Triathlon bikes are very different to your standard MTB.  Although similar to road race frames, they are designed to optimize aerodynamics.  The bikes are designed with aggressive geometry which means almost vertical tube angels, a low stem and handlebars which are relative to the saddle, which again increases the aerodynamics.  The bikes will be made with an oval or teardrop cross section, handlebars may be flat and wheels will have less spokes than normal.  Add this to the carbon fiber parts and this makes for an extremely lightweight frame.

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Triathlon Bike Frame is a post from: Mountain Bike Frame

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