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Compatibility Any Race Face Cinch™ system crankset. Wolf Tooth’s patented Drop-Stop® wide/narrow tooth profile for the ultimate chain retention and mud shedding ability Both standard (142mm rear hub spacing) and Boost (148mm hub spacing) offsets available. If using a 9-speed drivetrain use a 10-speed chain (shifts and works well on a 9-speed drivetrain and fits the ring tighter for better chain retention). Chainline Standard Offset 49mm for 26-34t, 51mm for 36t for additional chainstay clearance Boost Offset 52mm Available in two different tooth profiles for optimal performance based on your chain type. Use Drop-Stop ST for use with Shimano 12-speed Hyperglide+ chains. Use Drop-Stop A for all 9, 10, and 11spd chains or 12spd SRAM Eagle, KMC, Connex or Wippermann chains.