Track Mounted Models SP5014 NTXNumber of teeth on cutterwheel36 . SP6016 TRXNumber of teeth on cutter wheel36 Razor Teeth20-Standard tooth SP7015 TRXNumber of teeth on cutter wheel48-Razor Wheel / 32-Standard Wheel SP8018 TRXNumber of teeth on cutter wheel76 Razor Hurricane RSNumber of teeth on cutterwheel76 Hurricane TRXNumber of teeth on cutter wheel132, razor wheel is only wheel offered