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I just got a Garmin GSC10 cadence/speed sensor for my bike ... don't have a pproper bike computer so thought this was the easiest way, by linking up to my "running" Garmin watch. I need to set the wheel size on the watch to get the calibration correct ... I'm assuming this is based on where the sensing magnet ends on the wheel and not the actual wheel size. Bit confused as some forum messages seem to suggest using actual wheel size which doesn't make sense to me ... presume the device calculates wheel rpm and then converts to distance.