Rosso Fluo was the fluorescent-red colour option for the RS 125, giving the small two-stroke a loud, race-paddock look.
| MODEL | APRILIA RS 125 ROSSO FLUO 2008 |
| Year | 2008 |
| Engine Type | Single cylinder, two-stroke, reed valve induction |
| Displacement / Capacity | 124.8 cc / 7.5 cu in |
| Bore X Stroke | 54 x 54.5 mm |
| Compression Ratio | 12.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 21 kW / 28 hp @ 10500 rpm |
| Max Torque | 19 Nm @ 9000 rpm |
| Ignition | CDI |
| Induction | Dell'Orto PHBH 28 carburettor |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Separate mixing, volumetric pump |
| Gear Box | 6 Speed |
| Clutch | Wet, multi-disc |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Cast aluminium twin-spar frame |
| Front Suspension | 40 mm upside-down fork, 120 mm travel |
| Rear Suspension | Monoshock, cast aluminium box-section swingarm, 120 mm travel |
| Front Brakes | Single 320 mm disc, radial 4-piston caliper |
| Rear Brakes | Single 220 mm disc, 2-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 1955 mm |
| Overall Width | 720 mm |
| Overall Height | 1100 mm |
| Seat Height | 805 mm |
| Wheelbase | 1345 mm |
| Ground Clearance | — |
| Dry Weight | 115 kg |
| Wet Weight | 142 kg |
| WHEEL SPECS | |
| Front Tyre | 110/70-17 |
| Rear Tyre | 150/60-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 14 Litres |
| Fuel Consumption | — |
| Top Speed | 155 km/h |
Rosso Fluo was the fluorescent-red colour option for the RS 125, giving the small two-stroke a loud, race-paddock look. Mechanically it is the regular RS 125 of the period with its aluminium twin-spar frame, upside-down fork and radial front brake. In the US it was sold only for closed-course use because of emissions rules, and testers found an engine that does little until around 10,000 rpm but rewards being ridden hard on track.
