[teachingaway]

noooo! this isn't a software problem. Just hook the fan up to the bicycle wheels!

Pedal faster, fan goes faster.

Product already exists (though somewhat expensive at $200) http://www.amazon.com/Kreitler-Killer-Add-On-Headwind-Fan/dp...

[83457]

good point for training purposes but for a cycling simulation you would want head wind, tailwind and wind while going down hills. You should be able to coast down a hill and know you are going fast. Also could be used to simulate drafting