difference road bike vs triathlon bike

Tri bikes typically have steeper seat tubes than do road bikes. This engages the quads more during cycling, which saves your hamstrings a bit for the run. Additionally, road bikes have traditional drop bars with integrated shift/brake levers, while tri bikes usually have aerobar-mounted shifters with the brake levers on the ends of pursuit-style bars. This allows you to shift while in the aero position.

Less importantly, tri bikes are designed with aerodynamics in mind (which usually adds a bit of weight. Road bikes forgo aerodynamic concerns in favor of weight saving.

Boy, I bet Tom Demerly wishes he could get paid a nickel for every time that link is posted here    Shouldn't someone make it a sticky, or something, like under an equipment FAQ?

It's a well-written, concise, nearly complete answer to a oft-recurring question, saves a whole lot of typing. Rarely will someone post something in an original answer that isn't contained in Demerly's essay.

Management here doesn't believe in stickies/FAQs.

 Hi again,

 Thank you very much for your clear answer. To summarize we could say it like this:

- more aerodynamic, but a bit heavier than a road bike.

- spares some muscles you will need for running.

 Thanks!

 Greetz,

el_cid