What category is the 2026 Beta Rx 4T 450?

The 2026 Beta Rx 4T 450 has a Category of Cross / motocross.

What is the engine size of the 2026 Beta Rx 4T 450?

The 2026 Beta Rx 4T 450 has a Capacity: of 449.3 ccm (27.42 cubic inches).

What type of engine does the 2026 Beta Rx 4T 450 have?

The 2026 Beta Rx 4T 450 has a Engine type of Single cylinder, four-stroke.

How many gears does the 2026 Beta Rx 4T 450 have?

The 2026 Beta Rx 4T 450 has a Gearbox of 5-speed.

Beta Rx 4T 450 - 2026 Specifications and Reviews

Name: 2026 Beta Rx 4T 450
Brand: Beta

The Beta RX 4T 450 is a competitive 449cc four-stroke motocross bike engineered for serious off-road racers and experienced riders. Its titanium-valved engine delivers aggressive power through a 13.5:1 compression ratio and electronic fuel injection, while the liquid-cooled DOHC design ensures reliability in intense racing conditions. Known for precise handling and race-ready performance, it excels in cross and motocross competition.

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General information
Color Options	Blue/red/white
Category	Cross / motocross
Model	Beta RX 4T 450

Engine and Transmission Specifications
Starting	Electric
Clutch	Wet multi-disc
Final Drive	Chain (final drive)
Gearbox	5-speed
Cooling System	Liquid
Ignition	Kokusan.
Fuel Control	Double Overhead Cams/Twin Cam (DOHC)
Induction	Injection. Elldor electronic injection, 46mm
Valves Per Cylinder	4
Bore x Stroke	97.0 x 60.8 mm (3.8 x 2.4 inches)
Compression Ratio	13.5:1
Engine Details	Titanium valves
Capacity:	449.3 ccm (27.42 cubic inches)
Physical measures and capacities
Fuel Capacity	7.00 litres (1.85 US gallons)
Wheelbase	1485 mm (58.5 inches)
Ground Clearance	330 mm (13.0 inches)
Overall Width	825 mm (32.5 inches)
Overall Length	2170 mm (85.4 inches)
Overall Height	1270 mm (50.0 inches)
Seat Height	945 mm (37.2 inches) If adjustable, lowest setting.
Dry Weight	104.5 kg (230.4 pounds)

Beta Rx 4T 450 dimensions and frame
Wheels	Wire spoked with blue rims.
Rear Brakes	Single disc. Single-piston floating caliper. Wave disc.
Brake Disc Diameter	240 mm (9.4 inches)
Front Brakes	Single disc. Double-piston floating caliper. Wave disc.
Rear Tyre	110/90-19
Front Tyre	80/100-21
Rear Wheel Travel	305 mm (12.0 inches)
Rear Suspension	Monoshock with progressive compound lever
Front Wheel Travel	305 mm (12.0 inches)
Front Suspension	Hydraulic USD close cartridge fork
Frame	Molybdenum steel with double cradle split above the exhaust port
Other specs
Maintenance	Find parts, fluids, filters, maintenance tools and service items on eBay
Fork tube size	48 mm (1.9 inches)
Spark plugs	NGK LKAR 8A-9
Coolant	1.00 litres (0.26 US gallons)
Engine oil	SAE 10W/45
Update specs	Report missing specs or required updates.
Lubrication system	2 oil pumps
Engine type	Single cylinder, four-stroke
Year	2025

Performance Profile & Rider Fit

Best For

Track55%

City15%

Cornering80%

Daily Riding15%

Touring20%

Passenger5%

Rider Profile

Best For	This is a competition-focused enduro/cross machine best suited to riders with intermediate to advanced off-road skill, as its high seat height, light dry weight, and aggressive suspension travel reward confident, active riding rather than a relaxed beginn
Purpose	Built for motocross and cross-country competition use, it excels at tackling rough terrain, jumps, and technical trails rather than serving as a road or commuter bike.
Rider Fit	At around 104.5 kg dry with a tall 945 mm seat height, it demands a rider with decent height, leg strength, and fitness to manage standing maneuvers, hard braking, and low-speed balance over obstacles.
Character	The titanium-valve DOHC four-stroke engine, long-travel USD forks, and lightweight molybdenum steel frame give it a sharp, high-revving, and razor-agile character typical of a purebred cross/motocross weapon.
Not Ideal For	It is not a good fit for riders wanting a comfortable daily commuter, a passenger-friendly bike, or long-distance road touring, since its tiny fuel tank, firm racing suspension, and lack of road-oriented equipment make sustained street use impractical.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Fit Visualizer

2026 Beta Rx 4T 450 Rider Ergonomics Assessment

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Feet:

At 945mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2026 Beta Rx 4T 450, with a cramped knee angle of around 85 degrees and an upright riding position.

Data quality: measured. Assumes about 30mm of suspension sag once seated (a typical street-bike rule of thumb - stiffer or softer suspension will vary). This is an approximation from category-typical geometry and generic body proportions, not a measurement of this specific bike or you - sit on it before you buy.

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