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2. Bicycle tools - Wikipedia

   en.wikipedia.org/wiki/Bicycle_tools

   Bottom bracket wrench for newer bottom bracket styles Crank extractor. A chain tool or chain splitter is used to 'break' a chain, in order to remove it from a bike or remove links, or to put a chain back together. A crank extractor is used to pull the crank off the bottom bracket spindle. A pedal wrench removes the pedals from the bicycle. It ...

3. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Bottom bracket: The bearing system that the pedals (and cranks) rotate around. Contains a spindle to which the crankset is attached and the bearings themselves. There is a bearing surface on the spindle, and on each of the cups that thread into the frame.

4. Bottom bracket - Wikipedia

   en.wikipedia.org/wiki/Bottom_bracket

   The bottom bracket shell and bottom bracket assembly as a whole have changed drastically as bike frames and part manufacturing continues to evolve. While the progression in technology has led to many new standards which is great for the consumer, [ dubious – discuss ] it has proven to play a challenging role in frame design and aftermarket ...

5. 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.

6. Kogel Bearings - Wikipedia

   en.wikipedia.org/wiki/Kogel_Bearings

   After being frustrated with the bearing qualities offered on premium bicycles, he felt that there was a need for a better ball bearing. The first offering was a line of ceramic bottom brackets available for upgrading or replacing a worn bottom bracket. A complete line of rear derailleur pulleys and wheel bearings were added over time.

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).