If anyone don't want to run the trash aluminium rear sprockets anymore just like myself (I went thru a vortex sprocket in one month) then the jt sprocket part # jtr1490.xx will work available in the sizes we run.. Its slightly bigger around the hub but the holes are the right size and the distance between them is also spot on. Or go on jt sprockets website and look at the bikes it fits if you want to run other brands. That swingarm is the reason I did my research, no matter how much I adjusted the chain the aluminum sprocket kept deforming every day eventually allowing chain to slap around