Rear preload adjuster for passenger

I would like to know what 1 click on rear adjuster value for pound.

Ex, 125 lb passenger = to how many more clicks ?

I don't think there is a measurable level per click, at least that I am aware of, essentially what you want to do is measure the sag with the rider or riders on the bike (with typical riding gear on) and set it based on desired sag value. Typical sag for street riding is 30mm-35mm, so target that range and turn the knob to get the sag set. Once you have the sag set, take some nail polish or paint and mark the setting on the knob and knob housing to show where this setting is. If you're doing two settings, one for single rider and one for two riders, maybe use a different color on the housing to show the difference between the two settings.

ok, thanks

It has a tendency to stick.  Twist the knob at least every time you do an oil change.