Wheels Manufacturing, Shimano DM T-Type Inboard, Chainring, Teeth: 30, Speed: 12, BCD: Direct Mount Shimano, Single, 7075 Aluminum, Black

Crafted 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