Shimano FC-S501 Alfine 2-Piece Chainset With Single Chain Guard

The Alfine chainset is a lightweight sleek 2-piece design using the proven external bottom bracket system:

Key Features:

• The 2-piece design is both lightweight and stiff for optimum power transfer
• Built-in single-sided chain guard
• 170 mm crank arm length
• The chainring is for use with 9-speed chains and CS-S500 rear sprocket
• BS thread bottom bracket included for 42.7 mm chain line
• 5-arm 110 PCD