2pcs bicycle rear derailleur, derailleurs, jockey wheel bike guide roller pulley, ceramic bearings, bicycle derailleur accessories 11t (red) river-cj <p>anodized cnc machined bicycle jockey wheel with fully rubber sealed bearing for center bolt derailleurs. fits for most of rear derailleur on the market, support 7/8/9/10 speed.if you need it will be your best choice. wish you a happy life!</p> <p>features:</p> <p>1. it is made of cnc aluminum alloy, lightweight and durable.</p> <p>2. anti rust and corrosion resistant anodized.</p> <p>3. apply for most of rear derailleur on the market, support 7/8/9/10 speed.</p> <p>specifications:</p> <p>material: 7005 aluminium alloy</p> <p>components: derailleurs</p> <p>structure: ceramic bearings</p> <p>color: red</p> <p>size: 11t</p> <p>use: for 7/8/9/10 speed</p> <p>diameter: 11t-40mm</p> <p>quantity: 2pcs</p> <p>fit for: for 4/5/6mm roller screw axis</p> <p>package included:</p> <p>2 pcs ceramic bearings</p>