Review on Stay Ahead of the Game with the Waterproof Wireless Bicycle Speedometer - LCD Display & Multi-Functions by John Ghattamaraju

Congratulations, you've just bought a frustrating watch. I consider myself a pretty capable guy and used to put speedometers on bikes. You don't need a PhD to understand instructions, but it would be nice to have one if you're developing. The monitor must be mounted less than 24 inches from the receiver. And on a kid's bike, which can work just fine, but anything over 24 inches, the monitor needs to be mounted too high on the spokes for the magnet to touch. And on a kids bike that might work fine, but anything over 24 inches should have a monitor. too far on the connectors for the magnet to touch them. If you install it farther on the forks of large bikes, the monitor will be too far from the receiver.