Originally Posted by
waterrockets
Here's a road bike with a TT position. I added a Profile FastForward seatpost to get this position. Note the front wheel is elevated a bit, and I'm not 2cm lower (elbow pad pedestals removed).
http://www.youtube.com/watch?v=r-P4tnf3TKA
That's a excellent adaptation of a road bike to a good TT position. Most attempts i see aren't nearly as effective. You have to bump the seat way forward and drastically lower the stem - which most people fail to realize or accomplish, or both. It's considerably easier with a dedicated TT bike.
Another problem is that long time roadies (like me) are utterly clueless about TT position going in. It took me month of experimentation to get my TT bike dialed in. At this point I realized that all my notions about road bike position don't apply to TT bikes. I'm afraid that most roadies are like me, and that's why most attempts to acheive a good TT position on a traditional road bike is sort of doomed to fail. But as waterrockets demonstrates, it's certainly possible.
Also: these changes render your road bike less rideable in general for anything but a TT. Can you get comfortable on a TT bike? Sort of. Is it as comfortable as your road bike? No.