THIS IS A BRAND NEW STEEL REAR SPROCKET FOR ATC250R 1986, TRX250R 1986-89, AND TRX300EX 1993-2001. **** PLEASE NOTE **** THE CENTER HOLE IS ROUND NOT CLOVERED AND MOUNT HOLES ARE NOT TAPERED. 90L/90MCHOOSE_NUMBER_OF_TEETH: 39T_(90M)38T_(90L)