One thing the Race Tech guy (Matthew Wiley) told me was measure the preload from the beginning of the threads in the fork tube, NOT the top of the fork tube. You will add too much preload if measured from the top (about one inch too much). My front was too stiff and I ran into him at the Cycle World Motorcycle Show and asked him some questions about it. The top of the spacer would be about even with the top of the fork tube using his recommendation for normal preload. Now you can use any preload depending on how you want the fork to respond but this was his recommendation. The forks have to be suspended / topped out (no load) when measuring.