ST trailer tire 75 mph rated
For those who prefer to tow a little faster than 65 mph, as well as for those who would like some extra cushion in their tires' speed rating, I recently learned that Hercules ST tires are rated for 75...
Forum Discussion
I can run our GY Marathons between 66 & 75 mph just by adding another 10 psi as per their bulletin PSB #2014-01.
They say "If Goodyear tires, with the ST designation, are used at speeds between 66 and 75 mph (106 km/h and 120 km/h), we recommend the cold inflation pressure be increased by 10 psi (70 kPa) above the recommended pressure based on the trailer placard for normal inflation and load conditions." Note "recommend".
This seems somewhat confusing as I thought it's typically recommended to run your STs at the max. sidewall psi? I run ours at 65 psi. So what will happen if I pump them up to 75 psi for some extended freeway driving and then leave them at 75 for the rest of a trip which could be mostly 65 mph and under? I'd rather leave them at 65 psi and stay under 65 mph.
Does GY build their Marathons differently to be able to handle 75 mph?
I would hazard a guess that 99% of TT owners don't know how to take proper care of ST tires (correct psi, regular checking of psi, max. speed, potholes/bumps, UV rays, etc.). Nobody explains proper care to a new TT buyer. We camped a couple of months ago with some friends and before we left I asked if they had checked their tire pressure (LRD). Three were at 60 +/- psi but one was at 52 psi. They had no clue of the importance of correct pressure and regular checking. There has to been many thousands of TTs running around with under-inflated tires...
What I don't understand is why ST tires are designed and rated to run at max. 65 mph when there are an awful lot of roads out there where it's easy to get up to 70 mph or maybe more, especially if you want to go with the flow. 65 mph leaves a zero cushion. I tow at max. 65.00 mph but often on the interstate, I'd rather run in the 65 - 70 mph range to keep up with the prevailing flow of traffic.
They say "If Goodyear tires, with the ST designation, are used at speeds between 66 and 75 mph (106 km/h and 120 km/h), we recommend the cold inflation pressure be increased by 10 psi (70 kPa) above the recommended pressure based on the trailer placard for normal inflation and load conditions." Note "recommend".
This seems somewhat confusing as I thought it's typically recommended to run your STs at the max. sidewall psi? I run ours at 65 psi. So what will happen if I pump them up to 75 psi for some extended freeway driving and then leave them at 75 for the rest of a trip which could be mostly 65 mph and under? I'd rather leave them at 65 psi and stay under 65 mph.
Does GY build their Marathons differently to be able to handle 75 mph?
I would hazard a guess that 99% of TT owners don't know how to take proper care of ST tires (correct psi, regular checking of psi, max. speed, potholes/bumps, UV rays, etc.). Nobody explains proper care to a new TT buyer. We camped a couple of months ago with some friends and before we left I asked if they had checked their tire pressure (LRD). Three were at 60 +/- psi but one was at 52 psi. They had no clue of the importance of correct pressure and regular checking. There has to been many thousands of TTs running around with under-inflated tires...
What I don't understand is why ST tires are designed and rated to run at max. 65 mph when there are an awful lot of roads out there where it's easy to get up to 70 mph or maybe more, especially if you want to go with the flow. 65 mph leaves a zero cushion. I tow at max. 65.00 mph but often on the interstate, I'd rather run in the 65 - 70 mph range to keep up with the prevailing flow of traffic.
