Yes, but to go back to the first post, what power output do I need to hit 25mph?!!! I know it depends on a variety of factors, so I typed them into the analytical cycling web site. Apparently its 593W for the local 25 course I use a lot, for my weight of 78kg. Now Chris Boardman broke the hour with, I think, around 430W. So where do AC get their figures. Am I missing something?