FastEagle wrote:
FastEagle wrote:
Here I’m going to talk about a specific tire. It’s talked about a lot on the internet tire threads but is yet to be tested as an Original Equipment tire. I bring this particular tire up because it has a double standard speed rating. It’s the Michelin XPS Rib. If a buyer goes down to their local Michelin retailer and purchases some XPS Ribs as replacements for some ST tires they will most likely get XPS Rib tires with a “Q” (99 MPH) speed symbol molded into the tire. When that same tire is used as OE on a RV the symbol is omitted and the specs in the RV usage section of the Michelin document will list the speed rating for that use as 75 MPH. Because the tire is not used as OE in the RV trailer industry it’s a toss-up as to it’s speed restriction on those axles. Can you shed some light on that?
XPS highway tire specs
XPS RV tire specs
FastEagle
Look at this, I'm now quoting myself.
I'm using this again because I think CapriRacer may have missed my point. There are ZERO Michelin LT tires in service as OE on RV trailer axles. However, they are used on class B/C self propelled RVs. When used in that position the Michelin RV tire manual shows a speed restriction of 75 MPH. When the same tire is used on truck or van axles without the RV connection they have a "Q" speed rating.
Why the double standard? And, when selected for service on the RV trailer axle by it's owner what should the rating be? Because it may be replacing an ST tire with a speed restriction of 65 MPH should it be the same?
FE
And I will repeat myself as well.
Just because a tire has a speed rating for one application doesn't mean it can't have a more restrictive speed limitation in another application. You have to be very careful when you compare stuff like this. The application may change things - just like the difference between LT and ST applications.
