Road cyclists are often obsessed with being lightweight. A road race cycling course will often have more vertical feet of climbing than a tri course. In addition, the ability to draft off other riders in road races allows these weight considerations to become more central as aero advantages are gained from drafting. While aerodynamics still matter more than weight for roadies, for triathletes who cannot draft and race on courses that rarely ascend Alpe d'Huez types of climbs, aero is KING.