Launched in April 2018 with the SX 125 supermoto, this RX 125 swapped the old two-stroke for a liquid-cooled, fuel-injected four-stroke single…
| MODEL | APRILIA RX 125 2018 - 2020 |
| Year | 2018 - 2020 |
| Engine Type | Single cylinder, four-stroke, DOHC, 4 valves, Euro 4 |
| Displacement / Capacity | 124 cc / 7.6 cu in |
| Bore X Stroke | 58 x 47 mm |
| Compression Ratio | 12.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 10.9 kW / 15 hp @ 10500 rpm |
| Max Torque | 10.9 Nm / 8.0 lb-ft @ 8250 rpm |
| Ignition | Electronic CDI |
| Induction | Fuel injection, Magneti Marelli M3G ECU, 32 mm |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Wet sump |
| Gear Box | 6-speed |
| Clutch | Multi-plate, oil bath |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Steel twin-spar frame |
| Front Suspension | 41 mm upside-down fork, 240 mm travel |
| Rear Suspension | Steel swingarm, hydraulic monoshock with progressive link, 220 mm travel |
| Front Brakes | Single 260 mm steel wave disc, Bosch ABS with rollover mitigation |
| Rear Brakes | Single 200 mm steel wave disc |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 905 mm / 35.6 in |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 136 kg / 300 lbs |
| WHEEL SPECS | |
| Front Tyre | 90/90-21 |
| Rear Tyre | 120/80-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 7.5 Litres / 2.0 US gal |
| Fuel Consumption | — |
| Top Speed | — |
Launched in April 2018 with the SX 125 supermoto, this RX 125 swapped the old two-stroke for a liquid-cooled, fuel-injected four-stroke single (derived from the Derbi-based GPR125 unit) to meet Euro 4. It sits on a steel twin-spar frame with a 41 mm upside-down fork, a linked monoshock and Bosch ABS with rollover mitigation, unusual for a 125 enduro at the time. Output is about 15 hp, trading the two-stroke's punch for cleaner running and easier ownership.
