| Attribute | Value |
| General |
| Production from | 2013 year |
| Make | Rieju |
| Model | Rieju Marathon 125 Pro Competizione |
| Category | Enduro / offroad |
| Engine and transmission |
| Engine type | Single cylinder, four-stroke |
| Valves per cylinder | 4 |
| Fuel system | Carburettor. Keihin CVEK 30 |
| Engine details | Yamaha engine |
| Displacement | 125 cm³ |
| Power | Add |
| Max RPM | Add |
| Fuel consumption | Add |
| Cooling system | Liquid |
| Transmission type,final drive | Chain |
| Torque | Add |
| Bore | 52 mm |
| Stroke | 58.6 mm |
| Gearbox | 6-speed |
| Greenhouse gases | Add |
| Fuel control | Add |
| Emission details | Add |
| Driveline | Add |
| Ignition | Race spec CDI with selectable power mapping |
| Clutch | Wet mulitidisks |
| Lubrication system | Wet sump |
| Compression | Add |
| Exhaust system | Leovinci |
| Chassis |
| Front suspension | Marzocchi inverted fork of Ø40mm, adjustable. |
| Rear suspension | Gas Mono-shock shock absorber and seaprate bottle PRS system, adjustable. |
| Front brakes | Single disc. Galfer Wave. Double piston caliper. |
| Rear brakes | Single disc. Galfer Wave |
| Diameter | 200 mm |
| Frame type | Double cradle. Highly resistant steel perimeter |
| Front tyre | 90/90-21 |
| Rear tyre | 120/80-18 |
| Seat | Add |
| Wheels | Competition FIM3 |
| Front wheel travel | Add |
| Rear wheel travel | Add |
| Trail | Add |
| Rake (fork angle) | Add |
| Other |
| Battery capacity | Add |
| Starter | Electric |
| Color options | |
| Carrying capacity | Add |
| Light | Add |
| Instruments | Digital |
| Electrical Voltage | Add |
| Dimensions |
| Wheelbase | 1,405 mm |
| Kerb weight | Add |
| Dry weight | 115 kg |
| Power/weight ratio | Add |
| Overall height | 1,165 mm |
| Overall length | 2,150 mm |
| Overall width | Add |
| Seat height | 870 mm |
| Alternate seat height | Add |
| Ground clearance | Add |
| Front percentage of weight | Add |
| Rear percentage of weight | Add |
| Performance |
| Top speed | Add |
| Acceleration 0-100 km/h | Add |
| Length | Add |
| Reserve fuel capacity | Add |
| Fuel capacity | 6.3 l |
| Oil capacity | Add |
| Width | Add |
| Height | Add |