Lightweight hollowtech ii 105 10 speed double chainsetinnovative hollowtech forged and anodised aluminium crank arms utilise a hollow design that minimises flex and keeps the weight lowhollowtech ii allows the bottom bracket bearings to be spaced wider apart outboard from the frame44 enabling the use of larger bearings and an increased axle diameterthe system allows for easier installation44 adjustment44 and maintenancelightweight anodised sg x aluminium chainrings for smooth and prec