Timex Global Trainer Bike Speed/Cadence Sensor
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.