You hear the squel but its not as violent as some of the ones I hear in most the Brit vids, You know what I am talking about!
And yes, they probably do have a untapped res of built wheels for them. Their pros, I cant imagine they go through THAT many, Hermance and Beleay arent exactly heavy are they now :-
EDIT/ Id imagine that if any of us rode for 6hours+ a day, most days if not everyday we would go through a hella lot more rims than we do!