2026 Beta Motocross

The wait is over

2026 Beta Motocross

Beta RX 4T 450 MY26 - Image 1
Beta RX 4T 450 MY26 - Image 2
Beta RX 4T 450 MY26 - Image 3
Beta RX 4T 450 MY26 - Image 4
Beta RX 4T 450 MY26 - Image 5
Beta RX 4T 450 MY26 - Image 6
Beta RX 4T 450 MY26 - Image 7
Beta RX 4T 450 MY26 - Image 8

Beta RX 4T 450 MY26

The wait is over

RRP: £9,295.00
  • RX 450 4T MY 2026
  • Wanna play with us? Beta lands on a new fun dimension, with the new RX My2026, proving to believe in the MX project like never before. It expands its line and lays new foundations to develop a complete 2- and 4-Stroke model range.
  • Two all new models that will revolutionize the 2Str market join the updated RX 450 for MY26, asannounced at EICMA, during the new Champions Charity  Race with MotoGP and racing legends, the 2Str range welcomes the new 350cc engine, also joining the 2 Str RX family is the race-inspired RX 250!
  • The only thing left to do is choose one and hit the track for some fun! So, what does having fun on a Beta mean? One word, RideAbility. Each Betamotor-branded motorcycleis designed by the Italian manufacturer to provide any rider with a bike which is simultaneously easy to ride yet high in performance. A product able to get all the best from any rider, thanks to an engine-frame combination which is able to provide a fun ride, without reason to ever fear the world championship- level performance of the engine, making RideAbility its core value.
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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 48 kg; Rear 52 kg)

Fuel Tank

  • Capacity: 7.0 L

Cooling System

  • Capacity: 1.4 L

Front Suspension

  • Type: Hydraulic USD close-cartridge fork
  • Fork Diameter: Ø 48 mm
  • Wheel Travel: 305 mm

Rear Suspension

  • Type: Monoshock with progressive compound lever
  • Shock Absorber Stroke: 133 mm
  • Wheel Travel: 300 mm

Brakes

  • Front: Wave disc Ø 260 mm with double-piston floating caliper
  • Rear: Wave disc Ø 240 mm with single-piston floating caliper

Wheels & Tyres

  • Front Rim: 21 × 1.6 – 36 holes
  • Rear Rim: 19 × 2.15 – 36 holes
  • Front Tyre: 80/100 – 21
  • Rear Tyre: 110/90 – 19

Engine

  • Type: Single-cylinder, 2-stroke, liquid-cooled
  • Bore × Stroke: 97 × 60.8 mm
  • Displacement: 449.3 cc
  • Compression Ratio: 13.5 : 1

Valve Train & Exhaust

  • Valve Train: DOHC finger follower / 4 valves, intake titanium, exhaust steel

Ignition & Electrical

  • Starter: Electric starter
  • ACG: Kokusan
  • Spark Plug: NGK LKAR 8A-9

Fuel & Lubrication

  • Lubrication: 2 oil pumps
  • Fuel System: Elldor electronic injection
  • Throttle Body Diameter: Ø 46 mm

Transmission

  • Clutch: Wet multi-disc clutch
  • Primary Drive: Z. 31 / 72
  • Gearbox: 5-speed
  • Final Transmission: Chain

Engine Oil

  • SAE 10W/50 + SAE 10W/40 (0.8 L)

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About John Lee Motorcycles

John started work in the Motorcycle Trade in 1955, working for 2 large London Dealers for 10 years. His ambition was to own his own dealership, so moved to Northamptonshire and purchased the shop where we are today in Higham Ferrers, that was 1964.

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