Head-to-Head: Specialized Shiv, Giant Trinity Advanced SL, and Trek Speed Concept 9 Series

  • By Aaron Hersh
  • Published Aug 18, 2010
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Every aero bike on the market uses some version of an airfoil (teardrop) tube shape, except for the Trek Speed Concept. Trek uses an airfoil with the tail chopped off called a Kammtail. Trek says this design gives their tubes the aerodynamic characteristics of a much deeper airfoil. Although Trek asserts that this tube shape is significantly more aero than a typical airfoil tube, the Kammtail’s aerodynamic superiority has only been validated by experts who receive a paycheck from Trek. Their engineers do, however, tell a convincing story about the efficacy of the Kammtail.

Liz Hichens is the Web Editor of She is an Ironman and marathon finisher and fan of all endurance sports.

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