The difference comes in bike positioning setup.

Triathletes may have a “slightly” more relaxed position than a time trialist. In the Tour de France time trials, the time trials are between 20km-40km. They are racing for 20-45 minutes. Aerodynamics is the only criteria. Contrast that to an Ironman, where the bike distance is 180.25 km, where they are on the bike for 4.5 hours. In addition to aerodynamics, they also must be comfortable. Some professional triathletes cannot sustain a pure aggressive aerodynamic position over the 180.25km.

One final note, time trialist are governed under UCI rules, which somewhat restricts the racers positioning (and a few other things). In triathlons, no such rules exist. The main rule is the restriction on seat position. UCI states that the nose of the saddle must be behind the bottom bracket. This rule does not apply to triathletes. So triathletes have the freedom to get really forward on the bike.

Andy Schleck has not raced as well as Contador so far. But when Lance won his 7, he did not race too well either before the Tour de France. I think Andy is following the same formula.

So, if I had to wager a bet, I’d put my money on Contador. But my heart wants Andy to win, particularly because of Contador’s attack on Andy after he had a mechanical problem in last year’s Tour.

But to answer your question directly, the main difference is frame material and aerodynamic wheels.

The pro bikes are using the latest in carbon fiber technology, typically T-800 or another ultra high modulus grade. Your S22 frame is made of aluminum.

The pro bikes will also have a disc wheel in the rear and deep (tall) dish wheel in the front. Most pro riders will have a 108mm dish wheel in the front. Us normal riders will likely have a standard dish 28mm or maybe a 40mm dish front and rear wheels.