You don't have to freeze th emotion. How about wide angle to take in the crowd lining the road, plus the scenery behind and use a shutter drag of about 1/10th - sharp crowd and landscape with a bunch of blurred bikes going by?
Or shoot through a gap in something and frame the bike in : legs of a girl in the crowd, between two heads of viewers, archway, tunnel, bridge.....rocks, trees, gateway?
Just a few that spring to mind.
Same with a shorter lens - say something around the 50-70 mark, slow drag and pan. Don't worry if it all goes blurred, it is meant to. Shutter speed around the 1/2 or 1/4 mark. Legs go all blurred, everything does, but it gives a good idea of motion.
Sharp pics are easy - just whack the shutter up/aperture down and press the shutter. Wow.
What about a bit of fill flash with slow drag - rear slow synch. Blur from ambient, sharp from flash.
How to get impact - choose the colours of the cclist and consider the background they will work against best.
MAKE your pictures, don't take them.In other words, look at the pack at the start and begin to visualise what would be good, and where you could get it - you need to reconnoitre the course first. Then be in the right place at the right time, fo rwhen the light will be right (choose where the sun needs to be to light your pic - then position yourself accordingly. Wait for your picture to materialise, the one you saw in your head before the gun went off.