Piloted to two Marathon World Championship titles and the Leadville 100 course record! The Ergon GS1 for Twist-Shift combines comfort and support in a lightweight package for endurance athletes. The exclusive German-produced rubber compound enables precise steering and control, all the while still maximizing optimized damping features. The grip provides ideal comfort over long distances through ultimate pressure distribution and ride-tuned flex. The package includes an optional adaptor for increased spacing according to the user's preference. This gives the rider a larger gripping position away from the Twist-Shift. Without it, a more compact position. Carbon bar compatible.