Last year I tried to break fourty a couple times and think I got to something like 39.7 (downhill with tailwind). During a ride a month or so ago, I thought I had a chance with a strong tailwind at the top of a steep hill. I had to get a start at the top by bombing through a stop sign. I wasn't able to pedal above about 35, so I went into a tuck. By the bottom I was going 41.7. OK, I broke 40, so that's done, that's fast enough, and I don't think I want to set a faster goal!