The cyclist in a triathlon is unique, and i would like to include the defining features of a triathlete on his bike. Those features are: Aero helmet, riding in a low areo position, water bottles behind the seat, aero wheels... see the pictures of triathlete at two links below:
http://www.spencesmith.com/wp-content/uploads/2008/10/triathlete-cycling-large1.pnghttp://www.slowtwitch.com/Products/Tri_Bike_by_brand/Kona_top_15_men_on_bikes_3223.html