The SHIMANO BB-R9100 bottom bracket provides maximum fluidity and efficiency. This is the most efficient model of the Japanese brand, it corresponds to the level of the Dura-Ace transmission but can be installed on all 10 and 11 speed transmissions of the brand. It has even smoother and more sealed bearings than the previous generation, the size of the bearings has also been reduced in order to gain in lightness. Available here in a version for a 70mm wide Italian case frame.
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