CHAIN SHEAVENUMBER 41, 42 ON DIAGRAMWIDTH OUTER RING B1 (mm)30MAX INNER RING D2 (mm) 35WIDTH INNER RING B2 (mm)21.3OUTER DIAMETER D3 (mm) 104WIDTH OF THREAD (mm) 20.2MAX OUTER RING D1 (mm) 118REF NUMBER LS1856