Originally Posted by
Maelochs
Racers go downhill at ridiculous speeds, wet or dry. And they do it (for the most part) safely. If no one could stop in the rain, every rainy stage would be postponed or canceled. And there is ample evidence that racers race in the rain ... so ...
A closed course is a little different. So is being paid to do it (or have the potential for it). And it's also nice to have a team of mechanics to lube your chain and replaced your components for free if they're a bit gritty.
Sure, it's totally possible to ride in the rain and do so safely. But it's a heck of a lot easier for a professional than for an amateur enthusiast.