tag:blogger.com,1999:blog-1564958057737541664.post4764556106150085406..comments2014-09-30T06:07:12.399-07:00Comments on On Bicycles, and.... what else is there?: running the numbers from the Zoncolan (2010 Giro d'Italia stage 15)djconnelhttp://www.blogger.com/profile/01484858820878605035noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-1564958057737541664.post-54077855859645439072010-06-03T07:29:01.983-07:002010-06-03T07:29:01.983-07:00It depends on what side you come from. If you sta...It depends on what side you come from. If you start with rider power and then predict speed, the heavier the bike, the lower the speed (obviously; which is why people spend $$$$ for bikes even 1 kg lighter). In the reverse direction, which is the direction of this post, if you start from speed and try and predict power (or power / rider mass), the heavier the bike, the <i>larger</i> the number.<br /><br />So I'm assuming quite a low number for mass other than the bike and rider. It's thus possible I'm overestimating rider mass. I already assumed some deviation from the claimed rider mass of 69.5 kg due to dehydration. Maybe he was even lighter than that: 1 kg, perhaps. But there's so much uncertainty from rolling resistance and wind resistance, for example, that it's tough to draw precise conclusions.djconnelhttp://www.blogger.com/profile/01484858820878605035noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-67039462343886454322010-06-03T04:57:54.900-07:002010-06-03T04:57:54.900-07:00Btw, it wasn't Alex Simmons but the Science in...Btw, it wasn't Alex Simmons but the Science in Sport guys (Jonathan Dugas and Ross Tucker) who did the Contador climbing analyis post.marykahttp://www.blogger.com/profile/16818973141469893210noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-44731835010947582722010-06-03T04:54:51.573-07:002010-06-03T04:54:51.573-07:00If you add the weight of bike and clothes to the r...If you add the weight of bike and clothes to the rider's weight to calculate w/kg, wouldn't that come up with a LOWER number, not a higher one? So that still doesn't explain how you got 6.08w/kg unless you drastically overestimated his watts.<br /><br />e.g.<br />395w / 69.5kg = 5.68w/kg<br /><br />395w / 78kg = 5.06w/kg<br /><br />78kg * 6.08w/kg = 474 wmarykahttp://www.blogger.com/profile/16818973141469893210noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-35641900931567048572010-06-03T04:25:02.005-07:002010-06-03T04:25:02.005-07:00Thanks. Yes -- I assumed everything not included ...Thanks. Yes -- I assumed everything not included in "body mass" was 1/8th the total body mass. So that's 1.7 kg more than 6.8 kg for the bike alone.djconnelhttp://www.blogger.com/profile/01484858820878605035noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-28714617767859423932010-06-02T23:15:16.626-07:002010-06-02T23:15:16.626-07:00Perhaps you included the weight of bike+clothes in...Perhaps you included the weight of bike+clothes in that figure? Sassi didn't: 69.5 kg sounds about right for Basso.EDrhttp://www.blogger.com/profile/13273476507416203860noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-11604715666803584732010-05-24T12:07:26.912-07:002010-05-24T12:07:26.912-07:00Oh....
I get 6.08 W/kg. That's very curious....Oh....<br /><br />I get 6.08 W/kg. That's very curious. I'm not sure what the cause of the discrepancy could be.<br /><br /><a href="http://velonews.competitor.com/2010/05/road/gearing-for-monte-zoncolan_118163/attachment/p5220240" rel="nofollow">Here's Nibali's crank</a>, which appears to in fact be an SRM (in the past racers didn't have 110 mm BCD SRMs, since they so rarely use compact gears).djconnelhttp://www.blogger.com/profile/01484858820878605035noreply@blogger.comtag:blogger.com,1999:blog-1564958057737541664.post-49072301090747135632010-05-24T10:59:55.125-07:002010-05-24T10:59:55.125-07:00Dan -- Did you see the article on cycling news whe...Dan -- Did you see the article on cycling news where Sassi says Basso did 5.68w/kg, 395 watts for the whole ~ 40 minutes on the Zoncolan? Basso had an SRM on his bike, so presumably this was his measured power.Justinhttp://www.blogger.com/profile/15686973565427378277noreply@blogger.com