This is an intersesting post. When I had my CRF, I ran a 5.2kg spring, and at 95mm sag, I had 20mm of free sag. I weight 215lbs. And at 100mm, I had a tic over 25mm free sag. When I tried a 5.4, I had over 25mm of free sag at 95mm race sag. One thing CRF owners need to know is that the rear spring is actually a progressive rate. Or as Steve at White Bros call it; "active rate". Suppossedly starts at about a 4.8 and goes up to a 5.2 at best. Wonder if the '03 run an "active rate" as well.