Back to Bike FinderYears: 2024 · 2023 · 2021
Beta RR 4T 390
2021Off-road

Beta RR 4T 390

Key specifications

Engine
385 cc
Weight
108 kg
Fuel type
petrol
Fuel capacity
2.4 L
Transmission
6-speed
Seat height
37 mm
Front brakes
Single disc
Rear brakes
Single disc

Overview

Introducing the 2021 Beta RR 4T 390, a remarkable contender in the competitive world of enduro-offroad motorcycles. Designed for both seasoned riders and adventurous newcomers, this bike blends performance, agility, and cutting-edge technology to tackle the most challenging terrains. With its robust styling and striking red, white, and black color options, the RR 4T 390 not only performs exceptionally but also turns heads on the trails. Whether you’re racing through muddy paths or navigating rocky inclines, this motorcycle is engineered to provide an exhilarating experience that embodies the spirit of adventure. At the heart of the Beta RR 4T 390 is a powerful 385.4cc single-cylinder, four-stroke engine that delivers impressive torque and acceleration, allowing riders to conquer steep hills and technical sections with ease. With a compression ratio of 12.5:1 and a sophisticated Synerject dual electronic fuel injection system, this engine ensures smooth power delivery and optimal fuel efficiency. The 6-speed gearbox, paired with a wet multi-disc clutch, allows for seamless gear transitions, enhancing the riding experience. Thanks to its liquid cooling system, the engine maintains optimal performance even during extended rides in challenging environments, making it a reliable companion for long off-road adventures. The Beta RR 4T 390 is packed with features that elevate its performance and rider comfort. The sturdy molybdenum steel frame provides excellent stability and durability, while the hydraulic USD front fork with a generous 295mm travel ensures that the bike can absorb the toughest bumps and dips. The rear monoshock suspension, with its progressive compound lever, complements the front, delivering a balanced ride that instills confidence on any surface. With a ground clearance of 320mm and a lightweight frame tipping the scales at just 107.5 kg (237 pounds), this bike offers remarkable agility and maneuverability, making it a joy to ride in tight trails and rugged landscapes. **

Pros

  • Impressive Power-to-Weight Ratio: The lightweight design combined with a powerful engine ensures swift acceleration and agile handling, perfect for off-road challenges.
  • Advanced Suspension System: The high-quality suspension components provide excellent travel and dampening, allowing for smooth rides over rough terrain.
  • User-Friendly Technology: Features like electric start and variable ignition timing enhance the overall riding experience, making it accessible for riders of all skill levels.

Cons

  • Seat Height: At 940mm, the seat might be a challenge for shorter riders, potentially affecting comfort and confidence on the bike.
  • Fuel Capacity: With a fuel tank of 9.00 liters (2.38 gallons), longer rides may require additional planning for refueling, especially on remote trails.
  • Limited Color Options: While the red, white, and black aesthetic is striking, some riders may desire more customization options to reflect their personal style.

Technical details

Source specification data

Make
Beta
Model
RR 4T 390
Category
Enduro-offroad
Starter
Electric
Color Options
Red/white/black
Clutch
Wet multi-disc
Gearbox
6-speed
Ignition
C
-
I
without trembler with variable ignition timing,
Kokusan
type.
Fuel System
Carburettor
.
Synerject
dual electronic injection
Bore X Stroke
88.0 x 63.4 mm (3.5 x 2.5 inches)
Compression
12.5:1
Displacement
385.4 ccm (23.52 cubic inches)
Cooling System
Liquid
Engine Details
Single cylinder, four-stroke
Lubrication System
2 oil pumps
Transmission Type Final Drive
Chain
Dry Weight
107.5 kg (237.0 pounds)
Seat Height
940 mm (37.0 inches) If adjustable, lowest setting.
Fuel Capacity
9.00 litres (2.38 gallons)
Overall Width
815 mm (32.1 inches)
Overall Height
1270 mm (50.0 inches)
Overall Length
2180 mm (85.8 inches)
Ground Clearance
320 mm (12.6 inches)
Reserve Fuel Capacity
3.89 litres (1.03 gallons)
Rear Tyre
140/80-18
Frame Type
Molybdenum steel with double cradle split above the exhaust port
Front Tyre
90/90-21
Rear Brakes
Single disc
Front Brakes
Single disc
Rear Suspension
Monoshock with progressive compound lever
Front Suspension
Hydraulic USD fork with ø48mm shaft
Rear Wheel Travel
290 mm (11.4 inches)
Front Wheel Travel
295 mm (11.6 inches)

Available colors

Red/white/black