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2. 420 (dinghy) - Wikipedia

   en.wikipedia.org/wiki/420_(dinghy)

   The International 420 Dinghy is a sailing dinghy popular for racing and teaching. The hull is fiberglass with internal buoyancy tanks. The 420 has a bermuda rig, spinnaker and trapeze. It has a large sail-area-to-weight ratio, and is designed to plane easily. The 420 is an International class recognised by World Sailing. The name refers to the ...

3. Bicycle chain - Wikipedia

   en.wikipedia.org/wiki/Bicycle_chain

   Fixed sprockets and freewheels are also available in 3 ⁄ 32 in (2.4 mm) widths, so fixed-gear and single-speed bikes can be set up to use the narrower and lighter 3 ⁄ 32 in (2.4 mm) chains.) 1 ⁄ 8 in (3.2 mm) chains are typically used on bikes with a single rear sprocket: those with coaster brakes , hub gears , fixed gears such as track ...

4. 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.

5. Sprocket - Wikipedia

   en.wikipedia.org/wiki/Sprocket

   A multi-speed bicycle, by providing two or three different-sized driving sprockets and up to 12 (as of 2018) different-sized driven sprockets, allows up to 36 different gear ratios. The resulting lower gear ratios make the bike easier to pedal up hills while the higher gear ratios make the bike more powerful to pedal on flats and downhills.

6. 470 (dinghy) - Wikipedia

   en.wikipedia.org/wiki/470_(dinghy)

   The 470 (Four-Seventy) is a double-handed monohull planing dinghy with a centreboard, Bermuda rig, and centre sheeting.Equipped with a spinnaker, trapeze and a large sail-area-to-weight ratio, it is designed to plane easily, and good teamwork is necessary to sail it well.

7. 420 World Championships - Wikipedia

   en.wikipedia.org/wiki/420_World_Championships

   The 420 Team Racing World Championship is an sailing regattas in the 420 class organized by the International 420 Class Association and recognised by World Sailing. The 420 (dinghy) has also been used in Youth Sailing World Championships Formerly (IYRU Youth World, ISAF Youth Worlds) and the IYRU Women's Sailing World Championships and in Team ...