RR X-PRO
4T 390 MY27

MY26
My27

The RR X-PRO 4T 390 is the perfect balance of handling and power. It combines the agility typical of smaller-displacement bikes with torque and power that rival those of its larger siblings, taking you literally anywhere.

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385,6 cc

Displacement

88 x 63,4 mm

Bore x stroke

950 mm

Seat height

107 kg

Dry weight

MAIN FEATURES

SUSPENSION

SHC
FRONT FORK

The SHC (Separate Hydraulic Chamber) front fork remains a cornerstone of the X-PRO chassis thanks to its asymmetrical design with separate function management – rubber band on the right fork leg and hydraulic on the left – which optimises performance and reduces weight by approximately 250 grams compared to a standard front fork.

For the 2027 model year, the suspension has been given a completely new setup, designed to further expand the bike’s range of use. Beta’s engineers focused on improving shock absorption, particularly in the initial phase of operation. The result is a new setting that is consistently precise and responsive, capable of maintaining optimal contact with the ground and increasing linearity of response. This evolution enhances riding comfort, catering to both the amateur seeking confidence and the pro rider tackling the toughest sections of Hard Enduro.

SUSPENSION

XPRO
Mono

In keeping with the character of the X-PRO, the monoshock has been specifically developed to work in perfect synergy with the SHC front forks, delivering optimal handling and consistently comfortable ride quality.

In MY27, the rear suspension has evolved thanks to the introduction of new aluminium components that help reduce the vehicle’s overall weight. From a hydraulic perspective, updates have focused on the brake to achieve greater separation between high- and low-speed flow, enhancing absorption capacity and responsiveness to adjustments. The real technical revolution lies in the external management system: this aspect is now adjusted via new adjustments that allow the rider to intervene directly on the track quickly and immediately, without requiring the use of any tools.

INTEGRATED ELECTRONIC MANAGEMENT

The handlebar protection has been given a new look and features a redesigned control panel that brings together the bike’s controls. In addition to the traditional two engine maps (Standard and Soft) and the tried-and-tested two-level Traction Control, new features include 5-level Launch Control for lightning-fast starts and Quick Shift, for changing gears without releasing the throttle.

FRONT RECOVERY BELT

To emphasise the Extreme character of the RR X-PRO, a new front recovery belt has been introduced, customised with Beta embroidery, which is extremely useful for getting out of the most difficult situations.

NISSIN FRONT BRAKE PUMP

The X-PRO MY27 models retain the motocross-derived front brake caliper. Small, lightweight and high-performance, it ensures incisive performance and powerful braking during the most aggressive, limit-pushing braking manoeuvres, whilst maintaining the traditional modularity and safety of the systems chosen by Beta’s engineers.

Trailtech instrumentation and details

The new Trailtech digital dashboard makes its debut: larger, more robust and easier to read, paired with a high-precision wheel sensor. The MY27 package adds new, softer anti-fatigue grips, a reinforced chain guide and an enlarged pinion guard.

TITANIUM VALVES

The update to the 4-stroke engine includes new titanium valves with a revised finish. A technical solution of the highest quality that further raises the engine’s standards of durability and reliability when running at high revs.

COOLANT EXPANSION TANK

The coolant expansion tank, with a capacity of approximately 200cc, allows for the recovery of water that may be expelled from the radiator as temperatures rise, particularly during slower, more technical riding, or during extreme enduro sections.

Silent blockS

The silent blocks help reduce vibrations transmitted to the rider, making the ride more comfortable and less tiring.

ELECTRICAL SYSTEM AND BATTERY

The 4-stroke models benefit from an improved voltage regulator that ensures a higher, more stable and efficient voltage for all on-board components. This update increases the charging capacity of the lightweight lithium battery, ensuring maximum operational continuity of the bike even during the longest sessions.

MECHANICAL CHAIN TENSIONER

The 4-stroke engine adopts a new mechanical chain tensioner with a newly calibrated spring, replacing the previous hydraulic system. This modification optimises friction and the smoothness of operation, contributing to greater engine fluidity and more effective starts in both hot and cold conditions.

GRAPHICS AND PERSONALITY

The distinctive identity of the RR X-PRO 4T 390 is defined by its unmistakable full-red livery with contrasting black graphics. A sporty, modern and contemporary style, designed to blend with the bike’s sleek lines and enhance freedom of movement on the seat. Aesthetics meet functionality in the new headlight mask created by Beta’s designers, which refreshes the front end by housing a robust, latest-generation LED headlight. As well as delivering a significantly more powerful beam, it reduces power consumption, thereby extending the battery’s service life.

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CHASSIS

Frame

Molybdenum steel with double cradle split above
the exhaust port

Wheelbase

1480 mm

Max length

2180 mm

Max width

830 mm

Max height

1270 mm

Seat height

930 mm

Ground clearance

315 mm

Footrest height

407 mm

Dry weight

107,5 kg (front 52,7 kg; rear 54,8 kg)

Fuel tank capacity

9,0 l

Reserve

2,3 l

Cooling system capacity

1,4 l

Front suspension

Hydraulic USD fork with ø 48 mm shaft

Rear suspension

Monoshock with progressive compound lever

Shock absorber stroke

132 mm

Front wheel travel

295 mm

Rear wheel travel

290 mm

Front brake

Wave disc ø260 mm and double-piston floating
caliper

Rear brake

Wave disc ø240 mm and single-piston floating
caliper

Front rim

21 x 1,6 – 36 holes

Rear rim

18 x 2,15 – 36 holes

Front tyre

90/90 – 21

Rear tyre

140/80 -18

ENGINE

Type

Single cylinder, 4-stroke, liquid-cooled

Bore

88 mm

Stroke

63,4 mm

Displacement

385,6 cc

Compression ratio

12,48:1

Valve train

DOHC finger follower / 4 titanium valve

Starter

Electric starter

ACG

Kokusan

Spark plug

NNGK LKAR 8A-9

Lubrication

2 oil pumps

Fuel system

Elldor dual electronic injection

Throttle body

Ø 42 mm – Synerject

Clutch

Wet multi-disc clutch

Primary drive

Z.28/76

Transmission

6 gears

Final transmission

Chain

Engine oil

SAE 10W/50 0,8 l. + SAE 10W/40 0,8 l.

Consumption l/100 km

3,3

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