Thanks Maelochs! I was referring to Olympic-length triathlons, not the actual Olympics. I only do the short sprint tris right now, which typically have about a 9-mile ride. I'm not too concerned about an aero helmet for that. Nor will I ever be super competitive, so as to want to shave a few seconds wherever I can. To refine my question: does an "aero" helmet, or TT helmet, even matter for my needs?