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1. Material: metal bearings + ceramic balls
2. Technology: CNC milling, polishing and grinding, anodized dyeing
3. Applicable: 4/5/6MM screw aperture/8/9/10/11 speed shifting system
4. Deep gear guide wheel, can effectively reduce chain drop, change speed dry, more stable chain
5. Ceramic ball self-lubricating and maintenance-free features, smooth rotation and higher transmission efficiency, saving cycling power
6. Bearing reduces friction, suitable for tension/guide sprocket
7. Size:
- 11T: 41 x 9mm
- 13T: 50.5 x 9mm
8. Weight:
- 11T: 7g
- 13T: 8.3g
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