Gusset 332 Fixed cog, 3/32-16t, chrome - FCGU316 Cogs: 1.37"x24tpi (right handed) threads, 1/2" x 3/32" teeth (OK for 9sp chain) Lockring (GU-1799): 1.29"x24tpi (left handed) threads, 4-notch tool fitting (sold separately)