BSA CRANKSHAFT BEARING B31 B32 B33 B34 M20 M21 HEPOLITE MRJA 7/8 24-0722Genuine Hepolite Main Crankshaft Roller Bearing. As fitted to : BSA B Group timing side. BSA B31,B33, B32 B34 Competition (1949 57), B32 B34 350 500cc Goldstar (1950 ), M20 M21 500 600cc (1945 57) Crankshaft T S bearing. MRJA 7 8 Manufactured to the OEM specification with 11 rollers to increase the radial load capacity. All current neutral brands supply this bearing with only 9 rollers, which is not fit for purpose for BSA models. CNC Brass Cage, C3