30/46 teeth, 2-speed, 4-arm, bolt circle 104 mm, ISIS bottom bracket 128 mm, black aluminum 7075 T6, with integrated titanium axle, with aluminum crank spider, chainline 47 mm Number of chainrings 2 Type Item main color black large chainring 46 T. small chainring 30 T. crank length 172.50 mm Crankset variation