Cycle cranks, cycles, methods of measuring a cycle crank angular position
A cycle crank includes a first portion for attachment to a cycle and a second portion spaced from the first portion for attachment to a pedal; wherein the crank includes a sensor for determining, in use, a value representative of a force applied to the crank; an angular rate sensor for determining, in use, the angular rated of rotation of the crank; and a processor for determining the angular position of the crank from the determined angular rate of rotation and associating the position with its corresponding value representative of a force applied to the crank.
1. A cycle crank comprising:
at least one crank arm, each crank arm comprising:
a sensor for determining, in use, a value representative of a force applied to said crank arm during a revolution of said crank arm; and
a wireless transmitter;
wherein said at least one crank arm is configured to operate in a first, low speed mode of operation in a first frequency range, in a second, medium speed mode of operation in a second frequency range, and in a third, high speed mode of operation in a third frequency range;
in said second mode of operation the wireless transmitter of said crank arm communicates at a higher rate of transmission than in the first mode of operation; and
in the third mode of operation the wireless transmitter of said crank arm communicates at a higher rate of transmission than in the first and second modes of operation.
2. A cycle crank according to claim 1 , wherein the first frequency range comprises frequencies lower than 10 Hz.
3. A cycle crank according to claim 2 , wherein the second frequency range comprises frequencies of 10 to 150 Hz.
4. A cycle crank according to claim 3 , wherein the third frequency range comprises frequencies of 150 Hz and greater.