IRD Tenacity QB-40 Bottom Bracket - JIS
68mm BB width
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Cup and cone bearings with polished races. Retro yes, but these balls are bigger than those in sealed cartridge bearings, so they will work longer and handle more load.
- 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