Cannondale's ECS-TC linkage
Cannondale's ECS-TC (Enhanced Center Stiffness–Torsion Control) technology eliminates flex or play in the links and bearings of your frame. Cannondale uses widely spaced, 15mm through-axles for the key pivots. The axle then becomes a structural part of the link or swingarm and radically increases your frame's ability to resist twisting loads and side-to-side movement.