We've just launched two new spring rate calculators.  Both calculators are frequency based and operate in a different way to other spring calculators.

Simple Spring Rate Calculator

This is a free simple spring rate calculator to ball-park bike setup and makes several assumptions to reduce the user input down to just one variable (rider weight).
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Advanced Spring Rate Calculator

This complex spring rate calculator allows the user to enter rider weight, bike weight and unsprung weight as well as bike geometry numbers to get the most accurate starting point for bike setup.
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