Shimano Dura Ace BB-R9100 Hollowtech II BSA Type Bottom Bracket

Hollowtech II works with 24 mm axles bearings. This gives the greatest possible balance of rotation efficiency, rigidity, strength, and weight in the proven Shimano quality. SPECIFICATIONS: Application: Road Series: Dura Ace R9100 Type: BSA or ITA Shell Width: 68 mm (BSA) or 70 mm (ITA) Axle Diameter: 24 mm (Hollowtech II) TECHNICAL INFORMATION: Bearings: Steel Bottom Bracket Cup Material: Aluminium FEATURES: - small ball bearings keep weight low - bearing cups anodized - recommended for Dura Ace FC-R9100, FC-R9100-P, FC-9000 TECHNOLOGY: Hollowtech II The outboard bearings offer better weight distribution and more stability that provides a more efficient power transfer. The diameter of the bearing axle (24 mm) was an important factor in development because the axle has a positive effect on stiffness, stability, weight, and rotating efficiency. FACTORY NUMBERS: BSA: I-BBR9100B ITA: I-BBR9100I CONTENTS - 1 x Shimano Dura Ace BB-R9100 right bearing cup, bearings included - 1 x Shimano Dura Ace BB-R9100 left bearing shell, bearings included - 1 x Shimano bottom bracket shell