ric_stern/RST said:In 'normal' air (i.e., not raining) there's already plenty of oxygen -- in fact your body takes in more than it needs -- it just can't utilise all the O2. O2 utilisation being the limiting factor in endurance cycling.
the reasons that you go faster in the rain, are probably related to (a slightly) reduced rolling resistance between the tyres and the road and i'm pretty sure the air density decreases, reducing air drag. also, in my case, i ride harder so i don't get so wet -- it's good motivation!!
Ric
Assuming your going the same distance, going faster makes you more wet. You take up more space. and yes even though you spend more time in the rain going slower, you still get less wet than going faster.