Abstract: A quick-clamping system for fixing the hub of a wheel between dropouts of a fork or chainstays of a bicycle having a tension axle (1) with a means for exerting axial compressive forces (3) and a first clamping surface (4), both being arranged at a first end (2); a locking mechanism (6) having a second clamping surface (7) and blocking a second end (5) against axial motion; a counter piece (8), wherein counter piece (8) and second end (5) can be detachably connected by means of axial plugging, and wherein the counter piece (8) has an axially moveable, operable unlocking mechanism (9) by means of which the locking mechanism (6) can be unlocked, so that counter piece (8) and second end (5) can be detached from each other.

Abstract: A torque coupling comprising a drive body, an output side body which is coaxially arranged, a pressure disk which is coaxially arranged, movable in rotation coaxial direction, and having a first torque transmission surface on its face side, and a torque transmission device. The torque transmission device (5) comprises rigid pressure transfer elements (6) loadable by compressive forces only upon a gripping of the non driven by the driven torque transmission surface which points in drive direction (A), thereby moving in rotation coaxial direction contrary to the pressure disk (3), and pressing the same in direction of the second torque transmission surface (4B).

Abstract: A quick-clamping system for fixing the hub of a wheel between dropouts of a fork or chainstays of a bicycle having a tension axle (1) with a means for exerting axial compressive forces (3) and a first clamping surface (4), both being arranged at a first end (2); a locking mechanism (6) having a second clamping surface (7) and blocking a second end (5) against axial motion; a counter piece (8), wherein counter piece (8) and second end (5) can be detachably connected by means of axial plugging, and wherein the counter piece (8) has an axially moveable, operable unlocking mechanism (9) by means of which the locking mechanism (6) can be unlocked, so that counter piece (8) and second end (5) can be detached from each other.