DESCRIPTION

Features Hollowtech crank arm construction - made possibleby advancedShimano forgingTechnology,These forged hollow crankarms increasestrength and rigidity while reducing weight. Specially designed chainrings deliverquick and precise shifting withThe super-narrow 9 speed chain. Four arm design reduces weight while offering increased lateral rigidity. Hollow forged aluminum Bottom bracket is not included Approximate weight 635 grams Compatible withShimano Octalink V2 splined bottom brackets, u