The FC-R7100 delivers smooth, precise shifting and efficient power transfer for your 12-speed drivetrain. Specification: Lightweight & Stiff: Hollow forged aluminum crank arms minimize weight without sacrificing rigidity. Hyperglide+ Shifting & Durable Efficiency: Experience crisp gear changes with optimized chainring design, while wider bottom bracket bearing placement improves power transfer and longevity. Easy Maintenance & Clean Aesthetics: Compatible with Shimano external or press-fit bottom brackets, featuring anodized aluminum chainrings for a sleek look. Technical Specs: 110 BCD (Bolt Circle Diameter) 148mm Q-factor 44.5mm chainline Additional: Innovative HollowTech forged and anodised aluminium crank arms utilise a hollow design that minimises flex and keeps the weight low The chainring teeth have been developed to work in conjunction with Hyperglide; plus 12-speed chains for increased contact to provide greater efficiency and improved power transfer HollowTech II allows the bottom bracket bearings to be spaced wider apart, enabling the use of larger bearings and an increased axle diameter Can be used with Shimano external or press-fit bottom brackets The system allows for easier installation, adjustment, and maintenance Lightweight anodised aluminium chainrings for smooth and precise shifting Genuine, brand new, boxed Shimano product - Biketart are an official UK Shimano stockist.