Originally Posted by
John Phoenix
I have been using a Bell speedometer. You know the kind with a sensor on the front fork and the magnet mounted to a spoke. Where on the spoke should the magnet be placed for accuracy? Also where on the frame should I put the sensor?
On the sensor, there is a little arrow close to one end - do they mean for me to center the magnet to that arrow?
Should they both be mounted in the center of the spokes/wheel? I feel where on the wheel you place these items due to its circumference will make some difference. Middle, closer to the top of the wheel or closer to the bottom?
The sensor measures the revolutions of the wheel - so whether you put the magnet on the top/bottom/middle of the spoke, it will still passes only once per revolution right?
There are some factors however. If you place the magnet towards the hub, it travels slower during its revlution, so there's less chance of the sensor missing it, skewing your readings. The arrow most likely indicates that you should have the magnet centred over it.