2025 Beta 450 RX

RedNew Motorcycles

MSRP

$10,999

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In 2024, Beta launched the 450 RX model that would show off the talents of the engineering team based in Florence, Italy. The 450 RX 4 stroke had been tested in the prestigious MXGP class for more than three years as a factory prototype model. The production version of this prototype was very well received by riders as well as the media. The 2025 RX model continues the Beta Rideability mission in Motocross. 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.

The 2025 450 RX model received updates bringing it closer to perfection than ever. Updates to sharpen the model’s weapons, ready to do battle on MX tracks throughout the USA. An even-stronger rear aluminum subframe, suspension upgrades, as well as a more powerful lithium battery are just a few.

Features: Updated rear subframe that has been reinforced to add stiffness and strength in key areas, updated valving in the rear shock for better overall performance, new lithium battery to ensure quick starts, 51 tooth rear sprocket for quicker spin-up of the power delivery, XTrig FlexFix handlebar mounts, larger rear axle diameter to reduce flex and provide better durability, five speed transmission, upgraded footpegs with enhanced grip and less bulk, updated engine mapping with latest setting tested by Beta race team, MAP switch and tractional control to adjust power delivery, three throttle pulleys with different ratios come standard with the 450 RX to allow riders to configure settings to their liking, electric starter, and easy access air filter box.

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2025 Beta 450 RX

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

Features

  • 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.
  • FINAL RATIO / REAR AXLE: Rear sprocket has been replaced with a 51 tooth for a quicker "spin-up" of the power delivery. The rear axle diameter has been increased to 22 mm to reduce flex as well as provide better durability.
  • FOOTPEGS: Enhanced grip performance while being less bulky so rider can maintain control at all times.
  • HANDLEBAR MOUNTS: Xtrig FlexFix isoelastic bar mounts reduce rider fatigue and vibration. Also allows for flexibility in handlebar adjustment.
  • SUB-FRAME & FILTER BOX: Subframe has been reinforced in key points that stiffen and strengthen it, maintaining lightness and ability to adsorb 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 48 mm KYB front fork and the rear shock have been updated with new valving for better overall performance.

General Information

Manufacturer
Beta
Model Year
2025
Model
450 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 - Maxxis

Dimensions

Height
Footrest - 16.1 in.
Weight
Dry - 229 lb. (wet weight, no fuel)
Ground Clearance
13 in.
Wheelbase
58.4 in.
Seat Height
37.2 in.

Drivetrain

Transmission
5 speed
Final Drive
DID drive chain

Engine

Engine
4 –stroke, 4-valve
Cooling
Liquid
Cylinders
Single
Displacement
449.3 cc
Bore x Stroke
3.8 x 2.3 in. (97 x 60.8 mm)
Compression Ratio
13.5:1
Clutch
Hydraulic, adjustable diaphragm multi-plate
Fuel System
46 mm Throttle Body with Dual Injectors
Exhaust
Valve - Finger followers with shim adjustment
Ignition

Dual-Map Kokusan with Traction Control

Spark Plug - NGK LKAR8A-9

Starting
Electric
Lubrication
Twin Oil Pumps with Cartridge Filter and Separate Compartments for Engine and Transmission
Fuel Capacity
1.8 US gal.

Operational

Frame
Molybdenum steel / Double Cradle with push button seat and quick air filter access
Front Suspension

48 mm KYB AOS closed cartridge fork, 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.