| MODEL | RIEJU MARATHON 125 PRO 2023 |
| Year | 2023 |
| Engine Type | Single-cylinder, four-stroke, 4 valves per cylinder, liquid cooled (Minarelli engine) |
| Displacement / Capacity | 125 cc / 7.6 cu in |
| Bore X Stroke | 52 x 58.6 mm / 2 x 2.3 in |
| Compression Ratio | — |
| Cooling System | Liquid |
| Max Power | 10.9 kW / 15 hp |
| Max Torque | — |
| Ignition | — |
| Induction | Injection |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Double cradle steel perimeter with detachable rear sub-chassis |
| Front Suspension | 40 mm inverted fork (R16V) |
| Rear Suspension | Gas mono-shock with separate bottle, PRS system |
| Front Brakes | Single 300 mm / 11.8 in Galfer wave disc, double-piston caliper |
| Rear Brakes | Single 200 mm / 7.9 in Galfer wave disc |
| DIMENSION SPECS | |
| Overall Length | 2070 mm / 81.5 in |
| Overall Width | 800 mm / 31.5 in |
| Overall Height | 1165 mm / 45.9 in |
| Seat Height | 890 mm / 35 in |
| Wheelbase | 1405 mm / 55.3 in |
| Ground Clearance | — |
| Dry Weight | 121 kg / 266.8 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 90/90-21 |
| Rear Tyre | 120/90-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 6.32 Litres / 1.67 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The Marathon 125 Pro is Rieju's learner-legal 125 cc four-stroke enduro, built around a liquid-cooled 15 hp single with a six-speed box. It pairs a steel perimeter frame with an inverted fork and a remote-reservoir rear shock, aimed at new riders who want real off-road hardware. The 2023 model switched to fuel injection.
