The FSA Super and Pro Road Chainring are compatible with Shimano and SRAM 11 and 10-speed drivetrains. They have been engineered for optimal shifting for both 11 and 10-speed drivetrains. Features: Super Pro rings are weight relieved and precision CNC machined 7075 aluminum with ramps and stainless pins on outer Pro rings are precision CNC machined 7075 aluminum with ramps and stainless pins on outer and middle rings Black/red/white versions match the red and white K-Force graphics Specifications: Teeth: 50, 52T Ring Type: 2x (Outer Ring) Mount/BCD: 5 x 110mm Chain Speeds: 9-11 speed Shape: Round Material: Aluminum Color: Black Weight: -