what is a spring? what is spring rate? What is a progressive spring? when you put a force on a spring it compresses x if you put a spacer in, the spring still compresses x if you put preload on, it's like putting a spacer in, and teh spring still compresses x if ou don't believe me: http://www.roadracers.co.uk/suspension.htm http://www.mad-ducati.com/Technical/916Suspension.html thinks too look at: http://www.peterverdonedesigns.com/motorcycle.htm#springsag Delicious! http://del.icio.us/pll