Originally Posted by
Pratt
McBTC-
If you increase your speed on the flat from 12 to 13 MPH, you will have to put out 17% more effort. Wind resistance goes up as the square of the speed, and 169 is 17% bigger than 144. The magic of a super light road bike pales beside the magic of 25 year old legs.
... actually, increases at a
cubic rate (so, ~27% more) but you're right– I got old legs!