Carlisle Ultimax 3 has evolved into Ultimax PRO. Thicker cross section so more surface area is in contact with clutch. New cog design dissipates heat and aids flexibility Runs cooler for better performance. Run cool, run long & run fast with Ultimax PROAdditonal Fitment:2001-2001 POLARIS INDY XCF SP2000-2000 POLARIS 600 TOURING1999-1999 POLARIS INDY 700 XCR2000-2000 POLARIS 600 XC SP1999-1999 POLARIS INDY 500 XC1999-1999 POLARIS INDY 440 XCR2001-2001 POLARIS INDY 500 SKS2000-2000 POLARIS 500 XC SP2000-2000 POLARIS 500 XC1999-1999 POLARIS INDY 800 XCR2001-2003 POLARIS 600 CLASSIC TOURING1999-1999 POLARIS INDY 500 XC SP2000-2003 POLARIS 800 XCR2000-2002 POLARIS 500 RMK