A pedaled drivetrain includes a drive mechanism, a wheel, a freewheel hub, and a locking mechanism. The wheel has a rotational axis. The freewheel hub connects the drive mechanism to the wheel, and the freewheel hub transmits torque from the drive mechanism to the wheel in a first rotational direction around the rotational axis. The locking mechanism has a locked state and an unlocked state. The locked state rotationally fixes a component of the drive mechanism to the wheel relative to the rotational axis.

A pedaled drivetrain includes a drive mechanism, a wheel, a freewheel hub, and a locking mechanism. The wheel has a rotational axis. The freewheel hub connects the drive mechanism to the wheel, and the freewheel hub transmits torque from the drive mechanism to the wheel in a first rotational direction around the rotational axis. The locking mechanism has a locked state and an unlocked state. The locked state rotationally fixes a component of the drive mechanism to the wheel relative to the rotational axis.

A pedaled drivetrain includes a drive mechanism, a wheel, a freewheel hub, and a locking mechanism. The wheel has a rotational axis. The freewheel hub connects the drive mechanism to the wheel, and the freewheel hub transmits torque from the drive mechanism to the wheel in a first rotational direction around the rotational axis. The locking mechanism has a locked state and an unlocked state. The locked state rotationally fixes a component of the drive mechanism to the wheel relative to the rotational axis.

A pedaled drivetrain includes a drive mechanism, a wheel, a freewheel hub, and a locking mechanism. The wheel has a rotational axis. The freewheel hub connects the drive mechanism to the wheel, and the freewheel hub transmits torque from the drive mechanism to the wheel in a first rotational direction around the rotational axis. The locking mechanism has a locked state and an unlocked state. The locked state rotationally fixes a component of the drive mechanism to the wheel relative to the rotational axis.

An automatic free-coasting freewheel (AFF) having: a free-coasting state; an engaged state and a freewheeling state, the AFF comprising: a driving member; an inertial unit; a driven member; a freewheeling biasing member; and an axis of rotation defining an axle; wherein the driving member, driven member and inertial unit are coaxially mounted onto the axle and rotatable thereupon, the driving member configured to controllably rotate relative to the inertia unit; the driving and driven members having angular velocities: ω.sub.DRIVING and ω.sub.DRIVEN; and angular accelerations α.sub.DRIVING and α.sub.DRIVEN; the inertial unit further comprising a suspension member configured with at least one set of: a locking member and a free-coasting biasing member; wherein the inertial unit is configured to interact between the driving and the driven member to automatically shift between the states, depending upon α.sub.DRIVING versus a threshold value (α.sub.MIN) and ω.sub.DRIVEN and ω.sub.DRIVING.

A system and method for simple transmission of a multi-speed bicycle is provided. A bicycle can have a transmission that can be toggled by a kickback shifting mechanism. A rear wheel hub can support a freewheel having a high speed gear sprocket and a low speed gear sprocket with dedicated chains to create dedicated gear-shifting. Rotating the pedal shaft in the non-drive direction approximately one-quarter rotation can toggle the transmission between the first gear ratio and the second gear ratio with a shifting surface that alternately allows driving engagement of the high speed gear sprocket with the rear wheel driver.

A bicycle hub assembly comprises a sprocket support body. The sprocket support body includes at least ten external spline teeth, a base support, and a larger-diameter part. The at least ten external spline teeth are configured to engage with a bicycle rear sprocket assembly. The at least ten external spline teeth radially outwardly extend from the base support. The larger-diameter part extends radially outwardly from the base support. Each of the at least ten external spline teeth has an external-spline driving surface and an external-spline non-driving surface.

A bicycle hub assembly comprises a sprocket support body. The sprocket support body includes at least ten external spline teeth, a base support, and a larger-diameter part. The at least ten external spline teeth are configured to engage with a bicycle rear sprocket assembly. The at least ten external spline teeth radially outwardly extend from the base support. The larger-diameter part extends radially outwardly from the base support. Each of the at least ten external spline teeth has an external-spline driving surface and an external-spline non-driving surface.

A wheel hub assembly for a bicycle is disclosed. The wheel hub assembly may comprise a hub shell for a wheel and coupled to a hub body with an axle by a ratchet mechanism and configured to provide an engaged state where the hub body/axle and the hub shell/wheel rotate together and a disengaged state where the hub body/axle may rotate independently relative to hub shell/wheel; the ratchet mechanism may comprise a set of ratchet rings configured with a set of teeth and sets/groups of pawls configured to engage/disengage the teeth of a ratchet ring; ratchet rings may be configured/installed in the hub body in an aligned condition or an offset condition; when ratchet rings are configured in an offset condition the ratchet mechanism may be configured to facilitate a generally more responsive transition between the disengaged state and the engaged state for the hub body/axle and hub shell/wheel. The wheel hub assembly may comprise a hub shell/wheel and a free hub body/axle coupled by a ratchet mechanism comprising at least one ratchet ring with gear teeth configured to engage a corresponding set/group of pawls so that the wheel and hub body/axle may engage in a power-transmission state such as for forward driven movement; the ratchet mechanism with ratchet rings/pawls may disengage in a free-wheel state. The ratchet mechanism may comprise a ratchet ring arrangement with multiple sets of ratchet rings; with each ratchet ring in offset the number of effective gear teeth per cycle of rotation of the ratchet ring arrangement is greater than the number of gear teeth on each separate ratchet ring; the number of effective gear teeth able to be engaged (e.g. by pawls having a shape/profile to engage from one direction and disengage from one direction with gear teeth during rotation) provides variation of performance characteristics for the wheel hub assembly. A configuration with fewer effective gear teeth may allow for larger gears and greater durability/strength; a configuration with multiple pawls/pawl sets may allow for wider load distribution within the ratchet mechanism; a configuration with multiple offset ratchet rings may allow for improved responsiveness (e.g. within fewer degrees of rotation); a configuration with multiple aligned ratchet rings may allow for greater durability/strength and wider load distribution within the ratchet mechanism. The ratchet mechanism of the wheel hub assembly may be configured for a wide variety of applications, including road biking, mountain biking, electronic bikes. The wheel hub assembly is provided in a compact form/design to allow configuration in a variety of arrangements which can accommodated a variety of different ratc

A wheel hub assembly for a bicycle is disclosed. The wheel hub assembly may comprise a hub shell for a wheel and coupled to a hub body with an axle by a ratchet mechanism and configured to provide an engaged state where the hub body/axle and the hub shell/wheel rotate together and a disengaged state where the hub body/axle may rotate independently relative to hub shell/wheel; the ratchet mechanism may comprise a set of ratchet rings configured with a set of teeth and sets/groups of pawls configured to engage/disengage the teeth of a ratchet ring; ratchet rings may be configured/installed in the hub body in an aligned condition or an offset condition; when ratchet rings are configured in an offset condition the ratchet mechanism may be configured to facilitate a generally more responsive transition between the disengaged state and the engaged state for the hub body/axle and hub shell/wheel. The wheel hub assembly may comprise a hub shell/wheel and a free hub body/axle coupled by a ratchet mechanism comprising at least one ratchet ring with gear teeth configured to engage a corresponding set/group of pawls so that the wheel and hub body/axle may engage in a power-transmission state such as for forward driven movement; the ratchet mechanism with ratchet rings/pawls may disengage in a free-wheel state. The ratchet mechanism may comprise a ratchet ring arrangement with multiple sets of ratchet rings; with each ratchet ring in offset the number of effective gear teeth per cycle of rotation of the ratchet ring arrangement is greater than the number of gear teeth on each separate ratchet ring; the number of effective gear teeth able to be engaged (e.g. by pawls having a shape/profile to engage from one direction and disengage from one direction with gear teeth during rotation) provides variation of performance characteristics for the wheel hub assembly. A configuration with fewer effective gear teeth may allow for larger gears and greater durability/strength; a configuration with multiple pawls/pawl sets may allow for wider load distribution within the ratchet mechanism; a configuration with multiple offset ratchet rings may allow for improved responsiveness (e.g. within fewer degrees of rotation); a configuration with multiple aligned ratchet rings may allow for greater durability/strength and wider load distribution within the ratchet mechanism. The ratchet mechanism of the wheel hub assembly may be configured for a wide variety of applications, including road biking, mountain biking, electronic bikes. The wheel hub assembly is provided in a compact form/design to allow configuration in a variety of arrangements which can accommodated a variety of different ratc