The Ratchet LN upgrade kit enables the conversion of DT Swiss 3-pawl hubs to the renowned DT Ratchet freehub system. Pawl freehub systems create relatively small engagement surfaces, which result in higher stress on the contact area. The Ratchet System is extremely reliable due to the simultaneous engagement of the ratchet faces, distributing the force evenly over a large area. In addition, the Ratchet System is modular, so the engagement angle can be increased by replacing the included 18 tooth ratchets with 36 or 54 tooth units (sold separately). DT are the original ratchet hub innovators.