Looking at this from the perspective of a former domestic pro cyclist who runs not exceptionally well now:
The type of effort in a time trial is the most comparable to running, and the absolute key to a 1hr time trial is lactate threshold, whereas in running it seems to be more balanced between lactate and aerobic threshold. (assuming good technique in both sports). Essentially in cycling the musculature used is reliant 100% on muscular contraction, relatively slow movement, and limited muscle groups doing the work. In running you see a large dependence on "springyness" of muscles and tendons, using what is largely plyometric style bounces spread between a few extra muscle groups (hamstrings, hip flexors, calves) firing at a much quicker velocity through a shorter range of motion.
Put together, this means that when a non-specialized athlete performs a 1hr TT, their lactate clearance will be the limiter on a bike, and their aerobic capacity will be their limiter on a run. We know this to be anecdotally true, as we'll often see beginner cyclists comment about how their legs are burning, and beginner runners being so out of breath they can't comment.[/quote]
You don't know cycling. Muscle "springyness" is just as important as in running. It's called Souplesse. Look it up.[/quote]
You got it backwards, homie. I'm saying "springyness" is FAR more important in running than in cycling.