IRD Tenacity QB-40 Bottom Bracket - JIS
| Width: 68mm BB width |
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Cup and cone bearings with polished races? Steel cups? Retro yes, but these have much bigger balls than those in sealed cartridge bearings, so they will work longer and handle more load.
You would think the more modern cartridge bearing bottom bracket would take more abuse and neglect, but you'd be wrong.
- 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)
- For 68mm wide shells
Made in Japan