Narrow wide chainrings compatible with Race Face CINCH system cranks. Direct mounting allows an easy switch between rings and spiders.Compatible with 9, 10, 11 and 12 speed. Narrow Wide tooth profiling ensures consistent chain retention. Lockring installed/removed with ISIS BB tool. Stiff 4mm plate thickness to transfer loads without flexing. Item Specifications: Direct Mount Type, Direct Mount CINCH, Tooth Count, 30, Drivetrain Speeds, 9,10,11,12, Defined Color, Blue, Material, Aluminum, Ring Position/Type, Chain Retaining Single Ring, Round or Oval, Round, Offset, 3, Chainline/Hub Compatibility, 135/142 MTB Hubs,170/177 Hubs,190/197 Hubs,150/157 DH Hubs,157 Super Boost Hubs,141/148 Boost Hubs,.