There are two rings of magnets known as the stator and the rotor located inside the direct-drive hub motor of your electric bicycle. When the speed of the motor is lowered, the "teeth" on the rotor and stator may sometimes come into contact with one another, which results in a clicking sound.

The Jetson One is available for sale for $98,000, with an $8,000 deposit. They're still in the testing phase, but senior adviser Rikard Steiber says the company has "hundreds of preorders" and hopes to start having the vehicles hit the skies in the US in less than a year.

The first thing you should know about these noisy e-bikes is that motor noise is totally normal. The second thing is that it's not the only kind of noise your e-bike can make. The third is that there are some things you can do to reduce it.