Bicycle frame and bottom bracket thereof

A bottom bracket for a frame of a bicycle, wherein the bottom bracket comprises a first joint arm and a second joint arm, a blocking lever, and at least one joint hole which is adapted to receive a bottleneck of at least one compressed air bottle to secure the compressed air bottle to the frame;

• when the at least one compressed air bottle is secured to the frame, the at least one compressed air bottle is located at the rear side of the bottom bracket;
• wherein the first joint arm and the second joint arm are spaced apart from each other;
• the first joint arm and the second joint arm are respectively connected to two chain stays;
• the at least one joint hole is disposed between the first joint arm and the second joint arm;
• wherein the blocking lever is disposed between the first joint arm and the second joint arm;
• the two side portions of the bottom bracket are respectively connected to the first joint arm and the second joint arm;
• after being secured to the frame, part of the compressed air bottle is located within a space enclosed by the blocking lever, the first joint arm and the second joint arm.

A frame for a bicycle, which includes a head tube, a connection member, a bottom bracket, and two chain stays, wherein the connection member connects the head tube to the bottom bracket, while one end of each of the two chain stays is connected with the bottom bracket;

• in a forward direction of the bicycle, the head tube is located at a front side of the bottom bracket, while the two chain stays are located at a rear side of the bottom bracket;
• wherein the frame comprises:
• the bottom bracket including a first joint arm, a second joint arm, and at least one joint hole which is adapted to receive a bottleneck of a compressed air bottle to secure the compressed air bottle to the frame;
• when the compressed air bottle is secured to the bottom bracket, the compressed air bottle is located at the rear side of the bottom bracket;
• wherein the first joint arm and the second joint arm are spaced apart from each other;
• the two chain stays are connected to the first arm and the second arm of the bottom bracket;
• the at least one joint hole is disposed between the first joint arm and the second joint arm;
• wherein a length of the first joint arm is not equal to that of the second joint arm.