Name: Beta RX 450 4T 2026
Brand: Beta
Price: 9294.99 GBP
Availability: InStock

Beta RX 450 4T 2026

£9,294.99

Beta RX 450 4T 2026

£9,294.99

Beta has added two new motocross models to join the big brother 450 in the RX range. All-new 250 and 350 RX 2 strokes are the new bosses in town! Beta’s 450 RX has been racing on the world MXGP tour for four years and the AMA USA Supercross series for two and has proven to be a serious contender. The Italian Beta engineers decided to “Go Big” for 2026 and add not only a 250 cc bike to race in the proper classes but also added a 350 RX smoker as well for everyone else! All Beta MX models are designed with the trademark RideAbility in mind. A motorcycle that is overall easier to ride.

450 RX: Proven through races all over the world, including the USA Supercross series and MXGP. The 450 RX provides a ride like no other, quick turning yet stable; powerful yet easy to ride, are just a few things the press is saying about the 4-stroke model. An engine with enough power for a top-level pro rider while providing the right amount of power to the amateur as well. For 2026, the 450 RX receives a new cylinder head with improved flow that provides even more power. This, along with a matched intake manifold and a new exhaust, means the 450 will still bark with power but do it in a quieter way. A redesigned counterbalance shaft to reduce vibration and new mapping to go with the new cylinder head and exhaust.

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 all conditions. This achievement was possible due to a new cylinder head with a performance-enhancing piston, 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 air circulation inside the engine. The new manifold, following the flow line, has a longer internal horn to improve 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 was introduced to contain vibrations and reduce rider fatigue.

Exhaust system: the head-pipe has been redesigned to create a greater flow and to provide increased power. This new 4-stroke exhaust system is completed by a silencer, redesigned with HGS to contain the DB output, in line with the new racing standards.

Maps: Updated to perform better with the new motor configuration, with renewed start-up and limiter strategies.

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.

Handlebar silent block: Xtrig Flexfit bar mounts provide a comfortable grip on the handlebar for enhanced control and reduced vibration.

Lithium battery: lighter and a must for quick starts.

Chain: non o-ring, lighter and smoother.

Nissin braking system: with floating callipers and 260mm Galfer discs at the front and 240mm at the rear, for powerful and modular braking.

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.

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.

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.

Radiators: their bearing structure was strengthened to prevent any deformation that might affect their operation, even during heavy-duty use.

Graphics: a modern race look, simple yet bold, the final touch to the Italian RX range.

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

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.