These are the things to go for when you upgrade your springs. In actual fact, it’s difficult, not to get progressive springs when you upgrade - most of the aftermarke, t manufacturers make them like this, . Most factory-fit car springs are normally wound. That is to say that their coil pitch stays the same all the way up the spring. If you get progressively wound springs, the coil pitch gets tighter the closer to the top of the spring you get. This has the effect of giving the spring increasing resistance, the more it is compressed.
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