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Aerodynamics

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...
 

TriSpoke Tire Choice

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TriSpoke: Old, Fast Wheel. Slow tires?
How the tire you choose can mean more aerodynamically than the wheel you have, or are considering purchasing

Significance

Stage six of the 2009 Tour of California in Solvang saw Levi Leipheimer snag victory from David Zabriskie by a scant 8 seconds during the violent 30 minute effort. During this time trial stage, Leipheimer chose the time-proven three spoke for his front wheel, while Zabriskie chose the new offering from Zipp: the 1080. Did Zabriskie’s wheel choice lose him the stage victory? Or, was it his front tire choice that may have cost him the top spot on the podium?

Last Updated on Tuesday, 23 February 2010 04:33 Read more...
 

1080 Tire Choice

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Zipp 1080: Deep wheel.  Slow tires?

How the tire you choose can mean more aerodynamically than the wheel you have, or are considering purchasing

Significance

Stage six of the 2009 Tour of California in Solvang saw Levi Leipheimer snag victory from David Zabriskie by a scant 8 seconds during the violent 30 minute effort.  During this time trial stage, Leipheimer chose the time-proven three spoke for his front wheel, while Zabriskie chose the new offering from Zipp: the 1080.  Did Zabriskie’s wheel choice lose him the stage victory?  Or, was it his front tire choice that may have cost him the top spot on the podium?

Last Updated on Tuesday, 23 February 2010 04:32 Read more...
 

Rough CFD Simulation

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Rough CFD Simulation

by: BTR Forum Member: zebragonzo

This model is intended to show the flow of air around a rider and to give armchair aerodynamicists a chance to better understand how air flows.

Because of the complexity of the model and the limited time available to run it, the mesh has had to be simplified such that the accuracy isn't spot on. Additionally, the legs and wheels are not rotating. Finally, there are some areas that did not mesh quite correctly (front of the chainring, some of the rear wheel, top of the down tube). Despite these errors the simulation reports a drag of 2480g for both the rider and bike which is as would be expected for a cyclist in this position thus indicating that the error isn't sufficiently high that the model does not resemble real life.

Last Updated on Sunday, 14 March 2010 21:10 Read more...
 

Big Fat Helmet

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Big Fat Helmet™

Can someone please tell Robbie McEwen to retire the Big Fat Helmet™ that he and his teammates wore during the opening Tour de France prologue?  It is physically painful for me to look at that thing.  Not only is his helmet just plain dorky looking, there isn’t a doubt in my mind that it is an extremely slow helmet and ultimately is a detriment to his time-trial performance.  What would make me say such a thing? 

Last Updated on Sunday, 24 January 2010 04:53 Read more...
 



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