Quote:
Originally Posted by Buzzy4
....the 65 mph max. speed does have me hesitating. I have noticed that the Marathon has an R speed rating (up to 106 mph)...
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hi buzzy4...
the R u c on the gyms, relates to radial ply construction.
ST (tires stamped with the special trailer SERVICE DESIGNATION) tires aren't speed rated,
in the way modern conventional passenger tires are.
basically the
speed rating is the speed, passenger tires are capable of maintaining for 10 MINUTES before tire failure.
speed ratings are used for passenger car tires and some LT tires only.
ST designated tires are LOAD rated AT 65 mph...
with guidelines provided (inflation/load) for up use to 75 mph.
my reading suggests that all ST designated tires are load rated at 65 mph.
the bruising issue is important.
my approach, which may be total horsehocky, to this issue is....
1. mark the tire at the area it's been stressed (from curbs, chucks, ramps, blocks, holes or whatever)
2. remove from trailer and inspect the marked area, also inspect the rim carefully and wheel weights.
3. reduce air pressure to 20-25 psi and 'feel' the tire for soft spots or irregularities...
4. INFLATE to max psi +10 psi more (75 psi for a gym)
5. look for visual signs of belt or tire weakening, if ANYTHING is found, ditch the tire.
6. if it looks and feels normal, reduce pressure to 65 psi and use it again.
7. occasionally check the MARKED area for signs of weakness, while giving attention to temps and pressures.
8. if the space is a fresher, less worn or less "stressed' tire, consider swapping.
cheers
2air'