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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. 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 ...

4. 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.

5. 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).

6. Spoke wrench - Wikipedia

   en.wikipedia.org/wiki/Spoke_wrench

   A spoke wrench that fits three common nipple sizes. A spoke wrench or spoke key is a small wrench or tool used to adjust the tension in the spokes of a tension-spoked wheel.A spoke wrench is sometimes called a nipple wrench, as it is the spoke nipple – not the spoke – that is turned in the process of changing the tension of a spoke.

7. Precession (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Precession_(mechanical)

   English threaded bicycle bottom brackets are left-threaded on the right-hand (usually drive) side into the bottom bracket shell. This is the opposite of pedals into cranks because the sense of the relative motion between the parts is opposite. (Italian and French threaded bottom brackets have right-hand threading on both sides.)