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Old 08-14-2008, 04:36 PM   #15
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275/80R22.5 was introduced by Michelin. IIRC it is (was) a european size. The equivalent sise is 295/75R22.5. Both tires carry the same load at 110psi (G Load range) or 120 psi (H load range). Both tires are, for most purposes, interchangeable.

Over the road trucks are using both sizes. So demand really depends on if there is a glut of casings in either size.

Tom, Patty, Hannah "The Big Dog" and Abby Kat, Indianapolis, Indiana 2000 36' FDS 72232 Our Photos
We live out in our old van. Travel all across this land. Drive until the city lights dissolve into a country sky, me and you - hand in hand.
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Old 08-14-2008, 05:31 PM   #16
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I recently traded my '98 Alpine for an '07. I put on new 295/75s (equal size replacement for the original Toyos) in the fall of '04. I noticed about a year later that there were rub marks (shiny spots) on the frame where the tires had rubbed the frame on hard turns. Has anyone else noticed this on their early model Alpines? The '07 has a significantly better turning radius (50 degrees, I believe) compared to the '98. There was obviously a change in frame design to allow for the sharper wheel cut.

St. Louis, MO

2007 Limited SE 36FDTS
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Old 08-15-2008, 07:02 AM   #17
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At this point I am probably "well beyond my own headlights" with regard to the facts but I "believe" the G670 295/80Rs are similar to the Toyo 120s that WRV used just before switching to the G670s. My experience going from the old Toyo 295 75Rs to the G670 80Rs was that my speedometer is now about 3 MPHs slower when compared to other coaches and I am down about 100 RPMs from "normal" [realize the ECM can be adjusted to account for the apparent change in tire circumference]. Cant say the MPG has changed any based on going to the G670s. I totally missed the subtlety of the new 275 80Rs being equal to the old 295 75Rs...

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2003 40' MDTS
Garden Ridge, Texas
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