Abstract: A bicycle crank axle assembly has first and second crank arms that are attached to opposite ends of a crank axle. The ends of the crank axle are non-rotatably disposed in axle mounting openings of the first and second crank arms. A first end of the crank axle has at least one axially extending first spline that protrudes radially outward from an outer peripheral surface of its middle body portion. The at least one axially extending first spline non-rotatably couples the crank axle to the first crank arm and prevents outward axial movement of the first crank arm away from the second crank arm. The second end portion of the crank axle has at least one recess that extend radially inward with respect to the outer peripheral surface of the middle body portion to form at least one axially extending second spline.

Abstract: A bicycle bottom bracket assembly is provided with a support member, a bearing unit and a seal member. The support member includes a hanger mounting structure and a bearing mounting structure. The bearing unit includes an outer race, an inner race and at least one roller element disposed between the outer and inner races. The outer race is fixed to the bearing mounting structure of the support member. The seal member has a proximal end fixed to the support member and a distal end slidably contacting the inner race of the bearing unit.

Abstract: A bicycle bottom bracket assembly is provided with a support member, a bearing unit and a seal member. The support member includes a hanger mounting structure and a bearing mounting structure. The bearing unit includes an outer race, an inner race and at least one roller element disposed between the outer and inner races. The outer race is fixed to the bearing mounting structure of the support member. The seal member has a proximal end fixed to the support member and a distal end slidably contacting the inner race of the bearing unit.

Abstract: A bicycle crank assembly is provided with a crank arm and an axial gap adjustment device. The crank arm has a crank axle mounting part, an extension part extending from the crank axle mounting part, a pedal attachment part provided on a radial outer end of the extension part and a sprocket attachment part. The axial gap adjustment device includes an adjustment adapter and an adjustment member. The adjustment adapter has a crank arm engagement structure that non-rotatably engages the crank arm, a first crank axle opening, and a first screw part. The adjustment member has a second crank axle opening, and a second screw part threadedly engaged with the first screw part to selectively position the adjustment member relative to the adjustment adapter.

Abstract: A bicycle crank assembly is provided with a crank arm and an axial gap adjustment device. The crank arm has a crank axle mounting part, an extension part extending from the crank axle mounting part, a pedal attachment part provided on a radial outer end of the extension part and a sprocket attachment part. The axial gap adjustment device includes an adjustment adapter and an adjustment member. The adjustment adapter has a crank arm engagement structure that non-rotatably engages the crank arm, a first crank axle opening, and a first screw part. The adjustment member has a second crank axle opening, and a second screw part threadedly engaged with the first screw part to selectively position the adjustment member relative to the adjustment adapter.

Abstract: A bicycle chainring is formed from a first member and an second member. The first member includes a center rotational axis, a crank attachment portion with a plurality of chainring attachment openings and an annular tooth portion with a plurality of chain engaging gear teeth. The second member disposed around the center rotational axis and is fixedly attached to overlie at least one of the crank attachment portion and the annular tooth portion to reinforce the first member without obstructing access to the chainring attachment openings.

Abstract: A bicycle crank assembly is configured to simplify the work required to adjust the bearing play by the crank assembly when the crank assembly is mounted. The bicycle crank assembly has a left crank that is mounted on a crank axle of the bicycle, and is provided with a crank body and an adjustment member. The crank body includes a crank axle mounting part non-rotatably mounting to one end of the crank axle, an arm part extending from the crank axle mounting part, a pedal mounting part for mounting the pedal and provided at the tip of the arm part, and a male screw part formed on the crank axle mounting part. The adjustment member includes a tubular part having a female screw part into which the male screw part is screwed, and a contact part formed at one end of the tubular part and capable of contacting the bearing supporting the crank axle.

Abstract: A bicycle bottom bracket assembly is provided with a pair of bearing support members, and a pair of axle bearings so that the bottom bracket assembly is configured and arranged to be mounted into a hanger part of a bicycle frame. The hanger part has opposite open ends. The bearing support members are press-fitted into opposite open ends of the hanger part. The bearings are retained in the bearing support members such that the bearings are disposed inside of the hanger part with outer races of each of the bearings engaging one of the bearing support members. A crank axle is rotatably supported within the hanger part by inner races of the bearings with a first axial end portion of the crank axle being disposed at one end of the hanger part and a second axial end portion of the crank axle being disposed at the other end of the hanger part.

Abstract: A bicycle chain wheel assembly is provided with a chainring mounting structure, at least one chainring, a plurality of fasteners and a plurality of fastener covering structures. The chainring mounting structure has an exterior facing side and an interior facing side with a plurality of chainring mounting openings on the exterior facing side. The chainring overlies one of the exterior and interior facing sides of the chainring mounting structure. The fasteners secure the chainring to the chainring mounting structure via the chainring mounting openings. The fastener covering structures overlie exterior portions of the fasteners to conceal the fasteners from view when viewed from the exterior facing side of the chainring mounting structure.

Abstract: A bicycle chain wheel assembly is provided with a chainring mounting structure, at least one chainring, a plurality of fasteners and a plurality of fastener covering structures. The chainring mounting structure has an exterior facing side and an interior facing side with a plurality of chainring mounting openings on the exterior facing side. The chainring overlies one of the exterior and interior facing sides of the chainring mounting structure. The fasteners secure the chainring to the chainring mounting structure via the chainring mounting openings. The fastener covering structures overlie exterior portions of the fasteners to conceal the fasteners from view when viewed from the exterior facing side of the chainring mounting structure.

Abstract: A bicycle bottom bracket assembly is provided with a pair of bearing support members, and a pair of axle bearings so that the bottom bracket assembly is configured and arranged to be mounted into a hanger part of a bicycle frame. The hanger part has opposite open ends. The bearing support members are press-fitted into opposite open ends of the hanger part. The bearings are retained in the bearing support members such that the bearings are disposed inside of the hanger part with outer races of each of the bearings engaging one of the bearing support members. A crank axle is rotatably supported within the hanger part by inner races of the bearings with a first axial end portion of the crank axle being disposed at one end of the hanger part and a second axial end portion of the crank axle being disposed at the other end of the hanger part.

Abstract: A bicycle crank assembly is configured to simplify the work required to adjust the bearing play by the crank assembly when the crank assembly is mounted. The bicycle crank assembly has a left crank that is mounted on a crank axle of the bicycle, and is provided with a crank body and an adjustment member. The crank body includes a crank axle mounting part non-rotatably mounting to one end of the crank axle, an arm part extending from the crank axle mounting part, a pedal mounting part for mounting the pedal and provided at the tip of the arm part, and a male screw part formed on the crank axle mounting part. The adjustment member includes a tubular part having a female screw part into which the male screw part is screwed, and a contact part formed at one end of the tubular part and capable of contacting the bearing supporting the crank axle.

Abstract: A bicycle chainring is formed from a first member and an second member. The first member includes a center rotational axis, a crank attachment portion with a plurality of chainring attachment openings and an annular tooth portion with a plurality of chain engaging gear teeth. The second member disposed around the center rotational axis and is fixedly attached to overlie at least one of the crank attachment portion and the annular tooth portion to reinforce the first member without obstructing access to the chainring attachment openings.

Abstract: A bicycle crank axle bearing assembly includes a pair of first and second axle support members, a pair of first and second bearings and a lock nut. The first and second axle support members include first and second mounting sections with first and second male screw parts that are configured and arranged to be non-rotatably coupled to a hanger part of a bicycle frame, and first and second bearing retaining sections in which the first and second bearings are retained to rotatably support a crank axle. The lock nut is disposed at least one of the first and second male screw parts of the first and second axle support members to retain an axial position of the at least one of the first and second support members with respect to the hanger part.