Fork Spring Weight.

[Jim Stewart]

Here's the setup for a rear spring:
http://www.strappe.com/pics/spring_rate.jpg

Fork springs are similar except you'll need a rod through the middle of the 
spring to keep it straight. Or leave it inside the fork tube for the measurement.

Here's the formula for spring rate, specifically tailored to SV fork springs by 
Mike Craig:
http://www.strappe.com/spring_rate.html

-js

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