Forum Discussion
Me_Again
Apr 11, 2014Explorer III
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 happens with it's load carrying capability if you never operate it over 65 or 70 MPH? Michelin lowers the rating of this tire in RV service to 75 MPH. They were/are used on many smaller older Class A MH's and Class C's
Chris
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