The spring numbers mean nothing except the larger the number, the harder the spring. It isn't on a scale or anything, I can't see any reason for the numbering either as the touring car springs are all numbered in the 30's.
I don't think anyone has tried to test the springs, I haven't seen any real measurements anywhere.
To be honest if you plan to use Losi springs anyway you may as well just throw on the same ones that you would use on an XX-4 and work from there!
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