This OSPW X system for Shimano GRX RX820 2x12-speed rear derailleurs is built for gravel and cross disciplines and meets the needs for durability, low friction and longevity. The four spring tension settings allow customised setup based on ride conditions, and the handbuilt OSPW System offers custom molded carbon fiber cage for lightweight and durability. CeramicSpeed OSPW Systems reduces friction 35-40% over stock pulley configuration.

• Robust cage crafted from polyamide and carbon fiber for durability and light weight
• Anodized aluminum 5-spoke 13-tooth upper and 19-tooth lower pulley wheels are light weight and durable
• Grade 3 Silicon Nitride ball bearings are 400% smoother, 128% harder and 58% lighter than standard steel balls normally used in the bicycle industry
• 4 customizable spring tension settings for optimal setup
• Compatible with Shimano GRX RX820 2x 12-speed drivetrain only