Agree with cwood.
As someone who's shot cycling for years I'd also suggest looking for a corner somewhere on the bike course (the tighter the corner the better) where you can get low angle, head-on shots of the riders leaning in to the corner. Just set yourself up, pre-focus on the corner and you're good to go. Like shooting fish in a barrel. Plus being triathletes, if the corner is any way technical you'll also get some shots of the riders crashing. Or, maybe that's just the criterium racer in me being condescending..