| MODEL | RIEJU 50 SPIKE RACING CASTROL PRO 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 | Dell'Orto HSA carburettor |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | Separate with automatic mixer |
| Gear Box | 6-speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Perimetral double-beam |
| Front Suspension | Showa Advantage, inverted |
| Rear Suspension | Showa, adjustable |
| Front Brakes | Single disc, two-piston caliper, 260 mm / 10.2 in |
| Rear Brakes | Single disc, 200 mm / 7.9 in |
| DIMENSION SPECS | |
| Overall Length | 2050 mm / 80.7 in |
| Overall Width | 800 mm / 31.5 in |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1332 mm / 52.4 in |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 100/80-17 |
| Rear Tyre | 130/70-17 |
| FUEL SYSTEM | |
| Fuel Capacity | — |
| Fuel Consumption | — |
| Top Speed | — |
A Castrol-branded, higher-spec 50 cc supermotard with Showa suspension and larger brakes than the plain Spike. It was a race-replica style learner machine with a six-speed gearbox.
