Join Date: Oct 2008
Location: Chicago, IL
Bikes: S-Works Roubaix SL2^H4, Secteur Sport, TriCross, Kaffenback, Lurcher 29er
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The canti will definitely be much more flexible as far as wheel choices go, but if this is going to be your first tri, you probably won't even notice the wheels. I've ridden in the Pleasant Prairie Tri the past two years, first year on a Specialized Tricross and last year on a carbon road bike. I was 8 minutes faster the second year, but I think the vast majority of that was improvements to the engine, not weight loss.
So what I'm saying is pick the bike for the other 364 days of the year. If you think the discs will serve you better, go for the disc Poprad. If you don't have a strong preference for the discs, I'd go with what's more flexible.