Here's a great quality replacement crank set for your mountain bike or hybrid. This is the Shmano Ty501 alloy crank set. It has steel chain rings in a 42t/34t/24t size range. The arms are comptible with square taper bottom brackets in a 175mm length. A chain guard and crank bolts are not included. Group: Tourney Model: FC TY501 Rear Case Width – Side to Side: 68/73 mm modes: 6/7/8 speed type: Square Compatible: HG 6/7/8 speed chain Large Chain Wheel: Steel Medium Chain Wheel: Steel Small Chain Wheel: Steel Chain line: 47, 5 mm Use: MTB/Trekking