104BCD 4 bolt round chainring, compatible with all 9, 10 and 11 speed chains, SRAM MTB 12 speed chains (Eagle&T-Type),; KMC, Shimano HG+ chains, Shimano HG+ chains.(Eagle&T-Type),; KMC, Shimano HG+ chains.Features:Chainring shape:Round.Offset:0mm.Bcd:104.Chain Compatibility:9, 10 and 11-speed chains, SRAM Eagle and T-Type 12-speed chains, KMC, Shimano HG+ chains.Manufacturer´s weight:39g (30t), 44g (32t), 48g (34t), 57g (36t), 61g (38t).30% longer teeth:Better chain retention, dirt ejection and traction.CNC machined from 7075-T651 Aluminum