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You have to think how a spring works, the more of its length that is free, the softer it is. So, as a progressive spring is compressed, more of one end becomes coilbound, leaving less effective length to work as a spring which means it gets stiffer. This means in hard cornering the spring rate is stiffened up to give stability, but straight ahead it is softer for better ride comfort.
Hope that makes sense?
Rich
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http://www.ricola.co.uk
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