Proper Tire Presure
What should the proper tire pressure be on ST205/75R15 tires on a travel trailer? Thanks
Forum Discussion
Run them at exactly what the "maximum" on the sidewall says.
I posted this in another thread:
Tires should be cold inflated to the tire's max. sidewall pressure in the morning before heading off or after at least 3 hours of sitting in full shade. Don't go by the placard figure. The tires may have been upgraded by an owner or the factory. We have factory optional LRD tires that should be run at 65 psi however the factory used their standard placard for LRC tires (50 psi). Using the placard psi in our case would result in serious damage and a blowout(s).
The term "maximum" used on the sidewall tires creates confusion. It is actually the temp. that the tire should be cold inflated to in order to carry the load rating indicated on the sidewall. Lowering the pressure can result in overloaded tires (not good).
Cold inflation pressure is the inflation pressure taken with tires at the prevailing atmospheric temperatures. Tire pressure only changes about 2% for every 10F change in temp. Running your tires low will damage them from overheating and is a good invitation for an eventual blowout. You should never bleed them down when they are hot. Tires are designed and tested to be able to withstand up to around 3 times the sidewall pressure so no worries about exploding tires from running in high ambient temps.
For some tires (only a couple I think) such as GY Marathons, you can raise the psi by 10 psi and be able to run at 75 mph max.
Go and google "RVtiresafety" and you will find your answer there. Lots of reading on anything you ever wanted to know about RV tires. Remember, ST trailer tires are more "delicate" in comparison to other tire types and you want to take all the recommended measures to take care of them to minimize premature wear and reduce the chances of a blowout. Heat is the biggest enemy of ST tires by under-inflating and/or running above 65 mph.
I posted this in another thread:
Tires should be cold inflated to the tire's max. sidewall pressure in the morning before heading off or after at least 3 hours of sitting in full shade. Don't go by the placard figure. The tires may have been upgraded by an owner or the factory. We have factory optional LRD tires that should be run at 65 psi however the factory used their standard placard for LRC tires (50 psi). Using the placard psi in our case would result in serious damage and a blowout(s).
The term "maximum" used on the sidewall tires creates confusion. It is actually the temp. that the tire should be cold inflated to in order to carry the load rating indicated on the sidewall. Lowering the pressure can result in overloaded tires (not good).
Cold inflation pressure is the inflation pressure taken with tires at the prevailing atmospheric temperatures. Tire pressure only changes about 2% for every 10F change in temp. Running your tires low will damage them from overheating and is a good invitation for an eventual blowout. You should never bleed them down when they are hot. Tires are designed and tested to be able to withstand up to around 3 times the sidewall pressure so no worries about exploding tires from running in high ambient temps.
For some tires (only a couple I think) such as GY Marathons, you can raise the psi by 10 psi and be able to run at 75 mph max.
Go and google "RVtiresafety" and you will find your answer there. Lots of reading on anything you ever wanted to know about RV tires. Remember, ST trailer tires are more "delicate" in comparison to other tire types and you want to take all the recommended measures to take care of them to minimize premature wear and reduce the chances of a blowout. Heat is the biggest enemy of ST tires by under-inflating and/or running above 65 mph.
