Moving the forks straight back does not alter the rake angle (the angle ahead of vertical at which the forks are mounted). That remains parallel to the head angle. .6 is 24.25% of 2.5, but that has nothing to do with anything we're talking about. Because the forks move straight back toward the stem, they do so along a line which is 117.5 degrees from vertical (perpendicular to the steering head), or 27.5 degrees to the ground, which is the line through the axle center I mentioned earlier. Moving the forks back 2.5mm moves the axle down this line by that same distance, and the axle's new location on that line is .6mm closer to the ground than it previously was. If you PM your e-mail address to me, I'll send you a diagram of what I'm talking about. If I can get my web site to talk to my computer again, I'll post it there and post a link. ya i know it doesn't change the rake i just worded that wrong by using "just" i'll go back and fix it. but if your forks had a 67.5' rake, the amount of movement below horizon would be 87.5% of initial movement ....45' rake is 75% below....22.5' is 62.5% below between 22.5' and back to the opposite 90 (0') its rapidly accellerated. i just got done making the models just post it here if you can.