2 Pack Bicycle Speedometer Magnet Bike Computer Odometer Wheel Spoke Magnet Waterproof Speed Counting Sensor Universal for Bicycles Tachometer Cycling Riding Replacement Parts

Yeah! My 20 year old bike speedometer is working again. The old magnet just lost magnetism (or whatever magnet power is called). Nice solid metal construction, and strong magnet. Installation couldn't be easier. A little heavier than the original, but not enough that I'll care. Solid construction, should last another 20 years

These work great and saved me from having to get a new bike computer.

A bit big which seems a little inelegant. But, it works well.

Strong magnet activates the sensor from 1/2 inch away. Easy to attach to spoke.

Good replacement if you lost your old odometer magnet, haven't fallen off in the 6 months I've used them and no problems with the computer for accuracy on speed. Quick install too

Runs my speed sensors on my ebikes.

I purchased a Bluetooth cycling dongle a few years ago made by an unnamed cycling company (hint: their name sounds like the cooing sound a mourning dove makes, but twice, ie “cooh cooh”) who sells on Amazon, a device that has separate sensors for reading speed and cadence, but the magnet provided to attach to spoke uses plastic and easily breaks (it’s held to the spoke by twisting the magnetic part manually which is screwed into a nut). This item is a steel component with no plastic used, and tightens with a screwdriver so more pressure can hold it in place on the spoke, making it a great upgrade for the cheaper component provided by the unnamed company above (their dongle works fine, I just wish they included a magnet that’s held to the spoke that didn’t use plastic to attach it).

good design