This is an old school adjustable cup and cone bearing bottom bracket with polished races. The balls are bigger than the standard cartridge bearing’s balls and is less likely to crap out, so they can probably work longer and handle more load. If you keep it adjusted well and re-grease occasionally, it will outlast comparable cartridge gearing headsets.
- JIS square taper interface
- CNC machined steel cups
- SS41 steel lockring
- Polished ball races on cups and axle
- 1/4”x 11 ball retainers
- 1.37 x 24tpi (English threading)
Made in Japan