DT Swiss Ratchet LN Freehub Body - Shimano HG 11 MTN Standard Aluminum Sealed Bearing Kit w/ End Cap 12 x 142/148 mmDT Swiss Ratchet LN Freehub Body Shimano HG 11 MTN Standard Aluminum Sealed Bearing Kit w End Cap 12 x 142 148 mm. Ratchet LN freehub bodies support the entry level Ratchet System of DT Swiss primarily used in the lower price products like the 370 hubs. The Ratchet LN freehub body is designed to replace the 3 Pawl freehub system. Ratchet LN uses the same inner parts as the freehub Ratchet System where the difference lies in the freehub system seal