In addition, rims are often rated by the air pressure they can carry. Of course, the rim must be rated at least as high as the pressure you plan to put in the tire. 15" tires are commonly (but not always) Load Range-D, and LR-D tires are usually rated to carry 65 psi. So your rim should be rated for at least 65 psi. Some folks go to Load Range E tires, which can be rated at 80 psi. In either case, you should be sure that the tire jockey installs a new metal valve stem, rather than the rubber stem that may have been pre-installed in the rim.
As Padgett noted, tires for TMs are usually spec'ed to be mounted on 15X6 rims. Some of them can also be mounted on a 7" rim, but that is too wide for the TM's wheel well. The five lug wheels on most TMs have a bolt spacing called "5 on 4 1/2", and have a zero offset.
Bill
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