Motocross Bikes
2026Beta Rx 4T 450
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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.
- Capacity
- 449.3 ccm
- Engine
- Single, four-stroke
- Gearbox
- 5-speed
- Dry weight
- 104.5 kg
- Seat height
- 945 mm
- Power
- Not on record
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How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- 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.
- Built for
- 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.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 449.3 ccm
- Engine type
- Single, four-stroke
- Bore x stroke
- 97.0 x 60.8 mm
- Compression
- 13.5:1
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- Kokusan.
- Valves per cylinder
- 4
- Lubrication system
- 2 oil pumps
- Spark plugs
- NGK LKAR 8A-9
- Power
- Not on record - add it
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet multi-disc
Dimensions & weight
- Wheelbase
- 1485 mm
- Overall length
- 2170 mm
- Overall width
- 825 mm
- Overall height
- 1270 mm
- Seat height
- 945 mm
- Dry weight
- 104.5 kg
- Fuel capacity
- 7.00 litres
- Ground clearance
- 330 mm
Chassis & suspension
- Frame
- Molybdenum steel with double cradle split above the exhaust port
- Front suspension
- Hydraulic USD close cartridge fork
- Rear suspension
- Monoshock with progressive compound lever
- Front wheel travel
- 305 mm
- Rear wheel travel
- 305 mm
- Fork tube size
- 48 mm
Brakes & wheels
- Front brakes
- Single disc. Double-piston floating caliper. Wave disc.
- Rear brakes
- Single disc. Single-piston floating caliper. Wave disc.
- Front tyre
- 80/100-21
- Rear tyre
- 110/90-19
Other
- Color options
- Blue/red/white
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2025 | 2026 | 2027 |
|---|---|---|---|
| Capacity | 449 cc | 449 cc | 449 cc |
| Dry weight | 105 kg | 105 kg | 105 kg |
| Seat height | 945 mm | 945 mm | 945 mm |
| Fuel capacity | 7 L | 7 L | 7 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Beta Rx 4T 450?
The 2026 Beta Rx 4T 450 has a Capacity of 449.3 ccm (27.42 cubic inches).
How many gears does the Beta Rx 4T 450 have?
The 2026 Beta Rx 4T 450 has a Gearbox of 5-speed.
How much does the Beta Rx 4T 450 weigh?
The 2026 Beta Rx 4T 450 has a Dry weight of 104.5 kg (230.4 pounds).
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