Classic Lightweights UK
Classic Components  

Harden bottom bracket 

Author: Alexander Von Tutschek

AVT BB 2 - 300
Harden Bottom Bracket Unit Part No C5000

This is an alloy unit in which are fitted bearing races and a tool-steel axle in the end of which is a grease nipple. The barrel of the unit is 2 5/8" long and to use this device the threads of the bracket must be removed, it is held in place by a locking ring at either end.

AVT BB 1 - 300

This is another rare Harden product designed by the same man who designed the Freewheel hub.The word Harden is sometimes marked on one face of the unit.