aconcagua wrote:
2012 Singapore 70.3 Bike leg:
tribern wrote:
1) Average watts 195 NP, 187 AP 2) Average speed 33.94kph / 21.09 mph 3) Distance 90.7km / 56.35 mi 4) Rider weight 84kg / 185.18 lb 5) Describe bike and wheels Cervelo P3, 2005 808 PowerTap Sl with Aerojacket wheel cover, 2005 404 front, Vittoria Corsa EVO 23 tubs. 2 rear bottles, Speedfil A2 between the arms 6) Misc notes, to whine and make excuses for your lack of power and/or lack of aero. Hot and windy, was ill during the week, but no complaints 7) Optional: a picture (or link to a picture) of you in your aero position. Shouldn't have been any change from above pic @tribern: how tall are you? here's my data from the same race: 1) NP 248W / AP 240W 2) 35,8 kph / 22,25 mph 3) same as above 4) same weight as above @ 200cm / 6'6" 5) Cannondale Road Warrior 800 (2005) roadbike with road handlebars, STI, Syntace C2 clip on & Thomson Elite "set forward" seat post, Cosmic Carbone SL front/back, PowerTap SL, Continental GP4000s 23mm clincher, compact DA crank, 2 standard round bottles inside the frame, standard road helmet 6) same as above (seems like averyone is sick right now here in the region) 7) no picture from Singapore race, but here's one from Busselton 2009 (the same bike just different handlebars, rear wheel & crank): aconcagua wrote:
tribern wrote:
70.4" / 179cm. What's the relevance?
I think I need to lose 5kg to be where I want to be for IMC in August. Just curiosity as I also have my power data from both races (Busso & Singapore) but mine are some 50-60W higher than yours. Esp. Busso, where I rode (last year) pretty much the same time as you my NP is 222W and AP was 216W respectively. So if we take some 10-15W each per helmet & bike, then there is still a difference of ~30-40W at the same weight; thus my question abt your height - and there is a significant difference of 179 vs 200. I am not sure whether that is the sole explanation of +30-40W but it made pretty much sense, especially on such flat courses like those two. In this respect, it would be interesting whether you have any data from some hilly races (like LPT in Phuket, IM Lanzarote or similar) where the aerodynamics becomes less important and the kg/W ratio would be more comparable. Here's my view of the differences. It would be interesting to see what Jackmott or others have to say about the direct comparison: My Bike: 2010 Cervelo P3, Vision Basebar & brakes, Profile Design T2+ extensions. Sram Force bar-end shifters (fullSram Force groupset)
Your Bike: Cannondale Road Warrior 800 (2005) roadbike with road handlebars, STI, Syntace C2 clip on
My Wheels: 2005 808 PowerTap Sl with Aerojacket wheel cover, 2005 404 front, Vittoria Corsa EVO 23 tubs.
Your wheels : Cosmic Carbone SL front/back, PowerTap SL, Continental GP4000s 23mm clincher
My hydration config: 2 rear bottles, Speedfil A2 between the arms (nothing on the downtube)
Your hydration: 2 standard round bottles inside the frame
My Helmet: Rudy Project Wingspan
Your Helmet: standard road helmet
So the difference must be that I shaved my legs :-)
Joking aside: How smooth was your power delivery? Did you focus on an even delivery down-wind and into the wind? Did you have a lot of surges to pass people, did you accelerate hard up the few bumps and out of the u-turns? Did you slow down at the aid stations and speed up after them?
With only 2 bidons on board I'm guessing you took a handup at least 2-3 times in Singapore (to my 1). Apart from the obvious aero and rolling resistance differences in our setups and positions, I focussed on holding 180 -200W all the time, and only took a handup once. I can't see the picture you posted but my position is reasonably aero for my size. (ducks for cover from ST onslaught)
We could have had similar times but if you were pushing out more watts in surges and headwind legs, and I was laying mine down more evenly, it's quite possible that I'd have a lower AP/NP value than you.
For further comparison go here and do the calcs side by side:
http://bikecalculator.com/wattsMetric.html Enter in the same weight for rider but a difference of 2 kg for the frame (yours = heavier) Make sure you show yours as clinchers, and choose drops for yours (since you have them even though you're in the clip ons). Put in a 5km/hour headwind (net) The result is clear: same speed, bigger power output required by one.