Swift uses the term of (usable stroke), where other brands state (stroke). What is the difference between them?
Stroke is the free space from the top of the spring to the bottom of the spring. The length of the spring can be compress before coil bind. Swift’s (Usable Stroke) = length of spring where desired rate starts to the length of the spring where starting point of spring rate rises. If Swift was to use the same measuring method as other brands manufactures, our “Stroke” statistics would be a lot longer then other companies due to our less coil design. However, we think that would be unfair. We understand that when spring rates starts to increase after a certain measurement of compression, we should not call it stroke. Since the rating is not at the ideal rate, the spring is no longer in the range of the “Usable stroke”. If other brand manufacture were to use the same method of testing on usable stroke. They will find that most of the springs in the market today have an extremely limited usable stroke. Most springs that we had tested had shown signs of increase in rates with a minimal compr
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