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Aerozine ceramic external bottom bracket bearing cups for BSC/ISO standard, that is M34.798×1.058 mm (1.37″-24 TPI) threads and a 68 mm wide bottom bracket shell. The bottom bracket on a bicycle connects the crankset (chainset) to the bicycle and allows the crankset to rotate freely.
There is a bearing surface on the spindle, and on each of the cups that thread into the frame. The bottom bracket may be overhaulable (an adjustable bottom bracket) or not overhaulable (a cartridge bottom bracket). The bottom bracket fits inside the bottom bracket shell, which is part of the bicycle frame
The bottom bracket shell is a short and large diameter tube, relative to the other tubes in the frame, that runs side to side and holds the bottom bracket. It is usually threaded, often left-hand threaded on the right (drive) side of the bike to prevent loosening by fretting induced precession , and right-hand threaded on the left (non-drive) side.
Some mountain bikes have highly sloped top tubes that limit the size of bottles mounted inside the triangle. Some touring bicycles have a third frame mounting location: under the downtube. Bottle cages may be mounted behind the seat with a bracket that attaches to the seatpost. [2] Some uncommon forks include bottle cage mounts.
The Hollowgram bottom bracket axle is also hollow aluminum and oversized. Cannondale has since made this a free international standard known as BB30. [18] In BB30, the diameter of the bottom bracket spindle is increased from the standard 24mm to 30mm. As a result, the inside diameter of the bottom bracket shell is increased to 42mm.
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