RENTHAL TWIN RING CHAIN WHEEL REAR SPROCKET. RENTHAL 1230-520-49. Outer is expanded at 200 ?. C and then fitted to inner, creating a permanent bond for the life of the sprocket. DR350 1990-1993. DR-Z400 SM-K5,K8,K7,K8,K9,L0-L8 2005-2019.
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