Wheels Manufacturing Shimano DM T-TypeCrafted from 7075 aluminum for lightweight and durability Narrow to Wide Tooth Profile Compatible with SRAM T TYPE Chains Fits 9,10 and 11 spd chains, 12spd chains (SRAM Eagle, KMC, SRAM Road and Transmission T Type Flattop chains); Will not work with 13spd Campagnolo chains or 12spd Shimano HG+ chains Attributes Narrow Wide Design Yes BCD Direct Mount Shimano Chainring Comp. Eagle Transmission (T Type) Material 7075 Aluminum Position Single Primary