If you compete in triathlons, ride time trials or race on the track, you�ll no doubt be aware of the potential gains that an aero helmet can offer. In terms of bang for your buck, an aero helmet is potentially one of the best watt saving upgrades you can make. However, unless your position allows a seamless transition between the helmet and you upper back, you never drop or move your head and you don�t race in sidewinds, traditional long tailed aero helmets can actually slow you down.