Race-bred power. Smarter electronics. Built for the motocross track.
The 2027 Beta RX 450F 4-Stroke is Beta's flagship four-stroke motocross machine, combining a powerful 449.3cc liquid-cooled single-cylinder engine with KYB suspension and a race-focused chassis. Developed for closed-course competition, the RX 450F is designed to deliver strong power while maintaining the predictable, controllable handling that Beta calls its RideAbility philosophy.
For 2027, Beta focused heavily on refining the RX 450F's engine power delivery and electronic controls. The bike now adds 5-level Launch Control and Quick Shift to its existing dual engine maps and Traction Control. All of these functions are managed through a redesigned integrated control panel, allowing riders to quickly adapt the bike to changing track and traction conditions.
Engine: 449.3cc liquid-cooled 4-stroke single-cylinder
Bore x Stroke: 97mm x 60.8mm
Compression Ratio: 13.5:1
Valvetrain: 4-valve
Fuel System: EFI with 46mm tapered throttle body
Starting: Electric
Transmission: 5-speed
Clutch: Hydraulic diaphragm multi-plate
Front Suspension: 48mm KYB AOS
Rear Suspension: KYB shock with linkage
Front Travel: 12.0"
Rear Travel: 11.8"
Front Brake: 260mm floating rotor
Rear Brake: 240mm rotor
Front Wheel: 21"
Rear Wheel: 19"
Tires: Motocross competition tires
Seat Height: 37.2"
Ground Clearance: Approximately 13"
Fuel Capacity: 2.4 gallons
Dry Weight: Approximately 229 lbs
Race-bred power. Smarter electronics. Built for the motocross track.
The 2027 Beta RX 450F 4-Stroke is Beta's flagship four-stroke motocross machine, combining a powerful 449.3cc liquid-cooled single-cylinder engine with KYB suspension and a race-focused chassis. Developed for closed-course competition, the RX 450F is designed to deliver strong power while maintaining the predictable, controllable handling that Beta calls its RideAbility philosophy.
For 2027, Beta focused heavily on refining the RX 450F's engine power delivery and electronic controls. The bike now adds 5-level Launch Control and Quick Shift to its existing dual engine maps and Traction Control. All of these functions are managed through a redesigned integrated control panel, allowing riders to quickly adapt the bike to changing track and traction conditions.
Engine: 449.3cc liquid-cooled 4-stroke single-cylinder
Bore x Stroke: 97mm x 60.8mm
Compression Ratio: 13.5:1
Valvetrain: 4-valve
Fuel System: EFI with 46mm tapered throttle body
Starting: Electric
Transmission: 5-speed
Clutch: Hydraulic diaphragm multi-plate
Front Suspension: 48mm KYB AOS
Rear Suspension: KYB shock with linkage
Front Travel: 12.0"
Rear Travel: 11.8"
Front Brake: 260mm floating rotor
Rear Brake: 240mm rotor
Front Wheel: 21"
Rear Wheel: 19"
Tires: Motocross competition tires
Seat Height: 37.2"
Ground Clearance: Approximately 13"
Fuel Capacity: 2.4 gallons
Dry Weight: Approximately 229 lbs