Originally Posted by Machin

I know this is an old thread, but I thought the topic seemed appropriate...

I'm a mechanical engineer by trade and "a bit" geeky. Like a lot of other people I wanted to know how much faster "x" would make me on my bike so I wrote a little program and began gathering as much real-life data as I could... both from my own testing and other people's testing.

Once I'd written the program it seemed a waste to keep it to myself so I registered a little web domain and put it on the web... I hope nobody is upset if I post a link here.... it's totally free to use; just fill in your data hit "calculate" and it'll tell you how much faster "x" would make you on your bike over the same ride:

CYCLE SPEED MARGINAL GAINS CALCULATOR

Because the gains are presented relative to one of your actual rides then the results should be a very good indicator of what you'd expect to see -as long as you put in the same effort and the wind conditions are the same!

Any feedback appreciated!