What category is the 2026 Beta RR Racing 4T 390?

The 2026 Beta RR Racing 4T 390 has a Category of Enduro / offroad.

What is the engine size of the 2026 Beta RR Racing 4T 390?

The 2026 Beta RR Racing 4T 390 has a Capacity: of 385.6 ccm (23.53 cubic inches).

How many gears does the 2026 Beta RR Racing 4T 390 have?

The 2026 Beta RR Racing 4T 390 has a Gearbox of 6-speed.

Beta RR Racing 4T 390 - 2026 Specifications and Reviews

Name: 2026 Beta RR Racing 4T 390
Brand: Beta

The Beta RR Racing 4T 390 is a competitive enduro machine engineered for serious off-road riders seeking reliability and performance. Its 385cc four-stroke engine features advanced dual electronic injection, titanium valves, and liquid cooling for consistent power delivery across demanding terrain. Built for racers and experienced trail enthusiasts, this bike excels in technical cross-country and enduro competitions.

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2026

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General information
Color Options	Red/blue/white
Category	Enduro / offroad
Year	2025
Model	Beta RR Racing 4T 390
Engine and Transmission Specifications
Starting	Electric
Emission	90.2 CO2 g/km. (CO2 - Carbon dioxide emission)
Fuel Consumption	3.89 litres/100 km (25.7 km/l or 60.47 mpg)
Clutch	Wet multi-disc
Final Drive	Chain (final drive)
Gearbox	6-speed
Cooling System	Liquid
Ignition	Kokusan
Fuel Control	Double Overhead Cams/Twin Cam (DOHC)
Induction	Injection. Synerject dual electronic injection
Valves Per Cylinder	4
Bore x Stroke	88.0 x 63.4 mm (3.5 x 2.5 inches)
Compression Ratio	12.5:1
Engine Details	Titanium valves
Engine Type	Single cylinder, four-stroke
Capacity:	385.6 ccm (23.53 cubic inches)

Physical measures and capacities
Fuel Capacity	9.00 litres (2.38 US gallons)
Wheelbase	1490 mm (58.7 inches)
Ground Clearance	320 mm (12.6 inches)
Overall Width	815 mm (32.1 inches)
Overall Length	2180 mm (85.8 inches)
Overall Height	1270 mm (50.0 inches)
Seat Height	950 mm (37.4 inches) If adjustable, lowest setting.
Dry Weight	107.5 kg (237.0 pounds)
Beta RR Racing 4T 390 dimensions and frame
Rear Brakes	Single disc. 1-piston floating caliper
Brake Disc Diameter	240 mm (9.4 inches)
Front Brakes	Single disc. 2-piston floating calipers
Rear Tyre	140/80-18
Front Tyre	90/90-21
Rear Wheel Travel	290 mm (11.4 inches)
Rear Suspension	KYB monoshock with progressive compound lever
Front Wheel Travel	295 mm (11.6 inches)
Front Suspension	KYB hydraulic USD fork with 48mm shaft
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
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.
Comments	Traction control.
Oil capacity	1.60 litres (1.69 US quarts)
Reserve fuel capacity	2.30 litres (0.61 US gallons)
Lubrication system	2 oil pumps

Performance Profile & Rider Fit

Best For

Track20%

City25%

Cornering70%

Daily Riding20%

Touring20%

Passenger5%

Rider Profile

Best For	This is a competition-focused enduro machine best suited to riders with genuine off-road skill and experience, not newcomers to dirt riding.
Purpose	Built purely for serious enduro racing and technical trail riding, with no concession to street comfort or long-distance touring.
Rider Fit	Its extremely light dry weight and tall 950mm seat height demand an agile, fit rider comfortable standing on pegs and manhandling the bike over rough terrain.
Character	A razor-sharp, high-revving single-cylinder enduro weapon with premium KYB suspension and titanium valves, designed to attack trails and technical sections with minimal weight and maximum control.
Not Ideal For	This bike is not for riders seeking a comfortable commuter, a passenger-friendly ride, or a relaxed long-distance tourer.

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

Rider Fit Visualizer

2026 Beta RR Racing 4T 390 Rider Ergonomics Assessment

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Feet:

At 950mm, a rider of 175cm with a 79cm (estimated) inseam will reach the ground with cannot reach comfortably on the 2026 Beta RR Racing 4T 390, 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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