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 HollowTech II allows the bottom bracket bearings to be spaced wider apart (outboard from the frame) 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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