Lightweight HollowTech II 105 10-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 the CN-5701 chains HollowTech II allows the bottom bracket bearings to be spaced wider apart (outboard from the frame) The system allows for easier installation, adjustment, and maintenance
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