The Altus FC-M311 crankset for square bottom brackets features a rigid 2-piece construction and Hyperdrive SG-X chainrings. The pre-installed chain guard (optional selectable) keeps your legs and pants clean. The crankset is Dual SIS compatible. Features C
        
    
The Altus FC-M311 crankset for square bottom brackets features a rigid 2-piece construction and Hyperdrive SG-X chainrings. The pre-installed chain guard (optional selectable) keeps your legs and pants clean. The crankset is Dual SIS compatible.
Chainring BCD: Riveted
Hyperdrive SG-X chainrings
Spindle Interface Type: Square Taper JIS
BB Included: No
Chain Compatibility: 3/32″
Crank-FD Type: Mountain Triple
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