| MODEL | RIEJU MR 300 PRO 2021 |
| Year | 2021 |
| Engine Type | Single cylinder, two-stroke |
| Displacement / Capacity | 299.3 cc / 18.26 cu in |
| Bore X Stroke | 72.0 x 72.0 mm |
| Compression Ratio | — |
| Cooling System | Liquid |
| Max Power | 22 kW / 29.9 hp |
| Max Torque | — |
| Ignition | CDI |
| Induction | Carburettor |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed manual |
| Clutch | Multidisc in oil bath, Magura hydraulic clutch pump |
| Final Drive | — |
| CHASSIS SPECS | |
| Frame | Chromium-molybdenum steel central spine |
| Front Suspension | KYB 48 mm fork, AOS system, DLC treatment, 300 mm travel |
| Rear Suspension | KYB mono-shock, 131 mm travel |
| Front Brakes | Single 260 mm disc |
| Rear Brakes | Single disc |
| DIMENSION SPECS | |
| Overall Length | 2145 mm / 84.4 in |
| Overall Width | 810 mm / 31.9 in |
| Overall Height | 1235 mm / 48.6 in |
| Seat Height | 960 mm / 37.8 in |
| Wheelbase | 1480 mm / 58.3 in |
| Ground Clearance | — |
| Dry Weight | 105 kg / 231.5 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 90/90-21 |
| Rear Tyre | 140/80-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 8.9 Litres / 2.35 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The MR 300 Pro is Rieju's flagship two-stroke hard enduro machine, a 300 cc liquid-cooled single with electric start and a choice of rain or dry engine maps. This first-year 2021 version has a 960 mm seat and a smaller 8.9 litre tank than later years.
