Abstract: A hub structure includes a tubular body defining a hollow cavity. The tubular body includes a first surface and a second surface, the first surface defining a first groove extending along an axial direction of the tubular body. The first groove is defined by an inner sidewall surrounding the hollow cavity, an outer sidewall spaced from and configured to face the inner sidewall, and a bottom surface coupling the inner sidewall and the outer sidewall.

Abstract: The bicycle wheel includes a rim, a hub, a driving device, a plurality of first side pulling spokes, a plurality of first side pushing spokes, and a plurality of second side spokes. The rim has a first side and a second side. The hub is located in a center of the rim. The driving device is connected to the hub which is located on the first side of the rim. Each of the first side pulling spokes and the first side pushing spokes is connected to the rim and the hub, and located on the first side of the rim, respectively. Each of the second side spokes is connected to the rim and the hub, and located on the second side of the rim.

Abstract: The bicycle wheel includes a rim, a hub, a driving device, a plurality of first side pulling spokes, a plurality of first side pushing spokes, and a plurality of second side spokes. The rim has a first side and a second side. The hub is located in a center of the rim. The driving device is connected to the hub which is located on the first side of the rim. Each of the first side pulling spokes and the first side pushing spokes is connected to the rim and the hub, and located on the first side of the rim, respectively. Each of the second side spokes is connected to the rim and the hub, and located on the second side of the rim.

Abstract: A bicycle seatpost includes a first part and a second part. A curvature radius of the first part is r1, and an arc length of the first part is equal to or greater than ?r1 and smaller than 2?r1, the first part is set toward a head of a bicycle. The second part is connected to the first part, wherein a curvature radius of the second part is greater than the curvature radius of the first part, the second part is set toward an end of the bicycle.

Abstract: A seat adjusting module suitable to connect the saddle including at least a seat rail and a seat tube of a bicycle is provided, wherein the module includes a base assembled to an end of the seat tube, a clamp unit including two clamp elements and a fastening unit including two fasteners. The first clamp element has at least a first clamp portion and a shaft portion matched to the base at a first or a second position so as to rotate relatively to the base on a first or a second rotation axis. The second clamp element has at least a second clamp portion, which with the first clamp portion together clamps the seat rail. The two fasteners together fasten the two clamp elements to the base so that the first and second clamp portions together clamp tightly the seat rail.

Abstract: A seat adjusting module suitable to connect the saddle including at least a seat rail and a seat tube of a bicycle is provided, wherein the module includes a base assembled to an end of the seat tube, a clamp unit including two clamp elements and a fastening unit including two fasteners. The first clamp element has at least a first clamp portion and a shaft portion matched to the base at a first or a second position so as to rotate relatively to the base on a first or a second rotation axis. The second clamp element has at least a second clamp portion, which with the first clamp portion together clamps the seat rail. The two fasteners together fasten the two clamp elements to the base so that the first and second clamp portions together clamp tightly the seat rail.