Manuals do tell what recommended sag is, but it's quite wide limit. For my Manitou R7 it's something between 12 and 16mm. Next to that, when I set my air pressure so, that sag was somewhere in these limits, I was getting out something like 50-55mm of travel (air pressure was around 130psi). After that I started to experiment a bit, and lowered pressure to 110-115psi and all of a sudden I'm getting around 75mm of travel. But I just don't care anymore if sag is really between 12 and 16mm, or if it's a bit more. Fork works much better when set this way, as it did before, when it was set "by the rule"
PS: Pressure calculated out of riders weight (I forgot formula) is even more off. For me it should be somewhere around 140-145psi, and it felt like I would be riding rigid fork
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