Shots are not too bad considering the angle, camera and lens. A frontal angle would have been better because you could have captured not only the riders facial expressions but had the rider coming at you more instead of going away. You could have captured some nice silhouettes too shooting into the sun for an artsy look. An f/2.8 lens like the 70-200 2.8L would have blurred out the background more and made the riders pop with a faster shutter speed.