
A swingarm, or `swinging arm` (UK), originally known as a swing fork or pivoted fork, is the main component of the rear suspension of most modern motorcycles and ATVs. It is used to hold the rear axle firmly, while pivoting vertically, to allow the suspension to absorb bumps in the road. Originally motorcycles had no rear suspension, as their fr.....
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http://en.wikipedia.org/wiki/Swingarm

Suspension member pivoted at one end and supporting the wheel at the other. In most cases the swingarm is more accurately described as a pivoted fork, as the wheel is supported at both sides.
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http://www.encyclo.co.uk/visitor-contributions.php

The one- or two-sided arm (often made of aluminum or steel) that connects the rear wheel to the fram
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https://www.encyclo.co.uk/local/22370
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