For years, Beta has built its reputation around capable enduro motorcycles, earning a loyal following among trail and hard-enduro riders. Now the Italian manufacturer is putting more emphasis on motocross, expanding its RX range into a complete line-up that includes both two-stroke and four-stroke models.
The latest family consists of the RX 2T 250, RX 2T 350, RX 4T 250 and the flagship RX 4T 450, giving riders another European option in a class traditionally dominated by Japanese and Austrian manufacturers.
BETA Expands Its Motocross Line-up
While Beta remains best known for its enduro machines, the company’s motocross programme has been steadily developing through international competition, including MXGP and AMA Supercross. That racing experience has filtered into the production RX range, which is designed specifically for motocross rather than just a modified enduro machine.
For riders looking at four-strokes, Beta now offers the RX 4T 250 alongside the flagship RX 4T 450.
On the two-stroke side, the range consists of the RX 2T 250 and the all-new RX 2T 350, broadening the choices available to riders who still appreciate the simplicity and character of premix-powered motocross machines.
A look at the RX 4T 450
The RX 4T 450 is powered by a 449.3 cc liquid-cooled, fuel-injected single-cylinder engine with double overhead camshafts and electric start. For the latest model, Beta has revised the engine with a redesigned cylinder head, updated piston, intake system and exhaust to improve combustion efficiency and broaden the usable torque curve. A revised counterbalancer reduces vibration while maintaining the strong power expected from a modern 450 motocross machine.
The engine is paired with a five-speed gearbox and hydraulic clutch, while electronic fuel injection manages fuel delivery across varying track conditions.
KYB Suspension
Suspension duties are handled by fully adjustable KYB components at both ends. Up front is a 48 mm KYB AOS upside-down fork, while the rear uses a fully adjustable KYB shock working through a linkage system.
The RX chassis is purpose-built for motocross, using a chrome-moly steel frame designed to cope with repeated jump landings and aggressive cornering loads. Beta has also retained an aluminium rear subframe to keep weight under control while simplifying maintenance.
Brakes and Wheels
Braking comes courtesy of Nissin components working with Galfer discs. A 260 mm front disc and 240 mm rear disc provide stopping power, while floating calipers are used at the front.
The bike rolls on traditional motocross wheel sizes with a 21-inch front and 19-inch rear wheel, fitted with race-oriented tyres. The combination remains the benchmark configuration for full-size motocross competition.
Frame & Chassis
Unlike Beta’s enduro models, the RX 4T 450 is built around a chassis developed specifically for motocross. The chrome-moly steel perimeter frame has been engineered to provide the rigidity needed for hard landings and aggressive cornering, while still offering the controlled flex characteristics riders expect from a modern MX machine. An aluminium rear subframe helps keep weight in check, and the overall layout is designed to centralise mass while providing easy access for routine maintenance.
Rider Ergonomics
Like Beta’s enduro models, the RX adopts a slim rider triangle intended to allow easy movement around the motorcycle. Narrow bodywork, a flat seat profile and compact radiator shrouds are aimed at making weight transfers easier during braking, cornering and jumping.
Practicality hasn’t been forgotten either, with tool-free access to the air filter helping simplify routine maintenance between motos.
Electronics
One area where the RX 4T 450 stands out is its electronics package. Riders have access to two selectable engine maps, allowing the power delivery to be tailored to different track conditions, while four-level traction control can be adjusted or switched off entirely.
Borrowing technology developed through Beta’s racing programme, the RX 4T 450 also features a five-level Launch Control system designed to help riders get off the line consistently. A Quick Shift function allows clutchless upshifts without rolling off the throttle, while all of the electronic rider aids including Launch Control, Quick Shift, Traction Control and the two engine maps are controlled via an updated switch cluster integrated into the handlebar guard.
From Enduro Specialist to Full Motocross Contender
Beta’s expansion into motocross reflects the company’s ambition to compete across more off-road disciplines. With a dedicated four-model RX range covering both two-stroke and four-stroke platforms, the manufacturer is offering riders another option in the highly competitive motocross market. Whether riders are considering the RX 2T 250, RX 2T 350, RX 4T 250 or flagship RX 4T 450, Beta’s motocross family is now considerably broader than the single-model offering that first introduced the brand to MX competition.
For more info or to order one, speak to your local Beta Dealer.
