24-6860  aka  1178 X/1130

These bearings have been adapted from commercial taper roller bearings.

The o/d has been reduced to 1 3/4" and a bush has been made to reduce the i/d to 5/8"

This internal bush increases the overall length of the bearing to 13/16"

The new bearing is higher capacity than the original and also others claiming to replace them.

Known to fit,

BSA M20 M21 Rigid

BSA M24 

1929 BSA 4.93h.p. and 5.57h.p. de Luxe. Front

1929 BSA 4.93h.p. O.H.V. Single Port and 2 Port. Front

1929 BSA 7.70h.p. Light. Front

1929 BSA Rear. 3.49hp S.V.  3.49hp OHV 2-port Super.  4.93hp, 5.57hp Standard and De Luxe.  4.93hp OHV Light 2-port. and single port. 7.7hp Light.

1930 BSA 9.86 W.T. G30-16 and many others.