Footballus vita est
Join Date: Jun 2002
Location: Portland, OR
Bikes: Trek 4500, Kona Dawg
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To some degree it's personal preference, but sag does serve a purpose; it gives your bike "negative" travel so the tires maintain contact with the ground better as the wheel rolls off small bumps, roots, etc. This gives you better control.
I think the general recommendation is to have about 25-35% of your total travel in sag. That's measured with just your weight on the bike, in your normal riding position. The easiest way to measure it is to put a zip tie on the leg, sit down, get off to check the zip tie position, then adjust.
And feel free to play around a little bit with it so you can get a feel for what works best for you.
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