My question - How quickly (he he) would I do a 10 or 25 TT if my ave speed was say 23.5mph? is there a formula you can use to easily work out how an improvement in speed of x will result in a reduction in time of y over 10, 25, 50 and 100 miles? Apologies I may be being exceptionally dim here but a) it wouldn't be the first time and b) my head hurts

A beer or three for the best (read easiest to understand yet at the same time correct) answer at some future Addicombe social. Cheers - Snoop