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Amazon.com : Bike Speed & Cadence Sensor for Spin Bike or Road Bike , Wireless Bluetooth/ANT+ IP66, Bike Computer RPM Sensor Compatible with Garmin ,Bryton ,Wahoo IGPS, Black, 38.3*29.8*8.9mm : Sports &
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What are these? And are they related? First 2 pics (Garmin) is on the crank arm and the second pic (Giant ridesense) is on the chainstay on the same side. : r/bikewrench
Garmin Speed sensor, change battery? - YouTube
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