Join Date: Oct 2007
Location: Gainesville, FL
Bikes: Trek 1500 road bike, Giant Trinity Alliance tri bike
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Definitely invest in the clipons and a seatpost that will give you an effective Seat Tube Angle of at least 76 degrees (preferably 78 or higher). If you can get the seat forward enough and the aerobars mounted low enough, you're 90% of the way to a full-on tri bike!
P.S. I have a Profile Fast Forward seat post I could sell you for cheap if you were interested
It will turn your 73 degree STA Madone into a 78 degree "tri bike" instantly!
P.P.S. You may also want to consider a triathlon-specific saddle, such as the Fizik airone Tri or the Profily Tri Stryke. It will allow you to sit on the nose and be comfortable, while getting even further forward relative to the bottom bracket. Also, that way you can have a seat/seatpost combo for your road setup, and a seperate seat/seatpost combo for your tri setup!