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A gear change mechanism for a bicycle may involve a tensioner that has a wheel engaged with a chain in a bicycle drivetrain. This tensioner may be configured to rotate or otherwise change orientation in response to slack in the chain to maintain tension in the chain. A sensor may be used to measure

A gear change mechanism for a bicycle may involve a tensioner that has a wheel engaged with a chain in a bicycle drivetrain. This tensioner may be configured to rotate or otherwise change orientation in response to slack in the chain to maintain tension in the chain. A sensor may be used to measure the orientation of a tensioner of a chain in a bicycle drivetrain, and/or the physical orientation of components indicative thereof. Actions may be triggered by signals generated by the sensor.

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1. A gear change mechanism for a bicycle operated with a plurality of sprockets driven by a chain, the gear change mechanism comprising: a base member configured for mounting to the bicycle;a link mechanism pivotably connected to the base member;a moveable member pivotably mounted to the link mechan

1. A gear change mechanism for a bicycle operated with a plurality of sprockets driven by a chain, the gear change mechanism comprising: a base member configured for mounting to the bicycle;a link mechanism pivotably connected to the base member;a moveable member pivotably mounted to the link mechanism such that the moveable member is movable in an axial direction relative to the base member;a chain guide configured to engage and guide the chain; anda sensor configured to determine an angle of the chain guide relative to the moveable member. 2. The gear change mechanism of claim 1, wherein the chain guide comprises: a pivot member rotatably mounted to the moveable member and configured to rotate about a first axis of rotation;a first wheel configured to interface with the chain and rotate about a second axis of rotation; anda positioning member extending between and connecting the pivot member and the first wheel. 3. The gear change mechanism of claim 2, wherein the positioning member is rigidly connected to the pivot member. 4. The gear change mechanism of claim 3, wherein the chain guide further comprises a second wheel configured to interface with the chain and rotate about a third axis of rotation. 5. The gear change mechanism of claim 4, wherein the third axis of rotation is the same as the first axis of rotation. 6. The gear change mechanism of claim 2, wherein the sensor is configured to determine an angle of rotation of the pivot member about the first axis of rotation. 7. The gear change mechanism of claim 2, wherein the sensor is configured to detect an angular position of a magnet. 8. The gear change mechanism of claim 7, wherein the sensor is a magnetic rotary encoder. 9. The gear change mechanism of claim 7, wherein the sensor is mounted on the moveable member or the pivot member. 10. The gear change mechanism of claim 9, wherein the magnet is disposed on the other of the pivot member or the movable member. 11. The gear change mechanism of claim 9, wherein the magnet is disposed on an end of the pivot member. 12. The gear change mechanism of claim 1, wherein the chain guide further comprises a biasing device coupled with the chain guide and configured to maintain a tension in the chain. 13. The gear change mechanism of claim 12, wherein the biasing device is fixably attached to the moveable member and the chain guide. 14. The gear change mechanism of claim 1, further comprising: a processor in operative communication with the sensor, wherein the sensor is further configured to communicate a signal indicative of the angle. 15. The gear change mechanism of claim 14, further comprising: a motor operatively coupled to the link mechanism to move the movable member along the axial direction, and wherein the processor is configured to provide a command signal to the motor in response to the signal indicative of the angle. 16. A method of drivetrain management for a bicycle driven by a chain operating over a plurality of sprockets, the method comprising: determining, with a sensor, an angle of a tensioner chain contact relative to a tensioner mount, the tensioner chain contact configured to maintain a tension in the chain; anddetecting, by a processor in communication with the sensor, a change in the angle of the tensioner chain contact. 17. The method of claim 16, wherein the tensioner chain contact is a tensioner wheel having a center disposed a distance from a pivot member having a first axis of rotation, the tensioner wheel being configured to rotate about the first axis of rotation and a second axis of rotation to interface with the chain so as to maintain a tension in the chain. 18. The method of claim 17, wherein the tensioner wheel is connected to the pivot member with a rigid member, and the determining the angle of the tensioner wheel comprises measuring, with the sensor, a rotational orientation of the pivot member. 19. The method of claim 18, wherein the measuring the rotational orientation of the pivot member comprises measuring a rotational orientation of a magnet attached to the pivot member. 20. The method of claim 19, wherein the measuring the rotational orientation of the magnet attached to the pivot member comprises measuring a rotational orientation of the magnet attached to a distal end of the pivot member. 21. The method of claim 16, further comprising: communicating, by the processor, a control signal to an electric motor in response to the detecting the change in the position of the tensioner chain contact. 22. A chain tensioner for a bicycle operated with a plurality of sprockets driven by a chain, the chain tensioner comprising: a tensioner mount configured to be attached to a bicycle;a pivot member rotatably mounted to the tensioner mount and configured to rotate about an axis of rotation;a chain interface structure comprising: a chain interface component configured to maintain contact with the chain, anda positioning member extending between and connecting the pivot member and the chain interface component;a biasing device coupled with the chain interface structure and configured to maintain a tension in the chain; anda sensor configured to determine an angle of the chain interface structure relative to the tensioner mount.