The 6600 bottom bracket is one piece in Shimano's Ultegra line of bicycle components. The bottom bracket is installed into the hollow shell at the bottom of the bicycle frame and allows for the attachment of the pedal cranks to the bicycle. A 6600 bottom bracket consists of two cups attached to either end of a hollow cylinder. Each cup houses a sealed bearing cartridge, which allows the crank and its spindle to rotate smoothly and deliver maximum power to the rest of the drive train.
- Skill level:
Things you need
- Bicycle grease
- Shimano TL-FC32 bottom bracket wrench
Use a rag and wipe the bottom shell clean of any old grease or other matter that might affect contact between the bottom bracket threads and the shell.
Apply fresh grease to the rag. Use the rag and grease to lubricate the threads inside the bottom bracket shell.
Detach the left side cup from the Shimano Ultegra 6600 bottom bracket. The left side cup is marked with an "L." The right side cup is marked with an "R." Set the left side cup aside for now.
Apply grease, using the rag, to the right side bottom bracket cup threads.
Insert the right side cup, and the hollow cylinder to which it is attached, through the right side bottom bracket shell on the bottom of the bicycle frame.
Turn the right side cup by hand, counterclockwise, to tighten. Continue to tighten by hand until it becomes difficult.
Attach the Shimano TL-FC32 bottom bracket wrench to the right side cup. Turn the wrench handle counterclockwise to fully tighten the cup.
Apply grease to the left side bottom bracket cup threads.
Attach the left side cup to the left side bottom bracket shell. Turn the cup by hand, clockwise, until it becomes difficult.
Attach the Shimano TL-FC32 bottom bracket wrench to the left side cup. Rotate the wrench handle clockwise until the left side cup is fully tightened.
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