Most of the newer units have a 5 bolt pattern with a 4 1/2 inch bolt circle (5 on 4 1/2) . My 2000Classic uses 205/75/75 tires. I bought 4 wheels and tires from Tractor Supply over a year ago. You can buy complete assemblies also at Rural King, Menards, many farm supply stores and some Lowes. Does yours use 13", 14", or 15"?