There was the "Adorior mountain time trial" that went from Glossop, over through Hayfield to Chapel, and then up to Mam Nick, over and down into Edale, then back from Bamford over the Snake. I never rode it as I am the wrong shape for hills (and they the wrong shape for me). However, I recall a friend reckoning, comparing an unofficial time at the top of the Snake with the timekeeper's time at the bottom, that he had been close to 60mph on the way down.