A. Structure of the power-assisted bicycle
1. Tyre and inner tube
2. Wheel rim
3. Spokes
4. Front hub with clamping nut
5. Front fork
6. Brake caliper
7. Front mudguard
8. Handlebar and stem
9. Bell
10. Gear change lever
11. White battery-operated front
light
12. Frame
13. Pedal
14. Chain set
15. Chain guard
16. Quick-release clamp
17. Seat post
18. Seat
19. Chain
20. Rear hub and electric engine
21. Derailleur (transmission)
22. Kickstand
23. Rear mudguard
24. Rear luggage rack
25. Battery, switch and lock
26. Charger port
27. Tail-light
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