The trek emonda alr 4 road bike 2017 is part of the lightest line of production road bikes ever offered available with an elegantly designed 300 series alpha aluminium frame that produces a fantastically balanced and sharp ride size specific tubing allows each size to have been engineered optimally for both weight and stiffness complete with the sleek looks of invisible weld technology for stronger joints while using less material for the geometry the trek emonda alr 4 comes with a h2