Rim max PSI
Am in the process of replacing the tires on the trailer. Current tires (and the ones which came with trailer) are load range C and maximum psi is 50. Have been looking at the new Goodyear Endurance...
Forum Discussion
Well, you *could* simply run the Endurance tires at 50 psi and get the same load capacity rating as on your old tires and get the benefits of higher speed rating and a quality tire. But you really want to be able to use 65 psi to get more reserve load capacity (helps reduce risk of a blowout) and improve handling/sway. It's normally recommended to run ST type tires at the max. sidewall rating.
Upgrading to Endurance tires has caused a lot of confusion out there because the tires have a higher psi rating in the equivalent size. The RVtiresafety.net blog has some great info. on the Endurance tires and pressure. You could always send Roger Marble a message too. Interestingly, the old Marathons according to GY could be run up to 75 mph if you added another 10 psi to the psi rating of the tire and I don't recall reading anywhere about GY stating you should check the max psi rating of the rims first. Aluminum TT rims allegedly may have a psi rating stamped on the rear/inside of them if you pull one off. I too have never heard of an aluminum rim being damaged from too high a pressure. If rims could be damaged from too high a pressure, you'd expect to hear of a lot of rim failures because tire pressure can go waay up in hot weather and/or when towing at speed on highways.
Our TT was available with optional LRD tires in place of standard LRC (15") and we got the optional Marathons in LRD. This also gave us much higher reserve load capacity of around 30% which is way above what most TT owners have. End of this season they're due for replacement and will be going with the Endurance tires which will have a higher psi rating of 80 (up from the original standard LRC 50 psi). If I can't find a rating on the rims I might just run them at 65 psi and still get the already much higher load capacity rating. FWIW, I always check psi (cold) on each leg of a trip on long road trips. Large swings in elevation and/or temp. can change tire pressure quite a bit besides the possibility of a slow leak.
I too have always worried about going over 65 mph. It's so easy to slip over 65 when cresting a hill, on long downhill sections or having a tail wind come up even with C/C on. I use our GPS as a speedometer and my copilot and I both keep our eyes on the speed. It would be sooo nice not having to worry about slipping over 65 now and then. I don't like going over 65 regardless tho. Never a tire issue in 4 seasons on Marathons, touch wood...
Upgrading to Endurance tires has caused a lot of confusion out there because the tires have a higher psi rating in the equivalent size. The RVtiresafety.net blog has some great info. on the Endurance tires and pressure. You could always send Roger Marble a message too. Interestingly, the old Marathons according to GY could be run up to 75 mph if you added another 10 psi to the psi rating of the tire and I don't recall reading anywhere about GY stating you should check the max psi rating of the rims first. Aluminum TT rims allegedly may have a psi rating stamped on the rear/inside of them if you pull one off. I too have never heard of an aluminum rim being damaged from too high a pressure. If rims could be damaged from too high a pressure, you'd expect to hear of a lot of rim failures because tire pressure can go waay up in hot weather and/or when towing at speed on highways.
Our TT was available with optional LRD tires in place of standard LRC (15") and we got the optional Marathons in LRD. This also gave us much higher reserve load capacity of around 30% which is way above what most TT owners have. End of this season they're due for replacement and will be going with the Endurance tires which will have a higher psi rating of 80 (up from the original standard LRC 50 psi). If I can't find a rating on the rims I might just run them at 65 psi and still get the already much higher load capacity rating. FWIW, I always check psi (cold) on each leg of a trip on long road trips. Large swings in elevation and/or temp. can change tire pressure quite a bit besides the possibility of a slow leak.
I too have always worried about going over 65 mph. It's so easy to slip over 65 when cresting a hill, on long downhill sections or having a tail wind come up even with C/C on. I use our GPS as a speedometer and my copilot and I both keep our eyes on the speed. It would be sooo nice not having to worry about slipping over 65 now and then. I don't like going over 65 regardless tho. Never a tire issue in 4 seasons on Marathons, touch wood...
