Adjustable compliance bicycle
A bicycle including a forward frame triangle. The forward frame triangle can a top tube, a down tube, a bottom bracket, a lower seat mast, and an upper seat mast. The top tube can have a first end connected to a head tube and a second end. The down tube can have a first end connected to the head tube and a second end. The bottom bracket can be connected to the second end of the down tube. The lower seat mast can extend in an upward direction from the bottom bracket to the top tube. The upper seat mast can at least partially overlap the lower seat mast. The upper seat mast can be adjustably and fixedly coupled to the lower seat mast. The upper seat mast can be rotably coupled to the forward frame triangle proximate the second end of the top tube.
1. A bicycle, comprising:
a frame including a head tube;
a lower headset bearing coupled to the head tube and located proximate to a bottom of the head tube;
a cup gimbaled to the head tube proximate to a top of the head tube; and
a fork including a steer tube;
wherein:
the steer tube is located through the lower headset bearing and the cup such that the steer tube is configured to rotate within the lower headset bearing and the cup;
the steer tube is configured flex within the head tube; and
the cup is configured to rotate relative to the head tube in a longitudinal plane.
2. The bicycle of claim 1 , further comprising at least one bearing located within the cup, wherein the steer tube is located through the bearing.
3. The bicycle of claim 1 , further comprising a first pin and a second pin;
wherein;
a first side of the cup is rotably coupled to a first side of the head tube by the first pin; and
a second side of the cup is rotably coupled to a second side of the head tube by the second pin.
4. The bicycle of claim 1 , wherein the cup further comprises a first bearing, a second bearing, and a standoff located between a first inner race of the first bearing and a second inner race of the second bearing.
5. The bicycle of claim 1 , wherein the steer tube is made of carbon fiber.
6. The bicycle of claim 1 , wherein the steer tube is configured to bend in a generally longitudinal direction in response to riding forces.