Aerodynamic bicycle frame
There is provided a bicycle frame comprising a first tube; a second tube extending transversely from an upper region of the first tube; a third tube extending transversely and downwardly from a lower region of the first tube, and towards the same direction as the second tube; and a two-part tube joining the respective ends of the second and third tubes, the two-part tube having a straight upper part and a curved lower part, the straight upper part being substantially vertical and the curved lower part being curved longitudinally towards the first tube such as to conform to the curvature of a bicycle wheel. The upper part of the two-part tube is adapted to receive a post member therein, and a first and a second set of tubes extend at the respective ends the two-part tube and are each attached to drop.
1. A bicycle frame comprising:
a first tube;
a second tube extending transversely from an upper region of said first tube, in a direction;
a third tube extending transversely and downwardly from a lower region of said first tube, and towards a same direction as said second tube; and
a two-part tube joining respective ends of said second and third tubes, said two-part tube having a straight upper part and a curved lower part, said straight upper part being substantially vertical and said curved lower part being curved longitudinally towards said first tube such as to conform to a curvature of a bicycle wheel.
2. The bicycle frame according to claim 1 , wherein said two-part tube is aerodynamically shaped and said upper part is adapted to receive therein a post member.
3. The bicycle frame according to claim 2 , wherein said post member is aerodynamically shaped.
4. The bicycle frame according to claim 1 , further comprising a first set of tubes extending from said two-part tube.
5. The bicycle frame according to claim 4 , wherein said first set of tubes extend from said two-part tube at a junction between said upper and lower parts, said first set of tubes being attached at their other end to dropout means located at a center of the wheel.
6. The bicycle frame according to claim 1 , wherein said upper and lower parts are welded together.
7. The bicycle frame according to claim 1 , wherein said upper and lower parts constitute a one piece member.
8. The bicycle frame according to claim 1 , wherein said upper part forms an angle of about 0 to 20 degrees with the vertical.
9. The bicycle frame according to claim 8 , wherein said angle is about 5 degrees.
10. The bicycle frame according to claim 4 further comprising a second set of tubes extending from a lower end of said two-part tube, said second set of tubes being attached at their other ends to dropout means located at a center of the wheel.
11. The bicycle frame according to claim 4 further comprising brake means removably attached to said first set of tubes.
12. The bicycle frame according to claim 1 further comprising brake means removably attached to said two-part tube at a junction between said upper and lower parts.
13. The bicycle frame according to claim 12 , wherein said brake means includes a brake mounted to a plate.
14. The bicycle frame according to claim 1 , wherein said lower part is transversely curved in both horizontal and vertical planes.
15. The bicycle frame according to claim 4 or 10 , wherein said first and second sets of tubes are each a pair of substantially parallel tubes.