Triple chainset with 30/39/50 rings.
10 speed compatible.
HollowTech forged aluminium crank arms are hollow which reduces flex and weight.
HollowTech II allows the bottom bracket bearings to be spaced wider apart (outboard cups), enabling the use of larger bearings and a large diameter axle.
Lightweight anodised SG-X aluminium chainrings for smooth and precise shifting.