The sprockets and chain of a bicycle are shown

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Motorcycle Chains & Sprockets

the sprockets and chain of a bicycle are shown

The sprockets and chain of a bicycle are shown in the figure. The pedal sprocket has a radius of 4 in., the wheel sprocket a radius of 2 in., and the wheel a radius.

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This invention relates to sprockets for a bicycle, and more particularly to sprockets which are provided at the outer peripheries thereof with a plurality of teeth in mesh with a driving chain so that a driving force created by pedalling may be transmitted to a rear wheel of the bicycle. Generally, a bicycle is adapted to transmit a driving force by pedalling to a rear wheel at a prescribed speed-change ratio in such a manner that two or more sprockets containing a different number of teeth are combined for mounting to a rear hub or front crank. The driving chain is shifted axially of the sprockets through a rear or a front derailleur so as to be switched to a selected one of the sprockets. A conventional sprocket, however, has teeth whose tips are disposed parallel to the lateral surface of the sprocket body, in other words, along the center line of axial thickness of the body. When the driving chain is shifted by the derailleur for changing the bicycle speed, especially when shifted from a sprocket smaller in diameter and number of teeth to one larger in diameter and number of teeth, a link plate of the driving chain is in contact with a tip of a sprocket tooth causing interference with each other, thereby hindering the chain from meshing quickly and smoothly with the teeth.

This is one of several articles on this site about chain drive. Our table of contents page on gearing and drivetrains lists them, along with other articles on related topics. Cyclists often speak of chain "stretch", as if the side plates of an old chain were pulled out of shape by the repeated stresses of pedaling. This is not actually how chains elongate. The major cause of chain "stretch" is wearing away of the metal where the link pin rotates inside of the bushing or the "bushing" part of the inside plate as the chain links flex and straighten as the chain goes onto and off of the sprockets. If you take apart an old, worn-out chain, you can easily see the little notches worn into the sides of the link pins by the inside edges of the bushings, or the formed side plates of a bushingless chain.

Chat or rant, adult content, spam, insulting other members, show more. Harm to minors, violence or threats, harassment or privacy invasion, impersonation or misrepresentation, fraud or phishing, show more. Yahoo Answers. Help with rpm and bicycles?? The sprockets and chain of a bicycle are shown in the figure.

The sprockets and chain of a bicycle are shown in the figure. The pedal sprocket has a radius of 4 in., the wheel sprocket a radius of 2 in., and.
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The easiest way to calculate sprocket ratio is to count the number of teeth on both the driving and the driven sprockets and divide the first by the second. This ratio tells you how many times the driven sprocket turns for every revolution of the driving sprocket. From this, you can calculate revolutions per minute rpm for the driven sprocket. This is the same way you calculate gear ratio for a gear chain. Unlike a gear train, a sprocket train uses a chain, but the chain does not enter into the calculation of sprocket ratio.



US4181033A - Sprocket for bicycles - Google Patents

Go faster by changing sprockets!

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