Ultegra HollowTech II chainset offers a fine balance of light weight and rigidity with incredible shifting performance
HollowTech II allows the bottom bracket bearings to be spaced wider apart (outboard the frame) enabling the use of larger bearings and an increased axle diameter
Their is also the benefit of easier installation , adjustment and maintenance
SG-X aluminium anodized chainrings available in 53-39T / 52-39T (FC6600 double), 52-39-30T (FC6603 triple)
Available in 165 mm (double), 170 mm, 172.5 mm, 175 mm
Weight 833g (53 / 39T, 170 mm including bottom bracket)
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