PSI
Trailer says 50psi, tires say 65psi, tire store says 5 less than max which is 60psi. Who is right?
Forum Discussion
It sounds like the tires have been upgraded from LRC to LRD and you want to run them at 65 psi as per the sidewall, not the placard psi.
From Roger Marble's RVtiresafety.com blog:
Trailers: You should set the Cold Inflation to the pressure on the tire sidewall. If you look at the sticker on the side of your trailer you should find the tire size, type, Load Range and pressure recommendation from the manufacturer. In almost all cases the recommended inflation is the inflation on the sidewall of the tires.
Basically running a tire when low by 20% or more, can damage the body cord.
It is well documented that as a group, RV tires are more likely to be overloaded and or underinflated than any other type of tire. Somewhere he says about 1/2 of all RVs.
Roger also highly recommends going to a scale to find the weight on each tire to ensure none are overloaded. You can't raise pressure to increase a tire's load rating though.
For GY Marathon tires only, you can increase the pressure by 10 psi to 75 psi and be able to run at max. 75 mph but only if your rims and valves can handle 75 psi. GY tech. bulletin
From Roger Marble's RVtiresafety.com blog:
Trailers: You should set the Cold Inflation to the pressure on the tire sidewall. If you look at the sticker on the side of your trailer you should find the tire size, type, Load Range and pressure recommendation from the manufacturer. In almost all cases the recommended inflation is the inflation on the sidewall of the tires.
Basically running a tire when low by 20% or more, can damage the body cord.
It is well documented that as a group, RV tires are more likely to be overloaded and or underinflated than any other type of tire. Somewhere he says about 1/2 of all RVs.
Roger also highly recommends going to a scale to find the weight on each tire to ensure none are overloaded. You can't raise pressure to increase a tire's load rating though.
For GY Marathon tires only, you can increase the pressure by 10 psi to 75 psi and be able to run at max. 75 mph but only if your rims and valves can handle 75 psi. GY tech. bulletin
