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the preload adjusters primary function is to match the race sag to the desired amount, based on rider weight. I'm of the belief that it also stiffens up the front end (increases the fork springs' effective spring rate) a bit, too, but others on this board have different views.
there are host of variables that go into tuning the forks... spring rate, preload, oil level/weight, compression damping (which the emulators adjust), rebound dampening, etc.
It all depends on what problem you're trying to fix.
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