A bottom bracket assembly with interconnected axle and crank arms. Each end of the axle has a plurality of angled surfaces and a recess formed with a depth through at least the axle perimeter and at least partially around the perimeter of the axle. Each crank arm has a slot formed a distance along the length such that the end of the crank arm is separated into two deflectable jaws. A bore is formed orthogonal to the slot and a fastener is installed in the bore, wherein the fastener has a length to span the slot in the crank arm to engage both deflectable jaws. The fastener has a shank radius that extends to a depth of the recess. Removal of the crank arm from the axle end is opposed when the fastener is in the bore.

A seal for a bicycle drivetrain is configured to shield and protect part of the bicycle drivetrain from contamination by materials commonly found in the cycling environment, namely dirt, oil, water and other debris found on cycling surfaces. The seal is configured to shield the bicycle drivetrain from grit that may foul lockring interfaces, leading to seized threads, and cause difficulty removing the lock ring when it comes time to service the motor or replace the chainring.

A bearing preload adjuster for a bicycle crank set and bottom bracket comprises an adjustment ring for coupling with a bicycle crank arm, a movable plunger comprising an external thread for rotatably coupling with the adjustment ring. The adjustment ring is rotated in order to cause the plunger to extend along an axis of the bottom bracket and apply pressure to a bottom bracket bearing inner race. The adjustment ring is rotated until the clearance in the bearing assemblies and the play in the bottom bracket assembly has been eliminated. This allows the crank assembly to rotate freely, while preventing the crank assembly from sliding side to side inside the bearing bores and along the axis of the crank spindle.

A drive unit for an electrically assisted bicycle includes a housing, a motor in the housing, a crank shaft extending through the housing along a right-left direction of the bicycle, and a pair of bearings rotatably supporting the crank shaft within the housing, wherein each bearing includes an inner ring and an outer ring. The pair of bearings include a first bearing at one side of a thrust direction and a second bearing at another side along the thrust direction, wherein the thrust direction is an axial direction of the crank shaft. The first bearing does not move along the thrust direction relative to the crank shaft. The drive unit has a movement restricting structure that restricts movement of the first bearing relative to the relative to the housing along the thrust direction.

A bicycle frame is discussed having a battery fully contained within a down tube of the bicycle frame. The battery may be inserted into or removed from the down tube via a through opening through a bottom bracket housing of the bicycle frame. Weakness in the bottom bracket housing due to the through opening may be compensated for, fully or partially, by utilizing a bottom bracket bearing assembly that has a structural component, or structural component assembly, that extends completely through the bottom bracket housing and removably couples to the bottom bracket housing.

A sprocket assembly includes a sprocket including a center orifice and a bearing located in the center orifice with an outer part of the bearing fixed in relation to the sprocket. The sprocket assembly also includes a dust cover fixed in relation to an inner part of the bearing. An outer cover diameter of the dust cover is bigger than an outer bearing diameter of the bearing, so that an outer periphery of the dust cover extends radially past the outer part. The sprocket also includes an impeller arranged at the outer periphery of the dust cover. The impeller is fixed in relation to the sprocket.

A rotating bicycle joint assembly includes a rotating joint part, a fixed joint part, and a bearing located between the rotating joint part and the fixed joint part. An outer part of the bearing is fixed in relation to one of the rotating joint part or the fixed joint part. An inner part of the bearing is fixed in relation to the other of the rotating joint part or the fixed joint part. A dust cover has an outer cover diameter that is bigger than an outer bearing diameter of the bearing, so that an outer periphery of the dust cover extends radially past the outer part. The rotating bicycle joint assembly also includes an impeller arranged at the outer periphery of the dust cover. The impeller is fixed in relation to the rotating joint part. The dust cover is fixed in relation to the inner part of the bearing.

A bicycle bottom bracket assembly having a rotational central axis includes a support member, a bearing unit and a radially inward force reducing structure. The support member includes a hanger mounting portion and a bearing mounting portion. The bearing mounting portion is configured to be at least partly positioned within a hanger part of a bicycle frame. The bearing unit includes an outer race, an inner race and at least one roller element disposed between the outer and inner races in a radial direction with respect to the rotational central axis. The outer race is fixed to the bearing mounting portion of the support member. The radially inward force reducing structure reduces a radially inward force being transmitted to the bearing unit.

A bicycle crank assembly comprises a sprocket, a crank axle, a movable member, a torque transmitting member, and a bearing structure. The sprocket has a rotational center axis. The crank axle extends along the rotational center axis. The crank axle includes an internal space. The movable member is movably provided in the internal space to move the sprocket in an axial direction of the rotational center axis. The torque transmitting member is to transmit a pedaling torque from the crank axle to the sprocket. The bearing structure is disposed between the movable member and the crank axle to slidably support the movable member in the axial direction. The bearing structure is disposed at a location different from a location of the torque transmitting member in the axial direction.

A device for adjusting the bearing play of components mounted coaxially rotatable to one another and rotatably joined to one another via two axially separated roller bearings is operatively connected to one roller bearing by an end side and to a counter bearing by the opposing end side. The device is formed by two coaxially adjacent rings on one of the components. Each opposing end surface thereof has at least one contour projecting from the plane of the end surfaces. At least one contour has an incline on which the at least one opposing contour slides. One ring is operatively connected to the counter bearing by the other end surface. The other ring is operatively connected to the roller bearing. A device for mutual radial rotation and a device for locking the axially moving ring in the assumed axial position are on both rings.