I'll note that my personal bike times and run times were better than ever at the usat oly & sprint race, and 70.3 world's after I took off the aeria and rear storage box. I know they are supposed to be more aero, but I felt the bike handled better and at least in my case maybe if I was sitting like a locked in TT pro in a wind tunnel it could be detrimental. But in the real world, I'm handling the bike passing, surging, turning, slowing down, etc so I'm not sure the aero testing factors that in. Even those on the road aero tests don't take the whole bike ride into account, especially a crowded, often bumpy age group course. I'm for sure not putting them back on.