc75 on Jun 14, 2017 16:08:54 GMT -5
My recommended max tire pressure is 50. I have been running it at 40 because i know as you drive the air heats up and the pressure goes up.Should i run it at max or will it cause my tires to blow out.
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Post by lynnmor on Jun 14, 2017 16:33:16 GMT -5
Run it at 50. Check and adjust pressure when tires are cold.
Lower pressure will cause more heat as the tires flex more.
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Post by Chuck on Jun 14, 2017 21:27:59 GMT -5
What ever the tire pressure reads on the tire that is what should be in the tire when it's cold, as lynnmor stated never ever check air pressure when hot only cold. I check the temp of my axle hubs when ever I stop with my hand, if to hot to touch then you have a problem, some people use a hand held temperature gauge were you can point at the axle hub and it reads the temp. I will say that 8 out of 10 times all my hubs feel about the same give or take some ob both my 5th wheel and truck. Some may ask how can you tell, after years of feeling hubs on semi's I can tell a hot axle hub an if it's to hot you can smell it as well, just like bad/stuck brakes, you can smell it a mile away LOL Safe Travels & Don't forget about the Kz Rally this Summer  Chuck |
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Post by ronc on Sept 4, 2017 18:02:16 GMT -5
Lynnmor is right. They will get warm and the pressure will go up, but the tires are designed to allow for that, provided the correct COLD tire pressure was the starting point.
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Post by myredracer on Sept 5, 2017 9:36:44 GMT -5
Basic ST tire info.:
The "maximum" pressure designation on the tire's sidewall is a bit confusing. For ST type tires, it should also be considered the minimum. Load capacity rating is reduced with lower psi and you generally don't want to do that unless you understand a tire's max load capacity rating and tire inflation tables and know what a trailer weighs. Pressure must be set "cold" (tires not in sun and not towed on for at least 2 hours) at what the prevailing ambient temp. is and never adjusted after that, even if the pressure seems high. If on a road trip, it's a good idea to check the psi before each leg of a trip, especially if the ambient air temp changes much and/or if elevation changes much. A portable compressor is a good thing to have on road trips and we have a 12 volt Viair.
Internal heat damages the internal structure of ST tires. Under-inflation causes heat but you should also never tow overloaded on a tire(s) or exceed 65 mph (unless the specific tire is rated higher) which both create heat. The end result will be a "blowout" or in tech. terms, "run low flex failure" and a trailer will suffer significant and expensive damage.
It is always a good idea to weigh a trailer and see what the load is on each side and on each axle. In some cases, a manufacturer provides inadequate reserve load capacity on tires which is another thing that can lead to tire failure. Reserve load capacity is the difference between the max. weight rating on the tires and actual weight of your trailer. A min. of 15% is recommended. We have approx. 30% due to the optional LRD tires we ordered. Reducing psi below the sidewall max. can result in too low reserve load capacity or even result in being overloaded.
In some cases, it may be necessary to use lower psi than the sidewall max. if upgrading to a higher load range tire and the rims are not rated for the required higher pressure, like say if you were installing the new Goodyear Endurance ST tire in certain sizes.
For lots of excellent and in-depth info. on RV tires from a retired tire engineer, go to RVtiresafety.net. Unfortunately, when people buy a towable RV, nobody explains the limitations and characteristics of ST tires and not to exceed 65 mph, tow overloaded or tow under-inflated and it's typically not until a person goes to an RV forum or blog like RVsafety.net that owners learn about ST tires.
Gil, Deb and Dougal the Springer Spaniel
2014 KZ Spree 262RKS
2009 F250
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