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Replacement chainrings must be chosen with a bolt-hole count and spacing that matches the spider. Chainrings designed for use with multi-chainring crank arms may have ramps or pins to aid in shifting. The middle chainring, in the case of a triple crankset, usually has the most shaping to aid in shifting up and down.
The Jaffe/Swearingen SA-32T is a prototype American turboprop- powered training aircraft with side-by-side seating. A single example was built in the late 1980s, but no production followed. A single example was built in the late 1980s, but no production followed.
José Meiffret (1913–1983, born Boulouris, France) was a cyclist who set a world motor-paced speed record of 204.73 km/h (127.243 mi/h) behind a Mercedes-Benz 300SL on the German Autobahn on July 19, 1962 [1] at Freiburg Germany. This record was set on a bicycle setup with a 130-tooth chainring, weighing 20 kg and equipped with wooden rims.
Biopace triple crankset, a non-round crankset The Biopace logo on a chainring. Biopace is a tradename for a type of ovoid bicycle chain ring manufactured by Shimano from 1983 to 1993 [1] [2] The design was intended to help overcome the "dead zone" where the crank arms are vertical and riders have little mechanical advantage.