Originally Posted by jrennie
"Fat tire" is a mtn. bike. I am fully in support of upgrading the engine not just the bike but a triathlon(and bike aerodynamics) is all about conservation of energy and portioning it out over the course. The rolling resistance created by the "fat tires", upright riding position and strap pedals are robbing you of energy that could be used on the run or faster bike times.
Makes sense - I did a quick google and found some off road tri's that use fat tire bikes.
What are the "BD models" that you mentioned? (you can PM me if you would like.)