A bike adapter includes a tube composed of an inner tube and an outer tube which is slidably mounted to the inner tube. Two sleeves are respectively mounted to the inner and outer tubes. Each sleeve has an engaging member so as to release the inner/outer tube from the sleeve corresponding thereto. Two catchers are respectively connected to the inner and outer tubes. Each catcher has a catch end which is coated by a coat. A connection portion is formed to the catch end. Two insertions each have a connection end coated by another coat and has a slot. The insertion is securely inserted through the sleeve. The connection portion of the catcher is detachably engaged with the slot in the connection end of the insertion when moving the sleeves along the tube to form an opening between each catcher and each insertion.

A handlebar stem, in particular for racing bicycle handlebars, comprises a main element which is connected to a handlebar at a front end. The main element is connected to the handlebar stem tube in the area of a rear end. The handlebar stem tube is connectible to a steerer tube such that it is bendable in the longitudinal direction to improve riding comfort.

A bicycle frame assembly including a seat tube having first and second end portions (wherein the seat tube second end portion includes a bend and terminates in a first open end facing a first direction), a down tube having first and second end portions (wherein the down tube first end portion is mounted to the seat tube first end portion, and the down tube second end portion includes a bend and terminates in a second open end facing a second direction opposite to the first direction), and a top tube having first and second end portions (wherein the top tube first end portion is mounted to the seat tube second end portion and terminates in a third open end facing the first direction, and the top tube second end portion is mounted to the down tube second end portion and terminates in a fourth open end facing the second direction).

A bicycle includes a lower frame member and an upper frame member connected to a head tube. The lower frame member includes a down tube, a bottom bracket, and chain stays. The upper frame member includes a top tube, seat stays, and a passage formed in part by a first side wall and a second side wall. The first and second side walls include a first and second openings, respectively. A seat tube extends in an upward direction from the bottom bracket and through the passage. The seat tube includes an opening that extends laterally therethrough. A passive pivot assembly secures the seat tube within the passage, and includes a guide sleeve that extends through the first opening, through the opening in the seat tube, and through the second opening. One or more fasteners secure the guide sleeve to the upper frame member.

Folding bicycle comprising a frame with a front frame portion on which is mounted a front wheel (1) and a rear frame portion (A) on which is mounted a rear wheel (2). The front frame portion includes an upper bar (10), a seat bar (5) and an oblique bar. The rear frame portion comprises at least one seat stay (8), at least one lower bar (9) and the seat bar (5). The oblique bar comprises an upper oblique rod (14) and a lower oblique rod (15). The lower oblique rod (15), the upper oblique rod (14), the upper bar (10) and the seat bar (5) are interconnected by joints (P1, P2, P3, P4), in this order, so as to form an articulated quadrilateral (D) deformable between a folded position and an unfolded position.

Folding bicycle comprising a frame with a front frame portion on which is mounted a front wheel (1) and a rear frame portion (A) on which is mounted a rear wheel (2). The front frame portion includes an upper bar (10), a seat bar (5) and an oblique bar. The rear frame portion comprises at least one seat stay (8), at least one lower bar (9) and the seat bar (5). The oblique bar comprises an upper oblique rod (14) and a lower oblique rod (15). The lower oblique rod (15), the upper oblique rod (14), the upper bar (10) and the seat bar (5) are interconnected by joints (P1, P2, P3, P4), in this order, so as to form an articulated quadrilateral (D) deformable between a folded position and an unfolded position.

A mountain bike comprises: —a frame (10);—a rear wheel (2) having its axle mounted in rear dropouts (16) of the frame;—a front wheel (3) having its axle mounted in front dropouts (18) of the frame;—a pedal set (20) comprising a spindle mounted for rotation in a bottom bracket shell (19) of the frame, two cranks (22) mounted at the opposite ends of the spindle, and two pedals (21) mounted for rotation at the free ends of the respective cranks; wherein each crank (22) has a crank length L of 164 mm or less; wherein the bottom bracket shell (19) has a Practical Bracket Height PBH of 294 mm or less, wherein PBH=BH−β.Math.(α.Math.FST+(1−α).Math.RST), wherein BH indicates bracket height, FST indicates Front Suspension Travel, and RST indicates Rear Suspension Travel.

A mountain bike comprises: —a frame (10);—a rear wheel (2) having its axle mounted in rear dropouts (16) of the frame;—a front wheel (3) having its axle mounted in front dropouts (18) of the frame;—a pedal set (20) comprising a spindle mounted for rotation in a bottom bracket shell (19) of the frame, two cranks (22) mounted at the opposite ends of the spindle, and two pedals (21) mounted for rotation at the free ends of the respective cranks; wherein each crank (22) has a crank length L of 164 mm or less; wherein the bottom bracket shell (19) has a Practical Bracket Height PBH of 294 mm or less, wherein PBH=BH−β.Math.(α.Math.FST+(1−α).Math.RST), wherein BH indicates bracket height, FST indicates Front Suspension Travel, and RST indicates Rear Suspension Travel.

A bicycle with removable battery for supplying power to electric components, comprising a frame composed of an upper tube connected with a front oblique tube and with a rear vertical tube, which in turn are connected in a lower region so as to form a seat for a bottom bracket and with which a pair of horizontal rear chainstays and a pair of oblique rear chainstays are coupled. The front oblique tube has an axial seat for a removable battery and for accommodating connection and/or electric power supply cables. The axial seat has an axis that passes above the bottom bracket and a lower end that is open and located at the interspace between the pair of horizontal rear chainstays.

An aerodynamic front fork assembly for a bicycle may include an elongated crown portion extending from a steerer tube to a distal end behind a front wheel, with one or more fork blades projecting in a generally forward direction from the distal end of the crown portion to engage the front wheel. The crown portion may substantially fill the gap between the front wheel and the down tube of the bicycle, thereby collectively forming an airfoil with the front wheel and the down tube.