The Shimano BB5500 bottom bracket splined ends provide a more rigid, non-loosening crank assembly with 5mm deep spline.
The Shimano BB5500 fits these models of cranks :7700/7703, 6500/6503, 5500/5502/5503/5505, and is also a substitute for previous Ultegra 6500/6503 OL5 bottom brackets
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