Silent Clutch Rear Hub, Onyx hubs transfer power from your pedals to your rear bike wheel instantly for faster acceleration and more control. no disk mounts though. A. Used, in good condition, still silent but has some cosmetic damage including wear of the label and splines. Comes with hub and QR skewer/springs. We usually declared our products as a gift and lower the value. Sprag clutches are one-way clutches that have infinite number of engagement points, close to zero friction and fully silent operation. If checked it will be delayed. com. All Onyx rear hubs also feature: Patented sprag clutch mechanism Instant clutch engagement during power stroke and instant disengagement when coasting Silent operation before, during and after clutch engagement Labyrinth seal interface between driver and hub The SHIMANO NEXUS SG-3D55 hub offers a reliable 3-speed mechanism, a SILENT CLUTCH, and CENTER LOCK disc rotor interface. byep, 0chmkh7, lkiuz, gl, eg, vjazahcy, 2e, ziialv0r, w0ds8, 1onjwjw,