Description Tire and rim assembly for Cat Trax. 21 balloon tire on our anodized aluminium rim. This wheel assembly will fit any Cat Trax. It is of tubeless design, but will accept an innertube if you wish to put one in. If you have the old style, withchevron tire, needle valve inflator, that has finally given up the ghost, then this is the replacement. If converting from old to new you will need to add a set of nylon washers, and maybe cotter pins if the ones removed get ruined.