Forum Discussion
FastEagle
Apr 11, 2014Explorer
Me Again wrote:mpierce wrote:
Remember, when seeing a tire that has a 65 mph rating, that is the speed rating, at FULL WT.
IF you run less wt. than the tire is rated for, you can increase the speed. I would wager almost all 17.5 tires in RV use, are well under their rated wt. Thus, you can run faster.
That is exactly what Michelin is telling people with XTA's on 5th wheels. They are rated to 4805 pound so a trailer with 7K axles will never load them very heavily. They have the 100KM(62MPH) rating.
Now do not try to apply this same logic to a light weight ST tire! The XTA weights 58.4 pounds.
You can look at this sliding scale in several ways. Take the XPS Rib rated to 99MPH and 3042 loading. What happen with it's load carrying capability if you never operate it over 65 or 70 MPH?
Chris
Michelin is wiggling around TRA standards with their 17.5” tires on 8000# axles. The TRA specifically says that tires with speed restrictions less than 65 mph can not be manipulated with air pressure/axle loads to attain increased speeds above 62 MPH.
FastEagle
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