Ooops, thanks Bobby, 255 was a typo, corrected now to 225!
TM puts ST225/75R15 tires on all TMs now. It should fit yours also but you may need a lift kit if you have less than 3" clearance from top of your current tire to the wheel well. The following search link should give you some relevant info:
http://www.trailmanorowners.com/foru...earchid=647904
Tim