My first post, bought a 2010 st 2 weeks ago, loving it but found the rear suspension hard but then I'm used to cruisers... so am interested in this thread ...addressing bazzers post, it would be completely wrong to preload so the bike did not sag at all? Eg make the preload exceed the rider/bike weight?
In which case the pre load should simply set he position in the available travel and 1/3 down with rider on board seems to be accepted amount when "static" which makes sense to me given g forces in bends etc which at the extremes would almost double the riders weight, and you need a bit of travel left even when cornering at the extremes
I'm 100kg plus so need the pre load upped a bit compared to most i guess
My bike has std st front end but str rear shock so i can adjust the damping once the pre load is right. It does seem to be about right with 10 threads showing it sags about 30mm when i sit on it