2. automatically moving gear(easy paddling)
3. The machine that it tells how many kilo did user ran.
4. item support
5. combine with another bicycle
electric auto-shifting bicycle
One of the more unique aspects of the bicycle, called “Denny,” is an onboard computer that measures resistance and automatically shifts gears based on how hard you are pedaling. Combine that with a front-wheel assist motor powered by a detachable battery, and you’ve got an efficient bike that helps you get up and down hills easily.
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