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Information from: www.shimano.com.
Shimano Alfine Comfort Cranks. ALFINE 2-Piece Crankset
Technical Documents
Features
Chainring sizes: 39T, 45T
9-speed compatible chainrings
Use with CN-HG53 super narrow chain
2-Piece crankset with integrated bottom bracket
Chainguard integrated design
Iconic Shimano cap-free design
Specifications
BB Shell Width: 68mm
Bottom Bracket: SM-FC4500
Chain Line: 42.7mm (single) / 49.2 (double)
E-type FD Compatible: yes
Bottom Bracket: included
Chaincase Compatible: no
Chain Guard: single / double
Chainring Bolts & Nuts: stainless steel (bolt), steel (nut)
Inner Chainring: -
Middle Chainring: -
Outer Chainring: aluminum
Crank Arms: aluminum
Crank Arm Length: 170mm
Bolt Circle Diameter: 130mm
Chainring Sizes: 39T / 45T
Chain Compatibility: Super Narrow HG for 9-speed
Crank Construction: 2-Piece
Series: ALFINE
Model Number: FC-S500