I think when it comes to cycling speeds theres 2 very important factors to take into account:
1: The course and 2: The Wind!! (I really hate 2)
I was out on a 100k training cycle on Saturday and was hitting an average of 20 / 24 mph on the way out (I was delighted!), when I reached my turn around point it became painfully obvious that I'd have to cycle into the wind most of the way back...
I wont be posting my average speed for the return journey!
