c. Components

Brake

Handlebar Brake Levers
Disc Brakes Flat bar Aluminum alloy comfort grip levers with motor cutoff switch 
Tire Seatpost Freewheel
26"*1.95 inches Aluminium alloy, 30mm  7 levels (14-28)
Grips Shift Crankset
R=85mm L=125mm Shimano 7 speed thumb shifter 36 Tooth
Rim Pedal
H=20mm Aluminium Pedal