Compatibility: Shimano 105 R7150/R7170 Compatibility: Shimano Ultegra R8150/R8170 Compatibility: Shimano Dura-Ace R9150/R9170 Reduced Size: New electric components are more compact Future Potential: May enhance DI2 system capabilities Usage: Ideal for internal routing The Shimano EW-SD300 Di2 12 Speed eTube Wire is compatible with Shimano 12 speed Di2 systems like Shimano 105 R7150/R7170, Shimano Ultegra R8150/R8170, and Shimano Dura-Ace R9150/R9170. Measuring 300 mm, it's suitable for electric components ranging from 150 mm to 650 mm in diameter. This wire is designed to be more compact, reducing the size and weight of new electric components, and may potentially enhance the future capabilities of DI2 systems.