2025 Beta 300 RX

RedNew Motorcycles

MSRP

$9,499

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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: New durable frame similar to the 450 RX, new design of the rear master cylinder for reduced temperatures and better feel, new aluminum sub-frame, updated cylinder porting and new ignition timing to increase the bike's overall power, five speed transmission, upgraded footpegs with enhanced grip and less bulk, updated expansion chamber, narrower radiators for greater turning radius, updated rear shock with larger body to reduce the oil temperature under extreme use, XTrig FlexFix handlebar mounts, smaller fuel tank, MAP switch to adjust power delivery, adjustable power valve, electric starter, and easy access air filter box.

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2025 Beta 300 RX

Condition
New
Category
Motorcycles
Model Type
Motocross
Model Code
NA
Color
Red

Features

  • 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.
  • SUSPENSION: Closed cartridge 48 mm KYB front fork and the rear shock have been updated with new valving for better overall performance. 50 mm shock body reduces the oil temperatures under extreme use during long motos.
  • HANDLEBAR MOUNTS: Xtrig FlexFix isoelastic bar mounts reduce rider fatigue and vibration. Also allows for flexibility in handlebar adjustment.
  • ALUMINUM SUB FRAME: Similar to the 450 RX the sub frame on the 300 RX is fabricated from aluminum for more strength.
  • FOOTPEGS: Enhanced grip performance while being less bulky so rider can maintain control at all times.
  • BODYWORK: Along with the aluminum sub-frame, 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.

General Information

Manufacturer
Beta
Model Year
2025
Model
300 RX
Model Code
NA
Color
Red

Brakes/Wheels/Tires

Brakes

Front - 260 mm floating rotor

Rear - 240 mm rotor

Rims

Front - 21 in.

Rear - 19 in.

Tires
Front / Rear - Michelin Starcross

Dimensions

Height
Footrest - 16.6 in.
Weight
Dry - 219 lb. (wet weight, no fuel)
Ground Clearance
13.4 in.
Wheelbase
58.6 in.
Seat Height
37.2 in.

Drivetrain

Transmission
5 Speed
Final Drive
O-ring chain

Engine

Engine
Beta built, 2-stroke, with BPV power valve system and counter balancer
Cooling
Liquid
Cylinders
Single
Displacement
293.1 cc
Bore x Stroke
2.8 x 2.8 in. (72 x 72 mm)
Compression Ratio
13.3:1
Clutch
Wet diaphragm-style
Fuel System
Keihin PWK 38 mm
Carburetion
Kelhin PWK 38 mm
Exhaust
Valve - Beta Progressive Valve (BPV)
Ignition

AC-CDI Kokusan

Spark Plug - NGK BR8ECM

Starting
Electric
Lubrication
Pre-mix
Fuel Capacity
1.8 US gal.

Operational

Frame
Molybdenum steel / double Cradle with quick air filter access
Front Suspension

48 mm KYB AOS Closed Cartridge with adjustable compression and rebound

Wheel Travel - 12 in.

Rear Suspension

KYB 50 mm body with adjustable rebound and high / low speed on compression adjustment

Wheel Travel - 11.8 in.

Gallery

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Due to continued challenges across supplier networks as well as increasing logistics costs, product pricing, freight charges, specifications, and features are subject to change at any time without prior notice. Please confirm all information with your local dealership.

Images, where available, are presented as reasonable facsimiles of the offered unit and/or manufacturer stock images. Non-standard options or features may be represented. No guarantee of availability or inclusion of displayed options should be inferred; contact the dealer for more details.

  • Price, if shown and unless otherwise noted, represents the Manufacturer's Suggested Retail Price (MSRP) or dealer unit price and does not include government fees, taxes, dealer vehicle freight/preparation, dealer document preparation charges, labor, installation, or any finance charges (if applicable). MSRP and/or final sales price will vary depending on options or accessories selected; contact dealer for more details.

  • Images, where available, are presented as reasonable facsimiles of the offered unit and/or manufacturer stock images. Non-standard options or features may be represented. No guarantee of availability or inclusion of displayed options should be inferred; contact dealer for more details.