Monitor your pedaling cadence and wheel speed as you ride. You even can use it to train indoors because the sensor attaches to your rear wheel
It measures and reports your pedalling strokes per minute, providing feedback for optimal performance
Buy Garmin Speed/Cadence Sensor Replacement Parts from Chain Reaction Cycles, the online bicycle store for every cyclist.
Red - Black
Blue - Grey
White - Violet
Black - Red
When Buying GPS, , Also Consider...
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