A gear-shifting system (10)(10') for a power-assisted bicycle (90) includes: a power supply module (11); a microcomputer (21)(21'); a gear-shifting driver (31); and a pedal position sensing module (41) for detecting an angular position of a crank (95) of t...

A reverse brake mechanism (10) for an electrically assisted bicycle includes a crankshaft (40). When the crankshaft (40) is rotated forward, it causes a drive ring (50) to rotate the chainwheel (30) forward and then causes the chainwheel (30) and the drive...

A power-assisted bicycle(10)(60) includes a bicycle body (11) with a power assistance provider (12) and a derailleur (16), a microcomputer (21), a gear-shift control driver (31), and sensors (41). When the microcomputer (21) decides to perform gear shiftin...