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[QUOTE="LogicTech, post: 734560, member: 51157"]
DEANFASTWAY
I used the KTM 2004 manual and extended the charts out for the heavier weights. The SX bikes are also listed. They use springs two levels higher than the EXC’s. Knowing that I still use the EXC recommendations, but try to stay near the top of the 10Kg usage window or the next higher rate. Using a heavy PDS spring I tripped over this one. The PDS-4 was used one older 300MXC which was 25lbs heavier than the new 200. I guess I put the bike on diet rather than myself. After having great success with the PDS-4  I wanted a way to reference a PDS spring back to the calculations with the straight rate springs. This is where the 1.15 factor comes in. I matched the PDS-4 high spring rate. PDS springs are much softer than the specifications indicate. The PDS-4 measures 115mm race sag with the 235lb load. Calculating spring loads with straight rate springs seems to be good method to determine the high rate. Calculations with the Progressive spring are too complicated.
LogicTech
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