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2. Chain (unit) - Wikipedia

   en.wikipedia.org/wiki/Chain_(unit)

   The chain (abbreviated ch) is a unit of length equal to 66 feet (22 yards), used in both the US customary and Imperial unit systems. It is subdivided into 100 links. [1] [2] There are 10 chains in a furlong, and 80 chains in one statute mile. [2] In metric terms, it is 20.1168 m long. [2]

3. Gunter's chain - Wikipedia

   en.wikipedia.org/wiki/Gunter's_chain

   A quarter chain, or 25 links, measures 16 feet 6 inches (5.03 m) and thus measures a rod (or pole). Ten chains measure a furlong and 80 chains measure a statute mile. [1] Gunter's chain reconciled two seemingly incompatible systems: the traditional English land measurements, based on the number four, and decimals based on the number 10.

4. Bicycle chain - Wikipedia

   en.wikipedia.org/wiki/Bicycle_chain

   Depending on use and cleaning, a chain can last only 1,000 kilometres (600 miles) (e.g. in cross-country use, or all-weather use), 3,000 to 5,000 km (2,000 to 3,000 mi) for well-maintained derailleur chains, or more than 6,000 kilometres (4,000 mi) for perfectly groomed high-quality chains, single-gear, or hub-gear chains with a full cover ...

5. Link (unit) - Wikipedia

   en.wikipedia.org/wiki/Link_(unit)

   The unit is based on Gunter's chain, a metal chain 66 feet long with 100 links, that was formerly used in land surveying. Even after the original tool was replaced by later instruments of higher precision, the unit was commonly used throughout the English-speaking world, for example in the United States customary units and the Imperial system ...

6. Roller chain - Wikipedia

   en.wikipedia.org/wiki/Roller_chain

   Roller chain and sprocket The sketch of roller chain, Leonardo da Vinci, Codex Atlanticus. Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.

7. Chain - Wikipedia

   en.wikipedia.org/wiki/Chain

   Calibrated chain, a type chain where the link lengths are within a given tolerance, so that it reliably engages with a windlass. Flat chain, form of chain used chiefly in agricultural machinery; Ladder chain, a light wire chain used with sprockets for low torque power transmission; Long link chain; O-ring chain, a specialized type of roller chain