2025 Beta 300 RX Base

2025 Beta 300 RX Base

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Exterior Colors:

  • Year 2025
  • Make Beta
  • Model 300 RX
2025 Beta 300 RX Base

2025 Beta 300 RX Base

2025 Beta 300 RX

Beta USA entered the motocross world in 2021 with the introduction of their 300 RX, a 2-stroke model that provided a solid platform in design, handling, and looks. Along with the beauty of the bike, the “factory sound” of the 293cc motor was like no other. Riders quickly discovered what Beta likes to call Rideability. Rideability is the smoothness, ease of handling, and overall comfort experienced on a Beta Motorcycle. It encompasses factors such as throttle response, suspension performance, ergonomic design, and stability all contributing to a seamless ad enjoyable riding experience. Rideability is the perfect balance of power and agility that provides riders with confidence inspiring control and effortless maneuverability, resulting in a gratifying ride, no matter the conditions.

For the 2025 season, Beta is proud to release the details of the 300 RX updates to enhance its platform. Updates to the 300 include changes to the engine, chassis, and suspension. A new frame highlights the model, one that mimics that of its older 450 brother.

Features may include:

  • Engine

Updated Cylinder porting and matched cylinder head along with new ignition timing has increased the bike's overall power. The engine pulls harder and longer.

  • Frame

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.

  • Exhaust

An updated expansion chamber attached to a shorter silencer specific for moto.

Engine

Engine Type Beta Built single cylinder, 2-stroke, with BPV power valve system and counter balancer, electric start with back-up kick starter sold as an option
Cooling System Liquid Cooled
Displacement 293.1cc
Bore 72mm
Stroke 72mm
Compression Ratio 13.3:1
Lubrication Pre-Mix
Ignition AC-CDI Kokusan
Spark Plug NGK BR8ECM
Valve train Beta Progressive Valve (BPV)
Fuel System Keihin PWK 38mm

Drivetrain

Clutch Wet Diaphragm-style
Transmission 5 Speed
Final Drive O-ring chain

Chassis

Frame Type Molybdenum steel / Double Cradle w/ quick air filter access
Exhaust Beta Progressive Valve (BPV)

Suspension

Front Suspension 48 mm KYB AOS Closed Cartridge with adjustable compression & rebound
Rear Suspension KYB 50 mm body with adjustable rebound and high/low speed on compression adjustment
Front Wheel Travel 12.0"
Rear Wheel Travel 11.8"

Brakes

Front braking system 260 mm floating rotor
Rear braking system 240 mm rotor

Wheels & Tires

Front Wheel Rim: 21"
Rear Wheel Rim: 19"
Front Tire Michelin Starcross
Rear Tire Michelin Starcross

Dimensions

Wheelbase 58.6"
Seat Height 37.2"
Ground Clearance 13.4"
Height Footrest: 16.6"

Capacities

Fuel Capacity Tank: 1.8 US Gallons

Weights

Dry Weight 219 lbs

Product Photography