22 June. Monday 2026
RR X Pro 4T 390 - 2026 Specifications and Reviews
The Beta RR X-Pro 4T 390 is a lightweight enduro machine designed for serious off-road riders seeking technical trail performance. Its 385cc four-stroke engine delivers responsive power with advanced fuel injection and liquid cooling, while titanium valves and dual overhead cams ensure durability. Best suited for competitive enduro enthusiasts and adventure riders tackling challenging terrain.
2026
General information | |
| Color Options | Red/blue/white |
| Price | US$ 10399. MSRP depends on country, taxes, accessories, etc. |
| Category | Enduro / offroad |
| Model | Beta RR X-Pro 4T 390 |
Engine and Transmission Specifications | |
| Starting | Electric |
| Emission | 76.6 CO2 g/km. (CO2 - Carbon dioxide emission) |
| Fuel Consumption | 3.30 litres/100 km (30.3 km/l or 71.28 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 |
| 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 | 315 mm (12.4 inches) |
| Overall Width | 830 mm (32.7 inches) |
| Overall Length | 2180 mm (85.8 inches) |
| Overall Height | 1270 mm (50.0 inches) |
| Seat Height | 940 mm (37.0 inches) If adjustable, lowest setting. |
| Dry Weight | 107.5 kg (237.0 pounds) |
RR X Pro 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 |
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Other specs | |
| Related bikes | List related bikes for comparison of specs. |
| Ask questions | Join the 25 Beta RR X-Pro 4T 390 discussion group or the general Beta discussion group. |
| Maintenance | Find parts, fluids. filters, maintenance tools and service manuals at Amazon.com. |
| Insurance costs | Compare US insurance quotes from the nation's top providers. |
| 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 |
| Engine type | Single cylinder, four-stroke |
| Year | 2025 |
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