I've been road bike riding for years but just ran across this thread looking for info on Ksyrium Sl's. (why do the spokes click). Anyway I just purchased an 08 Madone 5.5, and I went down on a century ride on Sunday. I was in a group and locked onto a real wheel at 23mph and went down hard. If I wasn't wearing a helmet I would be dead or in a coma, my head hit the curb. Hope to give and get info on this forum and meet new friends.