TT bikes hit the pavement in California

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Kelly Benefit Strategies/Medifast rides LeMond bikes(Image credit: James Huang)

The third running of the Tour of California got off to a picture perfect start in downtown Palo Alto amidst healthy crowds and sunny, warm skies. Although just 3.4 kilometers (2.1 miles) in length, the prologue's relatively flat course meant that teams and riders would be paying especially strong attention to aerodynamics. Wind tunnel testing has long been an integral part of the early season preparations but as teams and riders have become more proficient in the fundamentals of cheating the wind little details are beginning to make more of a difference.

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As it turns out, poor cable housing placement apparently has far more of a detrimental effect than once thought and teams are being much more mindful of cable routing than in years past. Housing has a relatively small frontal area but its round cross-section creates turbulent airflow right at the front end of the bike that can affect the performance of more aerodynamically shaped surfaces behind it.

The Slipstream/Chipotle riders left the start house aboard Felt's latest DA frames which were designed from the beginning with significant input from computational fluid dynamics software and wind tunnel test sessions. As a result of some of the knowledge gained there, Felt engineers routed the derailleur and rear brake housings directly into the frame right behind the stem where the air was already 'dirty' from the rider's hands and arms, thus leaving clean air around critical frame regions. According to Slipstream Team Physiologist Allen Lim, sheltered housing consistently save about 1-2 watts in the wind tunnel without the rider aboard. Lim said that adding the rider does wash that result out a bit, but "it still matters."

Power meters have always been a critical part of Slipstream's training and racing equipment but in the past, riders have either had to ride deep-section rims built around PowerTap hubs during time trial events or simply go without if they opted for discs. Team riders were spotted here at Tour of California with a pair of new Zipp discs, though, both of which were co-developed with PowerTap to directly incorporate the power measuring technology inside a new hub.

Rock Racing has been awash with controversy lately and not even its relationships with bicycle and equipment sponsors past and present has been spared. DeRosa emerged as the team's bicycle supplier earlier this season and we expected to see the team's abbreviated roster aboard the Italian company's TT model, the carbon fiber Kron. Instead, we spotted no fewer than three different makes of bikes in the pits prior to the start of the prologue. Half-hearted camouflage efforts did little to hide the distinctive shapes of Scott's Plasma TT and Look's 496 frames and there were no Kron framesets to be seen at all (although they may have pulled them out when we weren't watching). At least one rider took off on an aluminum DeRosa Protos road model fitted with clip-on aero bars.

Michael Ball has managed to strike a wheel sponsorship deal with Cole Products, though, as most team bikes we spotted were equipped as such (along with big green "ROCK RACING" decals, naturally). Still, the team pit area was littered with a wide range of other models (both wheel and otherwise, although we'd never use "wide" in reference to the latter) from manufacturers such as Mavic, Zipp, Lightweight, and Lew Racing.