More durable chainring than the standard RD Track Crank. Cold-forged aluminum arms. Available in silver arms with black chainring for 1/8" chain (pictured), black arms with black chainring for 3/32" chain. 130BCD. 46T. Crankset with silver arms has 1/8" chainring. Crankset with 3/32" chainring has black arms, black ring, and is $20.00 more. JIS square taper bottom bracket, 103mm spindle length recommended for 42mm chainline.