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Integrated aerodynamics. Total control. Unrivaled efficiency.  With the Propel Disc range, we set out to redefine speed. To achieve what was once unachievable. The frame is engineered with all-new airfoil shapes that are proven faster at various wind angles. It has the highest stiffness-to-weight ratio of any bike in its class. And it’s integrated with disc brake technology. This is how we define speed. Ultimate speed.