| MODEL | RIEJU RR CASTROL 2005 |
| Year | 2005 |
| Engine Type | Single cylinder, two-stroke |
| Displacement / Capacity | 50 cc / 3.05 cu in |
| Bore X Stroke | 39 x 40.3 mm / 1.5 x 1.6 in |
| Compression Ratio | 12.0:1 |
| Cooling System | Liquid |
| Max Power | 6.9 kW / 9.5 hp |
| Max Torque | — |
| Ignition | — |
| Induction | Carburettor, Dell'Orto SHAH |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | Multiple discs in oil bath |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Double-cradle steel tube, electrically welded, reinforced at the front |
| Front Suspension | Showa inverted fork |
| Rear Suspension | Showa, adjustable |
| Front Brakes | Single disc, 260 mm / 10.2 in, double-piston |
| Rear Brakes | Single disc, 180 mm / 7.1 in |
| DIMENSION SPECS | |
| Overall Length | 2050 mm / 80.7 in |
| Overall Width | 800 mm / 31.5 in |
| Overall Height | 1170 mm / 46.1 in |
| Seat Height | — |
| Wheelbase | 1332 mm / 52.4 in |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 80/90-21 |
| Rear Tyre | 110/80-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 6 Litres / 1.59 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The RR Castrol is a sponsor-livery supermoto 50 from 2005, a higher-spec RR with a 260 mm front disc, a reinforced frame front and a competition-style exhaust. Its engine claims slightly more output than the RR 2000.
