• This pulley bike made of CNC aluminum alloy, the jockey wheel is solid and lightweight. Metal bearings ensure durability
• Antioxidant and anodized resistant, reduce friction, increase durability, for prolonged use
• Ensures perfect tension for your bike chain to make you pedal with less efforts
• It is a great accessory for driving enthusiasts

Specification:

• Material: Aluminum Alloy + Metal
• Process: CNC fully hollow anodizing
• Applicable: 4/5/6mm screw hole diameter rear derailleur to 8/9/10/11 speed, suitable for almost all mountain road rear derailleurs