Originally Posted by hhnngg1

This has been extensively studied and the results are well known in triathlon circles, particular at Slowtwitch.com.

THe answer:

- YOu save a greater % of racetime the faster you go. So, a 30mph TT rider will save a greater % of time in a TT than a 15mph rider.

- However, because the slower rider is on the course for a longer period of time, the total amount of time same (actual minutes, not % of total race minutes) is usually very close to equal of that of the rider at 40k. At 112 miles (ironman distance), the total time saved by the slower rider is usually more than that of a speedy rider, despite still having a smaller % of overall race time saved, in the order of minutes.