MY25 RX 300 2T

Introducing the 2025 RX 300 2T!

While the RX 300 2T has been previously available as an enduro-derived bike for the motocross segment, the success of this project, and the ever-growing experience and insights gained on the RX 450 through the MXGP World Championship has lead the Tuscan brand to open the throttle on the RX 300, and configure it as a fully-fledged motocross bike.

For 2025, the RX 300 has undergone a series of important improvements to the engine, suspension and frame, which totally breaks away from the enduro world, and like the RX 450, it’s become a purpose-built bike, dedicated to motocross.

Within the vast range of changes across the board for the MY2025 RX range, the project’s goal remained the same: equip the bikes with a frame, engine and components of the highest level, and bring a new frontier of RideAbility to the MX world.

What does RideAbility mean for Beta? It means designing and building bikes with RideAbility being the core value. Each Betamotor-branded motorbike is designed by the Florentine manufacturer to provide any rider with a motorcycle that is simultaneously easy to ride, and offer high performance. A product that’s able to extract the best from any rider, thanks to an engine-frame combination that is able to offer a fun ride, without a reason to fear the world championship level performance of the engine.

Frame: the RX 300 sees a new frame, specifically dedicated to motocross that receives a wider main spar (10mm), and redesigned and reinforced sections compared to the enduro models, built to withstand the stresses of repeated jump landings and lateral twists seen in high-speed bends. This translates to a precise and stable bike when entering and leaving corners at speed. The engine mounts and position is different from the enduro models and provides excellent balance on the track.

Rear sub-frame and air filter housing: in line with the use of the new motocross frame, the new RX 300 receives an aluminium sub-frame, as well as the air filter housing.

Fork: The Kayaba (KYB) 48mm forks has greater travel than the enduro models, and receives new calibration that creates the perfect set-up together with the new single Kayaba shock, delivering a stable, fast and precise bike.

Single shock: the single 50mm Kayaba shock is a new addition to this model and delivers greater support in jump landing, thanks to the greater hydraulic braking within the shock, guaranteeing constant performance under heavy use.

Braking system: Featuring Nissin floating calipers, a 260mm disc at the front, and 240mm at the rear. The front sees a new caliper as used on the RX 450 which is smaller, lighter and performs better that the previous unit, offering great braking performance when letting off the throttle. At the rear, the new master cylinder as seen on the enduro RR Racing models delivers greater braking power.

Radiators: the RX 300 sees new radiators that are redesigned to offer a greater steering angle and optimised cooling.

Final ratio: the rear sprocket has 49 teeth, up from 48 for lightening fast acceleration.

Chain: the non o-ring chain is lighter and smoother than the previous one, all helping to make a difference on the track.

Engine and exhaust: a new engine adds to the extensive frame and suspension changes for MY2025 and brings the performance of the RX 300 to the top of its class. The totally new engine consists of a new cylinder, a new head with greater compression and modified intake crankcases to increase ventilation. The results of this is a power unit with significantly more power than that of the previous model, while maintaining the renowned low-speed power of the 300 2T, the peak maximum power at high speeds has also increased. The redesigned 5-speed gearbox helps get the power to the ground, with specific gear spacing for MX use, and with a stiffer spring that increases the preload on the clutch pack to prevent slippage. This new platform is perfectly tuned with dedicated mapping, new carburettor calibrations (Keihin PWK 38), and adjusted power valve. The exhaust system, also completely redesigned offers a dedicated expansion chamber and shorter silencer.

Silent handlebar block: new silent blocks reduce vibrations and raise the handlebar by 5mm compared to the previous model, aiding in rider grip, control and performance.

Footpegs: the range sees new, less bulky footpegs with an enhanced grip performance, providing greater control at all times.

Swingarm: the rear wheel axle is reinforced and now 22mm in diameter (+2mm). This new component guarantees greater stiffness and torsional resistance, resulting in a bike that is precise in its handling, even in the toughest of conditions.

Engine maps: both the RX models are equiped with with two specific engine maps (wet/dry)