Smoother than ever. Extended inner plate improves chain engagement and retention, while reducing shift times and pedaling shock. This proprietary design ensures smooth shifts and strength against everything a performance ride can throw at it.* Compatible with 12 speed drivetrain.* Sil-Tec and chromizing treatment for increased durability.* SM-CN910-12 Quick-link for easy chain connecting & removal.* E-Bike compatible.* 252g.