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.
- HOLLOWTECH II crankset: Optimum balance of lightweight and rigidity.
- Smoother rolling: Minimal bearing interface for smoother rolling.
- Hyperdrive compatible (SG-X chainrings)
- DUAL SIS compatible
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Shimano 105 FC-5603-L Hollowtech II Crack Set - Triple