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There's an entire industry of shit to strap to tri bikes.
Which I'm carefully avoiding at the moment. I'll be using this for IM Wales (without the Carradice though):-
http://www.greenbank.org/misc/IMG_1267_small.jpg
I will need something higher than the Profile Carbon Stryke I've got, I can't maintain that position (with my current gut at least) for 10km let alone the majority of 180km. Then again, it's lumpy enough I'm more worried about W/kg rather than W/CdA.
There's an entire industry of shit to strap to tri bikes. I know, because I've bought most of it.