Podcast: Aerodynamics With Dave Ripley

May 15, 2014


Click Here to listen


In addition to working for Zipp, David is also a bike fitter and consultant for 51 SPEEDSHOP.


Topics discussed include:

  • The Four restrictive properties working against you on the bike are:


1. Aerodynamics
2. Gravity
3. Drivetrain Friction
4. Road Friction


  • 75-80% of aerodynamic drag comes from the body.  The wheels are the second greatest source of drag.  Components are next, and the frame is last.  

  • Weight doesn’t become a significant factor until the grade hits 6% for an extended period of time. 

  • A good clincher and latex tube compared to a poor tire and a butyl tube can result in a 10-11 watt difference per tire.  

  • He recommends air pressure of 100psi for a 150 pound rider on a tri bike on a smooth road.  On a rough road a slightly lower tire pressure is recommended. 

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