Brain technology is a suspension system that automatically turns itself "on" and "off" almost instantaneously to always provide the perfect ride. It consists of an inertia valve mounted inside a near-vertical cylinder near the Epic's rear axle. The inertia valve controls the shock's ability to compress; the resulting system responds to terrain input (bumps and dips), but not to rider input (pedaling). Forces from the ground activate the inertia valve inside the Brain, which opens and allows the shock to absorb bumps. This means the bike climbs and sprints like a hardtail, yet is fully active for control and comfort over rough terrain.