Park Tool Bottom Bracket Retaining Sytstem Bbt-rs drumbeat21-809 2 is designed to fit

2 is designed to fit the most common tool fitting found on 7-to-12 speed cassette lockrings

and the fast recharging circuit

Developed in conjunction with world renowned bike fit company Gebiomized

- Comfort padded grab bar

Park Tool Bottom Bracket Retaining Sytstem Bbt-rs drumbeat21-809 2 is designed to fitBottom brackets have some of the highest torque specs of any component found on a bicycle. Despite this, some bottom bracket cups feature tool fittings that allow mere millimeters of engagement, which can be a problem when attempting removal or installation. Solution: the Park Tool Bottom Bracket Tool Retaining System. Used in conjunction with nearly any Park Tool bottom bracket tool, the BBT RS uses a spring based tension system to apply consistent,