Thanks for your replies.
The spring on the original XT600E shock, and it's Wilber aftermarket replacement both appear to be linearly wound to my eye (i.e. not progressive), but I seem to remember reading somewhere that the linkages produce a progressive effect.
The instructions supplied with the Wilber shock do say to set the preload so that one third of suspension travel is used up by weight of bike plus rider, hence my original question. They do not mention a distance in mm for setting the sag. I have found many sites on the web for setting up sport bike suspension that state that with just the weight of the bike on the suspension it should sag #1 to #2 mm, with the rider it should sag #3 to #4 mm and if you cannot set up the preload to get inside both of these ranges then the spring strength is wrong for you.
Unfortunately I have been unable to find advice for bikes with our longer travel suspension, and I was hoping that someone here might be able to give this info.
I will try emailing Wilber, even though I bought the shock 8 years ago from an Australian agent.
Thanks
Mark
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