Promax CF-2 Two-Piece Crank Set are cold forged from 6061-T6 aluminum to be strong, yet lightweight, CF-2 cranks feature a two-piece design that incorporates a beefy 24-millimeter spindle permanently fitted into the drive-side arm. With a 104-millimeter BCD four-bolt spider, they come in anodised Red, Blue, Gold and Black with laser-etched graphics in 160, 165 and 170-millimeter lengths. Includes a sealed bottom bracket. Meets or exceeds ENBMX standards. Key Features: 6061 T6 alloy 24mm hollow axle 104 BCD Includes sealed bottom bracket