Sram Omnium black track fixed gear single speed crankset. 144BCD. 170mm crankarm length. Comes with Sram Truvativ 48t 1/8" track chainring and Sram GXP BB BSA 1.37×24 bottom bracket. Crankset is in very good condition and has seen very little use. Chainring is barely worn and bottom bracket spins smoothly and without any play. All in all crankset comes in very good condition and is a great bargain.