RACEWORK 136-section EPT Anti-rust Electric Bicycle Chain Power-assisted Bicycle Chain, Spec: 9-speed1. Hydraulic riveting technology 2. Wear resistance 3. Accurate and flexible shifting performance 4. Special design of mid drive engine 5. Improve the smoothness of shifting 6. Improve shifting performance 7. Alloy material, strong and wear resistant 8. A variety of specifications, you can choose according to your needs 9. Material: steel 10. Compatible: suitable for BOSCH and other types of 8 9 1011 12 speed sports electric bicycle systems 11. Model:
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