Carbon Fiber Rear Derailleur Pulley Guide Wheel for Shimano Ultegra R8000/6870/6800/Dura-Ace 9070/9000 - SD1 Black • Premium Construction: The derailleur pulley features a lightweight carbon fiber frame combined with 7075 aluminum alloy pulleys, offering exceptional strength and durability without compromising on weight • Precision CNC Machining: Expertly crafted with CNC cutting technology for precise fitment and performance. The anodized finish enhances corrosion resistance, ensuring long-lasting performance and a sleek appearance • Wide Compatibility: Designed to fit 20-inch and larger road or folding bikes, this pulley system is compatible with Shimano series such as 6800, 6870, 9000, 9070, and 8000, making it versatile for a wide range of high-performance setups • Enhanced Shifting Efficiency: The pulley wheels provide smooth and efficient gear changes, improving overall shifting accuracy and reducing friction during intense cycling sessions Specifications: • Material: Carbon fiber frame + 7075 aluminum alloy pulley • Process: CNC cutting, anodizing • Applicable models: 20-inch road/folding bikes Package included: • 1 x Pulley Guide Wheel