Truck tires on tt?
We live in Florida & the summer heat destroys our tt tires. We keep them covered & don't drive over 65 mph, and yet, we blow tires every 2 years. We were advised by another RVer to use truck tires o...
Forum Discussion
"The tire engineers here on the forum tell us that "the dynamic forces involved when the tires in motion" are accounted for in the specifications of the tires. To put it simply, the figures the tire manufacturer states include the forces exerted on the tire while in motion, such as "increases of weight loading when traversing bumps in the road at speed".
Which make sense, as it would be difficult indeed for us to foresee actual loads in motion."
Those 'tire engineers' are wrong. The test spec for ST tires (FMVSS 109) only requires that they be stressed to 100% of rated load, and be tested for puncture resistance. There is no overload test embedded in that spec. When you tow on a curve there is a constant and huge increase in force on the outside tires that is not allowed for in the testing. When you tow in a cross wind there is a similar increase in force on the leeward tires that can also be in the many hundreds of lbs. Neither of these effects is taken into account unless the resulting force on the tires is less than their load rating.
Which make sense, as it would be difficult indeed for us to foresee actual loads in motion."
Those 'tire engineers' are wrong. The test spec for ST tires (FMVSS 109) only requires that they be stressed to 100% of rated load, and be tested for puncture resistance. There is no overload test embedded in that spec. When you tow on a curve there is a constant and huge increase in force on the outside tires that is not allowed for in the testing. When you tow in a cross wind there is a similar increase in force on the leeward tires that can also be in the many hundreds of lbs. Neither of these effects is taken into account unless the resulting force on the tires is less than their load rating.
