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Welcome to BTR!

Triathlon Pacing

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The insights surrounding average power contained in this plot I created about a decade ago are still important when it comes to pacing the last two events of an iron distance triathlon:

triathlon pacing

 

 

The Importance of Tire Selection

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All samples described below were tested at the Oran W. Nicks low speed wind tunnel at Texas A&M University using dedicated cycling fixtures in January of 2003.  Data is presented as axial force (which is equivalent to drag at 0 degree beta/yaw) at 30 mph.  Relative ordering will be the same at lower speeds, but the magnitudes will be decreased.

Last Updated on Saturday, 26 October 2013 01:46 Read more...
 

build your own wind angle probe

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Here is a parts list spreadsheet for the wind angle sensor I cobbled together a year and a half ago.

If you are interested in collaborating with me to improve the prototype design/manufacture, send me a note:

This e-mail address is being protected from spambots. You need JavaScript enabled to view it

 

 

average tour stage power and speed

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I spent <5 minutes on google this evening and found these two nuggets that might help the scientists @mitaerobike, @chrisyuinc, and also @jim_gourley / @rappstar over on twitter do some helmet claim math...

5 hr flat stage power and speed:

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

http://home.trainingpeaks.com/races/tour-de-france/2012/stage-2.aspx#.Uk7qQ4ZQFP4

 

5 hr climbing stage power and speed:

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

http://www.trainingpeaks.com/av/NJE2HNXKO3TB6F57CNGLIRVPF4

 

...and new information in the mix is that the Specialized crew is now claiming only 20W over their road helmet at 30 mph while being tested on a mannequin in isolation in a wind tunnel (as I understand things):

https://twitter.com/chrisyuinc/status/384426415262679040

 

based on the new bits of information above, what are your estimates for watt savings during a 5hr tour stage?

***Incentive alert***

free, single BTR report for the most clever interaction on the twitter exchange here:

https://twitter.com/biketechreview/status/384329778259836928

or the facebook post here:

https://www.facebook.com/permalink.php?story_fbid=616284455088772&id=142350229148866

 

good luck!

 

 

 

Last Updated on Saturday, 05 October 2013 17:33
 

Specialized Evade Aero Helmet Claims

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Awhile ago Specialized released this video during the launch of the s-works evade road helmet:

http://youtu.be/Do1kQW9Bj9o?t=1m34s

At about the 1:35 mark a claim is made that the helmet would save 400kj during a 5-hour stage of the tour de france. Sounds like a lot, doesn't it?!?  Let's take a closer look at this claim for fun.

Last Updated on Sunday, 29 September 2013 23:19 Read more...
 
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