Originally Posted by baxtefer
IT DOESN'T MATTER WHERE YOU PLACE THE SENSOR!
as long as it's close to the magnet you're fine. All a computer does it count how many times per second the magnet passes the sensor. This is the same number, regardless of where the magnet is mounted on the spoke.
it really does matter tho, if you place the magnet closer to teh hub, the magnet will pass the sensor alot more times, than if the magnet was further out to the circumference.
Its like running in circles, if you run along a big radius you will complete a revolution in a longer time than if you in a shorter radius. Why do you think people cut close to the corners when racing.