Epicyclic gear train
Epicyclic gearing or planetary gearing is a gear system consisting of one or more outer gears, or planet gears, revolving about a central, or sun gear.
Electronic bikes - Electronic bikes are new technology & obviously consume energy.
HP Velotechnik Gekko / fx / fx 26 brochure english, EUR
HP Velotechnik Gekko / fx / fx 26 brochure english, USD
