
Originally Posted by
warewolf
Spring rate and preload are the primary suspension elements. They set the bike's and the swingarm's geometry which are critical to good handling and good suspension action. Always set them first before you do anything else. More compression damping will help the suspension ride higher in the stroke, and too much rebound damping will hold it down too low.
Suspension tuners should be able to guide you on the correct choice of spring. Otherwise try something like advrider/ktmtalk for someone with your characteristics who's had their suspension professionally turned, who'll tell you what spring rate they used. There are after-market spring manufacturers who may be cheaper.
You won't get a spring correct for both solo and fully laden, so you'll have to choose where your compromise is. On road bikes I liked a slightly firm-for-sporty solo spring which is then a little soft, comfortable but wallowy when fully laden. Since you are generally riding less aggressively in the latter case, comfort is more important than road-holding and lets you get away with a sub-optimal spring. The 640 already has a too-stiff spring for me, so a bit more preload generally is enough to cope with a light touring load. But it doesn't work properly solo in technical riding where you need a lot of suspension compliance, so I want a lighter spring for my weight. Then if I go on a long trip laden, I'll probably spend the 30 mins it takes to swap springs. Best of both worlds.
Bookmarks