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Old 19-11-2019
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A spring should never become a solid cylinder of steel (ie: fully coil bound), because it causes lots of stress in the spring and in the other suspension components.

A progressive spring will have a section that becomes coil bound somewhere during its travel. If it doesn't, then it isn't actually a progressive spring - the only real world exception is a pig-tail spring (which I've never seen on a dirt bike).
Occasionally you'll see so-called progressive springs that are made from variable diameter wire but don't go coil-bound in any section - these are not progressive in any useful way.
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