The 2026 Beta 450 RX is Beta’s high-performance 450cc motocross machine, combining serious race-winning power with the precise handling and rider-focused ergonomics Beta is known for. For 2026, Beta made major engine updates to deliver stronger torque and a broader, more usable powerband while keeping the bike controllable and predictable on the track.
At the heart of the RX is a 449.3cc liquid-cooled, single-cylinder four-stroke engine with a 5-speed transmission, electric start, dual engine mapping, and traction control. The 2026 model features a newly developed cylinder head, revised intake manifold, performance-enhanced piston, redesigned exhaust system, and updated engine mapping for improved overall performance.
449.3cc 4-stroke, 4-valve engine
5-speed transmission
Electric start
46mm throttle body
Dual-map ignition with traction control
Adjustable hydraulic diaphragm multi-plate clutch
48mm KYB AOS closed-cartridge front fork
KYB rear shock with progressive linkage
260mm floating front brake rotor
240mm rear brake rotor
21" front / 19" rear wheels
DID rims
80/100-21 front tire
110/90-19 rear tire
1.5-gallon fuel capacity
37.2" seat height
13.2" ground clearance
58.1" wheelbase
230.4 lb dry weight
The 2026 Beta 450 RX is Beta’s high-performance 450cc motocross machine, combining serious race-winning power with the precise handling and rider-focused ergonomics Beta is known for. For 2026, Beta made major engine updates to deliver stronger torque and a broader, more usable powerband while keeping the bike controllable and predictable on the track.
At the heart of the RX is a 449.3cc liquid-cooled, single-cylinder four-stroke engine with a 5-speed transmission, electric start, dual engine mapping, and traction control. The 2026 model features a newly developed cylinder head, revised intake manifold, performance-enhanced piston, redesigned exhaust system, and updated engine mapping for improved overall performance.
449.3cc 4-stroke, 4-valve engine
5-speed transmission
Electric start
46mm throttle body
Dual-map ignition with traction control
Adjustable hydraulic diaphragm multi-plate clutch
48mm KYB AOS closed-cartridge front fork
KYB rear shock with progressive linkage
260mm floating front brake rotor
240mm rear brake rotor
21" front / 19" rear wheels
DID rims
80/100-21 front tire
110/90-19 rear tire
1.5-gallon fuel capacity
37.2" seat height
13.2" ground clearance
58.1" wheelbase
230.4 lb dry weight