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Beta RR 4T 390 2021 Powerful Dirt Bike Review Specs

The new Beta RR 4T 390 2021 Powerful Dirt Bike has exceptional traction and handling-to-power ratio.

Beta RR 4T 390 2021 Powerful Dirt Bike

Beta RR 4T 390 2021 Powerful Dirt Bike – Features and Specs

Engine and Transmission

The engine of Beta RR 4T 390 2021 Powerful Dirt Bike comes with the displacement of 385.4 ccm, four-stroke, and single-cylinder that maintains compression power ratios of 12, 5, and 1. Double overhead or twin cams regulate the fuel system and have a carburetor with Synerject dual electronic injection (DOHC)—Built-in Kokusan-type DC-CDI ignition system with variable ignition timings.

Also Read: Beta 2021 RR 4T 430 Dirt Bike Review

Engine efficiency is increased using a liquid cooling system, which operates two oil pumps to lubricate the engine. The ride is echo-free and smooth thanks to a chain transmission system and a 6-speed gearbox. The wet multi-disc clutch on a dirt bike allows the rider to unwind while enjoying a smooth ride.

Beta RR 4T 390 2021 Powerful Dirt Bike

Chassis, Suspension, Brakes, and Wheels

The Beta RR 4T 390 2021 Powerful Dirt Bike’s steel twin cradle frame has a hydraulic fork and a ø48mm front suspension shaft. Mono shocks provide a smoother, more pleasurable ride with progressive compound levers and compression and rebound settings for the effective rear suspension. The motorcyclist can stop fast because of the single-disc brakes in the front and the back.

Physical Measures and Capacities

The bike’s total height of 1270 mm makes it ideal for everyone. The rider’s preferred seat height can be adjusted on the Beta RR 4T 390 2021 Powerful Dirt Bike. The wheelbase is 1490 mm. As a result, a rider is free to operate a vehicle with a massive gasoline capacity of up to 9.00 liters on the roadways.

Beta RR 4T 390 2021 Powerful Dirt Bike

Beta RR 4T 390 2021 Powerful Dirt Bike – Technical Specifications

Engine and transmission

Displacement 385.4 ccm (23.52 cubic inches)
Engine type Single-cylinder, four-stroke
Compression 12.5:1
Bore x stroke 88.0 x 63.4 mm (3.5 x 2.5 inches)
Fuel system Carburettor. Synerject dual electronic injection
Fuel control Double Overhead Cams/Twin Cam (DOHC)
Ignition DC-CDI without trembler with variable ignition timing, Kokusan type.
Lubrication system Two oil pumps
Cooling system Liquid
Gearbox 6-speed
Transmission type Chain (final drive)
Clutch Wet multi-disc

Chassis, suspension, brakes, and wheels

Frame type Molybdenum steel with a double cradle split above the exhaust port
Front Suspension Hydraulic USD fork with ø48mm shaft
Front-wheel travel 295 mm (11.6 inches)
Rear Suspension Monoshock with progressive compound lever
Rear wheel travel 290 mm (11.4 inches)
Front tire 90/90-21
Rear tire 140/80-18
Front brakes Single disc
Diameter 260 mm (10.2 inches)
Rear brakes Single disc
Diameter 240 mm (9.4 inches)

Beta RR 4T 390 2021 Powerful Dirt Bike

Physical measures and capacities

Dry weight 107.5 kg (237.0 pounds)
Seat height 940 mm (37.0 inches). If adjustable, lowest setting.
Overall height 1270 mm (50.0 inches)
Overall length 2180 mm (85.8 inches)
Overall width 815 mm (32.1 inches)
Ground clearance 320 mm (12.6 inches)
Wheelbase 1490 mm (58.7 inches)
Fuel capacity 9.00 liters (2.38 US gallons)
Reserve fuel capacity 3.89 liters (1.03 US gallons)

Other specifications

Color options Red/white/Black
Starter Electric


The red, white, and black versions of the Beta RR 4T 390 2021 Powerful Dirt Bike are available. It has a built-in electric starter. The bike weighs 107.5 kg and is not heavily loaded. A single-cylinder, four-stroke engine and multi-disc clutch are supposed to provide a more comfortable ride off-road, though. Steel double cradle frames with adjustable suspension make up a strong chassis.

The bike’s wheels provide good traction on the ground and feature a 320 mm ground clearance. Also, a smoother, faster, and longer ride results from a strong fuel capacity and 3.89 liters of reserve gasoline. There are no restrictions when riding a 2021 Beta RR 4T 390 Powerful Dirt Bike, and the rider cannot stop admiring the bike.

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