I'm glad you guys found my post informative--I'm not a Headshok expert by any means but I am reasonably sure that all the info I gave is correct. As always, Cannondale is the final say, however. My girlfriend was sitting and waiting to head out for coffee and a few rounds of Sequence whilst I typed it, and declared that she admired my efforts to write the great-American-novel, but felt they would go unappreciated on Bikeforums! I showed her!