BSA QD Rear Spindle BSA A65 & A50

This is the Quickly Detachable or “QD” type spindle for BSA machines.  The spindle length is 7-3/8″ (under the head).  BSA Unit Twins A65-A50 models only from 1967-1970 with the “Q.D. rear hub have two fitment sizes relating to thread diameter.

Select as appropriate:

• 11/16″-20TPI (this is the bar width)
• 9/16″-20TPI (shouldered, narrow at thread end)

Note some information may suggest one size fits all BSA models, it doesn’t so please check your needs.