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Stage 3: Aero Advantage

from Allen Lim, PhD

When Will finished today, he was tired, but he wasn’t blown. At 5020 Kilojoules, an average power of 274 Watts (303 when pedaling), and less than 30 minutes of zero time, the day was about as good as it gets for a 5 hr day. But, when I went over Will’s numbers with Danny Pate, I was surprised by Danny’s reaction -- a quick, “is that all?”


“What do you mean, is that all,” I replied. To which Danny proceeded to point out the obvious – that Will was basically out there the entire day, in really heavy winds, at speeds that kept 175 or so of the best cyclists in the world from catching them. When it comes to numbers and real world experience, there’s no one I trust more than “The Pate” at giving me perspective. He’s been using power and racing for so long now that he’s literally a human calibration rig. So I asked, what he thought Will’s numbers should’ve been for that performance, to which Danny responded, “at least 1500 or 2000 more Kjoules than I did.”


Danny who had been sitting in the pack all day finished the race with a total workload of 3906 Kjoules and an average power of only 211 Watts (265 when pedaling), or 22% less than Will. Not one to discount Danny’s intuition, I immediately began thinking about all of the aero road equipment we’ve unveiled at this year’s Tour. From the new AR Felt, the Oval aero handlebars, and the new Pearl Izumi aero jersey, Will was on some pretty fast equipment today. So to cut to the chase, I went to Will and asked him how fast he thought all that stuff actually was. His immediate response was that he felt he had a 15 to 20 Watt advantage all day. Interestingly, adding 15 to 20 Watts back to Will’s average would’ve made the difference between Danny and Will about 1400 to 1500 Kjoules instead of the 1100 Kjoules that we actually measured.


As unscientific as this comparison is, I’m not that surprised how closely both Danny and Will, independently, agreed on the discrepancy between the actual versus their expected values for the day. While all the credit goes to Will today for a truly incredible and inspiring ride, if I were to trust my rider’s intuition as much as I trust the numbers, then both tell me we had a major aero advantage today. In the end, it’s that combination of heart and innovation that makes this program and our sponsors so great to work with and that will hopefully bring us more days like today.



Have a questions for Allen about the Tour de France, racing with power, or the guys in argyle? Post it below in the comments section, and he'll do his best to answer it for you.

7/8/2008 2:52:41 AM (Central Standard Time, UTC-06:00)
Hi Guys
Awesome stuff yesterday
My question is this;
Are you using the powertap and the new Garmin705 together & if so how have you managed to get them to talk to each other?
I used the new wireless powertap MTB hub on the ABSA Cape Epic this year and I can tell you it saved us big time by allowing us to pace ourselves perfectly.
We will be using it in the transrockies in August and were hoping to have the Garmin705 & PT talking by then so we can have more space on our "dashboard"
Keep up the gr8 work on the TDF guys YOU ROCK!!!!
7/8/2008 5:11:01 AM (Central Standard Time, UTC-06:00)
Yes. The team is using the Garmin 705 with new 2009 generation PowerTap Ant+Sport generation product that will be available this fall. Check back at cycleops.com or with your dealer for details.


7/8/2008 2:28:56 PM (Central Standard Time, UTC-06:00)
Hey Guys,

Keep up the great work. Garmin-Chipotle-H3O team continues to be in the spot light at the Tour. Ryder, keep the Canada flag flying high.

Alan,

How did you calculate the Avg Watts (while pedaling) and time of zero pedaling? Can this be done on the Powertap software? I would like to calculate my Avg watts while pedaling and zero pedaling time.

P.S. I love the potatoes (rocket fuel) on my bike rides.
NOTE: Try substituting Red-Pepper jelly for Strawberry jam on the Panni.
Goes great with the ham and cream cheese

Thanks,

Rod
7/8/2008 2:34:17 PM (Central Standard Time, UTC-06:00)
The Avg Watts while pedaling is a feature we're working on for future versions of PowerAgent. Currently, this number is a calculation that Allen does in a separate spreadsheet where he keeps track of all the riders stats for each stage to monitor how they're doing over the course of the Tour.
7/10/2008 2:00:07 PM (Central Standard Time, UTC-06:00)
In the time trial, it looked like some riders were close to spinning out on the very fast tailwind return section. What kind of gearing were guys running? Should they have taken something a little steeper so as not to run the risk of spinning out? What were the kinds of power seen into and with the wind?

-dB


7/16/2008 3:44:58 PM (Central Standard Time, UTC-06:00)
DB,

The guys were running 56 x 11 as their hardest gear. Generally, speaking if a rider is at a point where they are spinning out that particular gear -- for example -- on a slightly downhill tailwind section -- they can go even faster if they tuck and coast. So we don't often worry about trying to max out the gear past the 56 x 11 unless their are lengthy and extended sections of downhill tailwind. The optimal pacing strategy over undulating terrain occurs when the guys adopt an uneven power profile, going harder over the hills and floating a bit on the descents or fast sections. This pacing strategy also works for head winds (higher power) and tailwinds (lower power). For our riders, they averaged 400 to 500 into the wind but only 350 to 420 with the wind.

Allen
Dr. Allen Lim
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