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  2. Bottom bracket - Wikipedia

    en.wikipedia.org/wiki/Bottom_bracket

    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.

  3. List of bicycle parts - Wikipedia

    en.wikipedia.org/wiki/List_of_bicycle_parts

    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

  4. Bicycle suspension - Wikipedia

    en.wikipedia.org/wiki/Bicycle_suspension

    The unified rear triangle or "URT" for short, keeps the bottom bracket and rear axle directly connected at all times. Suspension action is provided between the rear triangle, which unites rear axle and bottom bracket, and the front triangle, which unites seat and front axle. This design uses only one pivot, which keeps the number of moving ...

  5. Motobécane - Wikipedia

    en.wikipedia.org/wiki/Motobécane

    French bottom brackets, like Italian ones, used right-hand threading on the fixed cups, making them subject to loosening by precession. Motobécane broke ranks with most other French manufacturers in the mid-70s, using Swiss-threaded bottom brackets (also difficult to find replacement parts for now). Swiss bottom brackets were identical to ...

  6. Bicycle frame - Wikipedia

    en.wikipedia.org/wiki/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.

  7. Crankset - Wikipedia

    en.wikipedia.org/wiki/Crankset

    Even newer designs have the bottom bracket spindle, usually hollow and larger diameter than is possible for bottom brackets with bearings held inside the bottom bracket shell of a bike frame, for reduced weight and increased stiffness, permanently attached to the right crank (Shimano and others) or the left crank (Race Face).

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