Monitor your pedaling cadence as you ride with the self-calibrating Timex wireless speed/cadence sensor. The unit--which
attaches to the rear half of your bike along the left-side chain stay--determines your pedaling strokes per minute, then
transmits the data to compatible Timex GPS watches, such as the Global Trainer. Want to enjoy an optimal performance
each time you go on a training ride? Look no further than this speed/cadence sensor.