| I do have a formula that I have used for 15 years where by you can work out a single rate spring from its measurements,
you need to input the spings OD, the OD of the wire the spring is formed from and the number of free turns.
I also have another 15 year old formula I use for selecting springs rates, mainly used when I was building specials.
This uses information
Such as the bikes weight bias and overall weight of bike and rider, amount of suspension travel available (shock or fork stroke), linkage ratio (plotting the curves is fun) and g force the wheel is likely to encounter (size of bump and speed at which it hits it)
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