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| 6. BB30 |
| Advantages and Disadvantages |
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BB - common acronym for Bottom Bracket.
New BB designs come out on an always changing market. Two recent examples of this are the BB30 and BB90 units.
The BB30 and BB90 have the spindles attached to the crank arm and a sealed bearing race which sits just inside the BB shell. The design essentially enlarges the frame’s BB shell both in diameter and width to 87 mm (BB30) and 90mm (BB90). The large bearing units are then pressed into the BB shell and the crankset is attached in the same way as an external/outboard bottom bracket system.
