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.
Using our AeroSystem Shaping Technology process, we took a holistic view of the bike as a complete system, analyzing countless combinations of frameset designs through CFD and wind-tunnel analysis. One of the key breakthroughs is a new truncated ellipse airfoil shape that delivers the best overall aero performance at various wind angles.
We also found that, with proper integration, a disc-brake design can actually improve aerodynamic performance. The final step was to refine the entire system at Aero Concept Engineering in Magny-Cours, France. We created a new integrated Contact SLR/SL Aero handlebar/stem unit with internal cable routing and an integrated Giant SLR WheelSystem with aero spokes.
The rear wheel has a taller 65mm rim depth, proven in wind-tunnel testing to produce minimal drag. The front wheel, which is more affected by crosswinds, features a shallower 42mm rim. This further boosts the bike’s aerodynamic performance by lessening the effect of crosswinds on the front wheel while also reducing overall drag. To accurately simulate real-world riding conditions, our team of aerodynamics experts created a dynamic mannequin. Other bike manufacturers use static mannequins, but only a dynamic one can accurately replicate the effects of a rider pedaling with various wind angles.