It's designed to go into frames with an internal diameter of 44mm

Length: 456mm

Labyrinth style spacers encapsulating/protecting the bearings

The B-RAD 3 includes zip ties

The ratchet closure is awesome

Box Three Prime 9 Speed Groupset - Single Shift - X-Wide 12-50T - 9 Speed netsuite-webdata-created It's designed to go intoThe Prime 9 range of components from Box has made many people rethink what a 9 speed drivetrain is capable of. Providing riders with all the range of a 12 speed setup but without the complexity, weight, and excessive shifting, Prime 9 drivetrains are also far more affordable. You can ride them hard and not shed so many tears when something inevitably wears out or breaks. Box Three is their best all rounder drivetrain that offers excellent performance