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New Ultegra Hollowtech II chainset offers the optimum 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 aluminum anodized chainrings including Bottom Bracket)
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Accessories
Bolts
