Tire Question...12R22.5

[birdshill123]

Although the 315's are one "mother of a tire" I can foresee some
problems. Michelin says you can use them on a 8.25 inch rim. BUT this
makes the tire 3/10ths of an inch wider for a total width of 12.8
inches. The 12R's are 11.4 wide. That is almost an inch and a half
wider. I would be concerned about the duallies rubbing. The Michelin
truck tire book also derates the tire when mounted on a 8.25 inch rim.
When used as a single it goes from 9090 per tire to 8000 at maximum
inflation. One of the biggest advantages of using this tire would have
been the ability to run lower pressures with the same load capacity.
The derating negates most of that advantage. I will stick with the
12R's.

Bruce 1988 FC35