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Old 08-08-13, 11:42 PM
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Dilberto
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Icarus makes a magnet-based Cadence sensor that fixes inside the rear of your crank spindle opening. The magnet is so strong - the only way to lose it....is to pop it out, with a flat jeweler's screwdriver:

http://www.ebay.com/itm/Icarus-RED-C...item3f25cc82c1
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