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Monitor your speed as you ride with Garmin's easy-to-install wireless sensor. The speed sensor attaches to the hub of either wheel and self-calibrates with your Garmin device to give you accurate speed and distance at all times. Read more..
With no magnets or other exposed parts to line up, this sensor is easy to install, maintain, and move between bikes. Simply attach the sensor and ride- works indoors on your trainer as well!