Join Date: Jul 2008
Location: North Bergen, NJ
Bikes: '80 Windsor Carrera Sport, '02 Specialized Sirrus A1, '10 Giant Escape 2
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Yeah it just counts the revolutions of the crank (same as for the wheel)-- tick, tick, tick, ... (<<=== these are silent internal ticks, one per revolution, each time the magnet passes the sensor). The closer together the ticks are, the faster your crank (or your wheel) is turning. For cadence, the computer is just figuring out RPMs.
I thought you were posting a question about how to set your wheel diameter/circumference, so the computer can figure out speed and distance properly. The computer counts RPMs for your wheel as well. If it knows the correct circumference, 'C', of your wheel, it can figure out how far and how fast you're going, since each revolution of your wheel correlates to C distance traveled.