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...to this day, in air and liquid cooled form. The Mille used a plain bearing crank, like the belt models. ...ven valves|belt driven camshaft engines]], instead of the old ball bearing crank, [[Ducati V-twin motorcycles#Bevel gear driven valves|bevel geared shaft dr

...[[Horstmann suspension]] was a variation which used a combination of bell crank and exterior coil springs, in use from the 1930s to the 1990s.

...charcoal-fired two-cylinder engine, whose connecting rods directly drive a crank on the rear wheel. This machine predates the invention of the safety bicycl ...the four stroke; it consists of only two moving parts--the piston and the crank. A four stroke engine has between six and ten moving parts, depending on th

...system employed a pair of treadle drives connected by rods to a rear wheel crank, rather like a steam locomotive's driveshaft. Although the design was copie ...le makes very little noise, in many countries bicycles must have a warning bell for use when approaching pedestrians, equestrians and other bicyclists.