A: For sprint- and Olympic-distance triathlons, the answer is no. The bike leg is too short to justify spending hundreds of dollars to shave a few seconds off your time. For an IRONMAN or 70.3-distance race, an aero helmet can save you a few minutes over the course of the bike leg. If you're truly competitive or looking to break a PR, an aero helmet might be the difference maker. If not, and you're simply trying to finish, save your money.