Shimano Dura-Ace 7900 B-Type Inner Chainring (130mm BCD) (Offset N/A) (39T) - Y1KY39000
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Shimano Dura-Ace 7900 B-Type Inner Chainring (130mm BCD) (Offset N/A) (39T) - Y1KY39000, Shimano Dura-Ace 7900 10-Speed Chainrings Features: B-Type, for use with 52 or 53 tooth B-type outer chainrings Designed for use with 10-Speed asymmetrical Shimano road chains: CN-7901, CN-6711 and CN-5701 Specs: Tooth Count39 Ring Position/TypeInner Drivetrain Speeds10 Chainring BCD130 ColorSilver/Black Defined ColorSilver MaterialAluminum