Replaces the original BSA cush drive nut, this upgrade nut has a large hex head so a socket can be used to make tightening the nut and torqueing an easy job. There are also two threaded holes to secure a degree disc if timing if required.
The nut is critical for holding the drive side bearing tight, so torque setting is 65 ft lbs & use a small anount of thread lock.
Please note: Fits A7 A10 B33 swingarm models only.
Does also fit M21
