Cateye Speed Magnet cateye Universal
Very good spare magnet
Easy to attach to the spoke, inexpensive. The sensor should be positioned as close to it as possible, otherwise the signal is not read.
It's a magnet!
It´s a magnet that fits onto the spokes of your bicycle, nethertheless, it is a good quality magnet. thankfully BikeInn sell this magnet at its true value,