The 2026 Beta 350 RX is an all-new, big-bore two-stroke motocross bike that replaces the previous 300 RX model. It is designed to offer a unique "bridge" between classes, providing the agility of a 250 with the linear power delivery typically found in four-stroke engines. The heart of the 350 RX is a purpose-built 351.7cc engine designed for smooth, exploitable power rather than aggressive hits. Beta has updated the platform for 2026 with a focus on stiffness and reliability.