A transmission assembly installed on a freehub body of a bicycle is provided. The freehub body rotates about a rotation axis and is provided with a torque transmission portion on a radial outer side. The transmission assembly includes a first adapter having a main body portion connected to the torque transmission portion, a second adapter having a second connecting portion and a pressing portion connected to the second connecting portion, and a friction member. The main body portion is sleeved on the freehub body and includes a first connecting portion having a first thread portion. The second connecting portion has a second thread portion adapted to be screwed to the first thread portion of the first connecting portion. The friction member is disposed in an accommodation space formed by the pressing portion, the radial outer side of the freehub body and one side of the first connecting portion.

A training wheel assembly includes an assembly frame and a training wheel rotatably attached to the assembly frame. The training wheel has a wheel axle extending therefrom and defining an axis about which the training wheel rotates, and an annular hub concentric with the wheel axle and rotationally fixed therewith. A plurality of successive ratcheted teeth facing the assembly frame form a circumferential inner edge of the wheel. An elastically deflectable tongue is attached to the assembly frame and is selectively extendible into a rotational path of motion of the ratcheted teeth, whereby upon rotation of the training wheel with respect to the assembly frame about the axis, contact of the elastically deflectable tongue with successive teeth of the plurality of ratcheted teeth generates an audible sound indicating that the training wheel is rotating.

A bicycle cassette comprises a clampstyle connection for connecting the bicycle cassette to a bicycle hub driver body. The bicycle cassette is attached to a bicycle hub driver body by incorporating a clamp structure into one portion of the cassette, which then rigidly clamps onto the driver body of the bicycle hub. In addition, when combined with a bayonet style attachment structure between two parts of the cassette, it allows for the use of a smaller sprocket on one segment of the cassette. Specifically, it allows a small 9 or 10 tooth sprocket to overhang the cassette driver body on a bicycle hub, by attaching the small cog assembly to a larger cog assembly using a bayonet style attachment.

The present invention relates to a freewheel hub for a bicycle, comprising a freewheel device which optionally allows relative rotation between a hub sleeve and a driver or couples the hub sleeve and the driver in a torque-transmitting manner. The freewheel device has at least one first clutch ring and at least one second clutch ring, wherein the first clutch ring is coupled or coupleable to the hub sleeve in a torque-transmitting manner, and wherein the second clutch ring is coupleable or coupled to the driver in a torque-transmitting manner, and wherein the first and the second clutch ring are displaceable axially relative to the hub axle between an engaged position and a freewheel position. Provision is made here for at least one magnet arrangement accommodated in apertures in the first clutch ring to keep the clutch rings in the engaged position.

A bicycle hub includes an axle, a main body, a freehub body, and a clutch, which are engaged with the axle, wherein the clutch includes a first ratchet and a second ratchet. The first ratchet and the second ratchet are respectively engaged with the main body and the freehub body. The first ratchet has a first engaging surface, and the second ratchet has a second engaging surface facing the first engaging surface. The bicycle hub is characterized in that a minimum of number of first ratchet teeth on the first engaging surface is seventy-two, and a number of the second ratchet teeth on the second engaging surface is lesser than the number of first ratchet teeth. With such design, when the first ratchet is meshed with the second ratchet, the freehub body could stably drive the main body, and a total weight of the bicycle hub could be decreased.

A bicycle hub includes an axle, a main body, a freehub body, and a clutch, which are engaged with the axle. The freehub body is disposed with first splines, wherein each of the first splines is defined to have a longitudinal direction. Each of the longitudinal directions obliquely intersects with an axial direction of the freehub body. The clutch is disposed with second splines, wherein the second splines are engaged with the first splines in a way that the second splines are movable along a longitudinal direction of the first splines. With such design, the clutch of the bicycle hub could be smoothly operated.

A modular wheel-hub bearing unit having an outer flanged hub for mounting the unit on an upright of a vehicle, provided externally with an assembly surface and internally with a mounting seat; and a bearing provided with an outer ring, two inner rings and two rows of rolling elements arranged between the outer ring and the two inner rings. The bearing being mounted inside the assembly seat independently of the outer flanged hub and having an outer diameter, the dimensions of which are related to the dimensions of an outer diameter of the assembly surface of the flanged hub by a first coefficient (α) according to the relation: D2=α*D1, where 0.80≤α≤0.95.

A modular wheel-hub bearing unit having an outer flanged hub for mounting the unit on an upright of a vehicle, provided externally with an assembly surface and internally with a mounting seat; and a bearing provided with an outer ring, two inner rings and two rows of rolling elements arranged between the outer ring and the two inner rings. The bearing being mounted inside the assembly seat independently of the outer flanged hub and having an outer diameter, the dimensions of which are related to the dimensions of an outer diameter of the assembly surface of the flanged hub by a first coefficient (α) according to the relation: D2=α*D1, where 0.80≤α≤0.95.

A sprocket support body is rotatably mounted on a hub axle of a bicycle rear hub assembly. The sprocket support body comprises at least ten external spline teeth configured to engage with a bicycle rear sprocket assembly. Each of the at least ten external spline teeth has an external-spline driving surface and an external-spline non-driving surface. The at least ten external spline teeth has an external-spline major diameter equal to or smaller than 34 mm. The sprocket support body is free of external spline teeth having another external-spline major diameter that is different from the external-spline major diameter.

A pedal driven cycle comprising a cantilevered frame member coupled to a power input sprocket and a driven sprocket; a belt drive connecting the power input sprocket to the driven sprocket; and a side mounted rear wheel releasably coupled to a multi-speed gear hub that is coaxial with the side mounted rear wheel, wherein the multi-speed gear hub is coupled to the driven sprocket.