Shimano FC-R7100 105 double 12-speed chainset, HollowTech II 165 mm 50 / 34T, black

From Shimano:

• Lightweight HollowTech II 105 12-speed chainset
• 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+ 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