RX 450 F

My26
My27

Beta’s ultimate expression of 4-stroke power in the cross world has evolved. The RX 450 F features an aggressive red and black livery and updated electronics, with a new control panel integrated into the handlebar guard, to better manage its powerful thrust in all racing conditions.

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449,3 CC

Displacement

97 mm

Bore

104,5 kg

Dry weight

335 mm

Ground clearance

main features

ELECTRONICS

ELECTRONIC MANAGEMENT: RACING TECHNOLOGY

The power delivery of the 450 4-stroke engine relies on systems derived directly from the world of racing. The controls for Launch Control—adjustable across five levels for optimal starts—Quick Shift for gear changes without closing the throttle, Traction Control and the two maps are now integrated into the updated control panel within the handlebar guard.

LOOK

The RX 450 F MY27 breaks with the past in terms of aesthetics, moving away from the traditional colour scheme in favour of an eye-catching red and black livery. This new look blends perfectly with the all-black structural components, such as the frame and tank.

DUNLOP TYRES

The model is fitted with new-generation Dunlop tyres, designed for intensive motocross use. Extremely efficient at transferring engine power to the ground, they offer a weight saving compared to their predecessors, greatly benefiting overall handling.

CHASSIS SPECIFIC TO THE 4-STROKE

While the tried-and-tested frame geometry remains unchanged, Beta’s engineers have developed new suspension settings for the Kayaba components (48 mm front fork and 50 mm monoshock) specifically for this model, designed to ensure maximum structural support during heavy landings from jumps.

NISSIN BRAKING SYSTEM

The Nissin system with 260 mm Galfer disks at the front and 240 mm at the rear remains a reliable choice, but has been enhanced by the adoption of a new 22 mm rear wheel shaft that increases the rigidity of the swingarm. The system ensures powerful and perfectly modulated braking to handle every hard braking manoeuvre at the limit.

COMPONENTS

The bike has evolved in its structural details: a new reinforced chain guide debuts to withstand the onslaught of mud and sand, combined with a redesigned pinion guard offering wider and safer coverage, in line with the most stringent competition regulations.

EXHAUST

The racing exhaust system remains a key element in optimising the power delivery curve of the RX 450 F. It ensures a responsive low-end and exceptional top-end performance, guaranteeing consistent performance throughout the entire race.

HANDLEBAR SILENT BLOCKS

The handlebars are isolated via silent block supports to dampen vibrations and reduce arm fatigue. For the MY27, 5 mm raised handlebar supports have been adopted to optimise seat posture, combined with new grips featuring a softer compound.

ELECTRIC STARTER AND LITHIUM BATTERY

Reliable and secure starting on the first attempt in any weather or racing conditions, ensured by the standard electric starter powered by an ultra-lightweight lithium battery.

RACING POWER AND CONTROL:
THE EVOLUTION OF THE SPECIES

The RX 450 F MY27 combines the power of its engine with benchmark usability. The striking aesthetic of the all-black frame and tank complements the effectiveness of the new Quick Shift and Launch Control systems, with 5 levels adjustable from the handlebars, offering the rider optimal control over the thrust to transform raw power into winning performance.

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manual brochure Tech Specs

CHASSIS

FRAME

Molybdenum steel with double cradle split above the exhaust port

Wheelbase

1475 mm

Max length

2170 mm

Max width

830 mm

Max height

1270 mm

Seat height

945 mm

Ground clearance

335 mm

Footrest height

422 mm

Dry weight

104,5 kg (front 51,4 kg; rear 53,1 kg)

Fuel tank capacity

7,0 l

Cooling system capacity

1,4 l

Front suspension

Hydraulic USD closecartridge fork with ø 48 mm shaft

Rear suspension

Monoshock with progressive compound lever

Shock absorber stroke

133 mm

Front wheel travel

305 mm

Rear wheel travel

300 mm

Front brake

Wave disc ø260 mm and double-piston floating caliper

Rear brake

Wave disc ø240 mm and single-piston floating caliper

Front rim

21 x 1,6 – 36 holes

Rear rim

19 x 2,15 – 36 holes

Front tyre

80/100 – 21

Rear tyre

110/90 – 19

ENGINE

Type

Single cylinder, 2-stroke, liquid-cooled

Bore

97 mm

Stroke

60,8 mm

Displacement

449,3 cc

Compression ratio

13,5:1

Valve train

DOHC finger follower / 4 valve, intake titanium, exhaust steel

Starter

Electric starter

ACG

Mitsuba

Spark plug

NGK LKAR 8A-9

Fuel system

Elldor electronic injection

Lubrication

2 oil pumps

Throttle body

Ø 46 mm

Clutch

Wet multi-disc clutch

Primary drive

Z. 31/72

Transmission

5 gears

Final transmission

Chain

Engine oil

SAE 10W/50 0,8 l. + SAE 10W/40 0,8 l.

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