Originally Posted by
pdlamb
Err, in a word, no. The magnet passes the sensor once every time the wheel turns around.
It may be advantageous to put the magnet and sensor fairly close to the hub. Close to the hub the spokes are nearer the frame, so the magnetic field is stronger at the sensor. Also, when the magnet is nearer the hub, the sensor has longer to respond before the magnet leaves the sweet spot.
OK, you are right, lol. Stupid me. The magnet still passes once for every one revolution of the wheel, so it is all about tire circumference. I guess I can't math and ride a bike at the same time.
I wonder if I can delete this embarrassing thread?