Quote:
Originally Posted by dradernh
In the case of coilover springs, I've used the manufacturer's data that's stamped on the springs. The Eibach coilover spring below, for example, shows that the spring has a free length of 8.00", an internal diameter of 2.25", and a rate of 500#/inch.
If I had a spring with an unknown rate and needed that information, I'd have it put on a spring tester.
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I'm kind of surprised Eibach would be stating their specs in imperial measurements. Eibach also has TUV documentation on their site with drawings, dimensions, cycling data, and spring rates (in N/mm).
Here's one of their documents I used when looking at springs.