Beta announce their 2025 RX model range, the 300cc two-stroke and 450 4T closed-course, motocross bikes on the money for cross country and sprint enduro racing get chassis and engine updates.

More power for the 300cc two-stroke? Oh yes, we like that. Catching Brad Freeman flying around a sprint enduro last month on his 300 RX was a treat, it looks and sound awesome.

Beta entered the motocross world in 2021 with the 300 RX, a two-stroke model that upgraded their enduro machines. As they point out, the “factory sound” of the 293cc motor was like no other and showed the potential of the Italian manufacturer’s two-stroke engine pedigree.

Since then Beta have entered the MXGP world championship with another model, the 450 RX four-stroke, still very much a work in progress in terms of results.

But in terms of customer production bikes, the two models, especially the 300, have proved popular with anyone who jumped on onboard chiefly because of its rideability and tractable power.

New frames and more power

For the 2025 season, Beta has updated both the 300 and 450 RX with changes to the 300 engine, chassis/frame, and suspension. The 450 RX model also gets a stronger rear aluminium subframe, suspension upgrades, as well as a more powerful lithium battery – all the details below...

MY25 Beta RX model new features and updates:

300 RX two-stroke

• Frame: Similar to the 450, specifically dedicated for motocross use, Chro-moly with a larger backbone to increase stiffness while enhancing the turning. The new frame also has an updated mounting for the new rear brake master cylinder.
• Rear Brake Master Cylinder: New design, similar to the 450, large capacity for reduced fluid temperatures and better modulation and feel.
• Rear sub-frame and filter box: In line with the use of the new frame, the rear subframe is fabricated from aluminum similar to the 450. This new subframe along with the plastic tray system, allows for components under the seat such as the battery and starter solenoid to be more compact reducing the overall bulk. The tool-less push button seat removal system is also incorporated into the new subframe.
• Engine: Updated cylinder porting and new matched cylinder head along with a new ignition timing curve has increased the bike’s overall power. The engine pulls harder and longer with this new design. Combined with an all-new 5-speed gearbox specifically for motocross, finished off with a stiffer spring for the diaphragm clutch pack, all provide for a complete package.
• Footpegs: the 2025 model receives new, less bulky footpegs, with an enhanced grip performance provided to the rider's boot, to keep the bike under control at all times.
• Exhaust: An updated expansion chamber attached to a shorter silencer specific for Moto.
• Radiators: New design that allows for a greater turning radius.
• Suspension: Closed cartridge 48mm KYB front fork and the rear shock have been updated with new valving for better overall performance. The 300 receives a larger, 50mm shock body to reduce the oil temperatures under extreme use during long motos.
• Handlebar Mounts: Isoelastic handlebar mounts are used to reduce vibration, these bar mounts also raise the handlebar height 5mm.
• Bodywork: Along with the aluminum subframe, the rear plastic is now a three-piece design. A new, smaller fuel tank (1.8 gallon) has been installed to reduce the overall weight and center of gravity. The MAP switch has been moved to the handlebar pad for ease-of-use. 
• New Graphics and Colors: More “Italian” red showing off the heritage of the Beta brand, tied together with new graphics for 2025 bringing a fresh new look to the RX.

450 RX four-stroke

• Rear sub-frame and filter box: while the rear sub-frame's geometry and the filter box remain the same, the structure has been reinforced in a series of points that stiffen and strengthen it, maintaining lightness and ability to absorb stresses. Access to the filter remains on the left side of the bike and is extremely easy and requires no tools to access.
• Suspension: Closed cartridge 48mm KYB front fork and the rear shock have been updated with new valving for better overall performance.
• Battery: A stronger lithium battery ensures quick starts while remaining very light in weight.
• Final ratio: The rear sprocket has been replaced with a 51 tooth for a quicker “spin-up” of the power delivery.
• Handlebar Mounts: Isoelastic handlebar mounts are used to reduce vibration, these bar mounts also raise the handlebar height 5mm.
• Rear Axle: The rear axle diameter has been increased to 22mm to reduce flex as well as provide better durability.
• Footpegs: the 2025 model receives new, less bulky footpegs, with an enhanced grip performance provided to the rider's boot, to keep the bike under control at all times.
• New Graphics and Colors: More “Italian” red showing off the heritage of the Beta brand, tied together with new graphics for 2025 bringing a fresh new look to the RX.
• Updated Engine Mapping: The mapping has been updated with the latest settings that have been tested by the Beta race team. This along with traction control completes the electronic package of the RX model.
• Throttle Pulleys: Each 450 RX arrives with three extra throttle pulleys, all with a different ratio to allow riders to install the ratio to their liking.

Pricing (US only, Europe not known):

300 RX: $9,499

450 RX: $10,999

*plus a $489.00 destination fee, taxes, license, or other required fees.

Availability:

300 RX: August

450 RX: October

More information: www.betausa.com + www.betamotor.com

Technical specification: