CHAIN SHEAVENUMBER 40 ON DIAGRAMWIDTH OUTER RING B1 (mm) 36MAX INNER RING D2 (mm) 35WIDTH INNER RING B2 (mm) 20OUTER DIAMETER D3 (mm) 82WIDTH OF THREAD B3 (mm) 27MAX OUTER RING D1 (mm) 92.4REF NUMBER LS1771