21-Speed MTB Drivetrain Gear System (Aftermarket)

Upgrade your bicycle with the Generic 21-Speed Gear System, designed for smooth shifting, reliable performance, and everyday MTB riding. This complete drivetrain kit offers excellent value for riders looking to replace or upgrade their gear system.

Key Features:

✔ Complete 21-speed drivetrain kit
✔ Smooth and reliable gear shifting
✔ 3×7 speed configuration
✔ Durable crankset and chain
✔ Precision front & rear derailleurs
✔ Ergonomic EZ-Fire shifters
✔ Strong freewheel for long service life
✔ Ideal for MTB and hybrid bikes