Motocross Bikes
2027Beta Rx 4T 450
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The 2027 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, DOHC 4 single, four-stroke
- Gearbox
- 5-speed
- Dry weight
- 104.5 kg
- Seat height
- 945 mm
- Power
- Not on record
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What’s new for the 2027 Beta Rx 4T 450
vs the 2026| Spec | 2026 | 2027 |
|---|---|---|
| Front suspension | Hydraulic USD close cartridge fork | 48 mm KYB closed-cartridge USD fork |
| Rear suspension | Monoshock with progressive compound lever | KYB monoshock, progressive linkage |
| Front brakes | Single disc. Double-piston floating caliper. Wave disc. | Single 260 mm wave disc, 2-piston floating caliper |
| Rear brakes | Single disc. Single-piston floating caliper. Wave disc. | Single 240 mm wave disc, 1-piston floating caliper |
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, DOHC 4 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
- Power
- Not on record - add it
Transmission
- Gearbox
- 5-speed
- Transmission type
- 5-speed manual
- Final drive
- Chain
- Clutch
- Wet multi-disc
Dimensions & weight
- Wheelbase
- 1475 mm
- Overall length
- 2170 mm
- Overall width
- 830 mm
- Overall height
- 1270 mm
- Seat height
- 945 mm
- Dry weight
- 104.5 kg
- Fuel capacity
- 7.00 litres
- Ground clearance
- 335 mm
Chassis & suspension
- Frame
- Molybdenum steel with double cradle split above the exhaust port
- Front suspension
- 48 mm KYB closed-cartridge USD fork
- Rear suspension
- KYB monoshock, progressive linkage
- Front wheel travel
- 305 mm
- Rear wheel travel
- 300 mm
Brakes & wheels
- Front brakes
- Single 260 mm wave disc, 2-piston floating caliper
- Front brakes diameter
- 260 mm
- Rear brakes
- Single 240 mm wave disc, 1-piston floating caliper
- Rear brakes diameter
- 240 mm
- 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 2027 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 2027 Beta Rx 4T 450 has a Gearbox of 5-speed.
How much does the Beta Rx 4T 450 weigh?
The 2027 Beta Rx 4T 450 has a Dry weight of 104.5 kg (230.4 pounds).
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