RX 450 4T MY 2026

RX 450 4Str is the fans’ chance to ride a Made-in-Beta MX closely resembling the race bike that’s been running in the MXGP World Championship for five years now and in the American AMA Supercross series since 2024. The Model Year 2026 RX 450 has been updated with a massive performance step, making the power delivery close to that of the factory bikes, while keeping the brand’s signature easeof control intact.

RX 450 4Str

• Engine: the 450cc engine development was focused on providing riders a significant performance increase compared to the previous model, offering a stronger torque curve that can be used under allconditions. This achievement was possible due to a new cylinder head with a performance-enhancingpiston, a new intake manifold and a different exhaust system. The head’s overhaul – developed through CFD analysis and many flow bench calibrations – includes an improved intake duct to enhance aircirculation inside the engine. The new manifold, following the flow line, has a longer internal horn toimprove the tuning of pressure waves, and thus increase their fill while intaking air. The piston includes new coatings to reduce friction and improve its performance. A newly designed counter balancer wasintroduced to contain vibrations and reduce rider fatigue.
• Exhaust system: the head-pipe has been redesigned to create a greater flow and to provide increasedpower. This new 4Str exhaust system is completed by a silencer, redesigned with HGS to contain the DB output, in line with the new racing standards.
• Map: maps were updated to fair better with the new motor configuration, with renewed start-up and limiter strategies.
• Graphics: a modern race look, simple yet bold, the final touch to the Italian RX range.
• Radiators: their bearing structure was strengthened to prevent any deformation that might affect their operation, even during heavy-duty use.

The following elements are confirmed on the entire range:

• Frame: geometry remains unchanged, yet the frame now incorporates a cast-in brace to further strengthen the frame around the steering neck area. This increases the reliability and stiffness of the frame’s area most subject to stress. Aluminium rear sub-frame and dedicated filter box: aluminium gives the right level of stiffness to the structure. Light, yet has the rigidity to overcome the demands of motocross. Access to the filter remains on the left side of the bike, and is extremely easy and intuitive, as well as being tool free. The push button seat also removes without tools.
• Kayaba suspensions: fork (48mm) and single shock (50mm) are specifically calibrated on the new range models, focusing on their rideability and stability when the pace rises. The resulting setting is enough to make any rider confident, from amateurs to professionals.
• Nissin braking system: with floating callipers and 260mm Galfer discs at the front and 240mm at the rear, for powerful and modular braking.
• Chain: non o-ring, lighter and smoother.
• Lithium battery: lighter and a must for quick starts.
• Handlebar silent block: Xtrig Flexfit bar mounts provide a comfortable grip on the handlebar for enhanced control and reduced vibration.

To complete our round-up of the bike:

• Engine maps: all the RX models are equipped with two specific engine maps (wet and dry), while the 4- Stroke model has also four levels of Traction Control (on/off/active with hard map/active with soft map) to manage the vehicle’s significant power in all terrain conditions. The button to select the map and TC is located on the handlebar bumpers. All RX will be supplied with personalized kickstand. In addition, the 4Str has four different throttle pulleys to customize the accelerator’s response.

Availability

June