31OzeNoVuyL. SL160  Shimano Ultegra 10 Speed Road Bicycle Crank Set   Double   FC 6600 Shimano Ultegra 10 Speed Road Bicycle Crank Set - Double - FC-6600 The Hollowtech II crank and bottom bracket combines race-proven hollow forging technology with the integrated crankset & bottom bracket. Weight is reduced while rigidity & power transfer is radically increased. In addition to Hollowtech II integrated design; the crank arms are hollow which provide amazing strength and rigidity at a light weight. Finally, SG-X chainrings enable super smooth front shifting. Special tooth profiles, pick-up spikes and ramps help make the front derailleur shifts quiet, easy and trouble free for you the rider. 53/39 Teeth.

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