There are litereally hundreds of threads asking the same or close to the same question.
I'm in a good mood though, so I'll save you the search this time and tell you that I have 31-10.50x15's on my Tracker on stock sammy wagon wheels, which have the same width as stock tracker rims. They will fit, just run them with no more than 20-25psi to keep them from rounding too much...