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2021 APRILIA RX 125

Aprilia has today revealed details of its latest 125cc trailie – the RX 125

Hot on the heels of Beta’s new 125cc four-stroke trailie, the RR 125 LC, fellow Italian company Aprilia have today revealed news of their latest update of their long-running RX 125. Those with long memories will remember when the RX used to be a two-stroke, but these days it features a sophisticated four-stroke motor designed to meet the EU’s directives on emissions and power output to meet rider licencing.

Here’s what’s new:


A lot of focus has placed on attention to the trim, says Aprilia, the frame, as well as the engine, the swingarm, the wheels and the double-section aluminium handlebar are painted an attractive glossy black, whereas the fuel tank profile is new. The Rally Tribute colour scheme is also new, characterised by typical colours from Aprilia’s off-road heritage. There is a compartment under the seat where the USB port can be mounted (one of the available accessories).

Confirming their commitment to building advanced motorcycles that are versatile and practical in everyday use, Aprilia has equipped the SX and RX with sophisticated, compact, modern and easy to read digital instruments; as well as offering more common functions. Its new features also boast the travel diary with the possibility of viewing top speed and two trip odometers showing the miles travelled during riding sessions.

Aprilia RX 125 is available in the Silver Speedway colour scheme and the new Rally Tribute graphic variation.

Aprilia RX 125 – Silver Speedway colours
Aprilia RX 125 – Rally Tribute colours


The new engine is a 15hp liquid-cooled DOHC four valve single-cylinder four-stroke, entirely revamped in the thermodynamics area, with a new head for the redesigned combustion chamber, new intake and exhaust ducts and a new iridium spark plug. The camshafts have been reshaped with more aggressive valve control, while the valves feature bucket tappets. The entire intake line has been redesigned and now has a brand new air filter. The throttle body is now located in a higher position in order to make the intake air flow to the head more direct. The exhaust line was similarly redesigned and has a new exhaust system featuring a new and more efficient catalysis system, as well as a new steel silencer. Aprilia say the torque curve is now even more robust and maximum power is developed at lower revs which, among other things, allows for lower fuel consumption, thanks in part to the refined electronic management by the new Marelli MIUG4 ECU. On the road, this translates into more responsive performance when the throttle is twisted, providing more fun in sport and easier handling in city commutes and off-road riding alike.


Aprilia say the RX boasts advanced suspension and a class-beating brake system with ABS, offering ‘extraordinary, perfectly controllable stopping power’greater safety and better efficiency. Aprilia is the first to introduce the Bosch ABS system with anti roll-over mode in this market segment, which acts on the front wheel, on one hand guaranteeing precision and total control in braking and, on the other, regulating rear-wheel lift in the hardest brakingThe RX is fitted with a 260mm front disc and 220 mm rear (both wave type).

The twin-tube steel frame is combined with 41 mm USD forks with 240mm wheel travel. At the rear, the long swingarm features a monoshock featuring progressive linkage and offering 210mm of wheel travel.

Aprilia SX 125 and RX 125 – Technical Data Sheet 

Engine type 

Single-cylinder, 4-stroke, 4-valve, DOHC, liquid cooling 

Bore and stroke 

58 x 47 mm 

Total engine capacity 

124.2 cc 

Compression ratio 

12.0~12.6 : 1 

Max Power 

11 kW at 10,000 rpm 

Maximum torque at crankshaft 

11.2 Nm at 8,000 rpm 


ECU Electronics Magneti Marelli MIUG4 ø 32 mm 




Wet sump 


6 speed, drive ratio: 

1st 11/33 

2nd 15/30 

3rd 18/27 

4th 20/24 

5th 25/27 

6th 23/22 


Multi plate wet clutch 

Primary drive 

Straight cut gears, drive ratio: 29/69 

Final drive 

Chain, drive ratio: 

SX: 13/62 

RX: 13/69 


Twin-tube steel frame 

Front suspension 

Upside down fork with Ø 41 mm stanchions, 240 mm excursion 

Rear suspension 

Steel swingarm, monoshock with progressive link system, wheel travel 210 mm 



Front: Ø 300 mm stainless steel disc with floating calliper 

Rear: Ø 220 mm stainless steel disc with floating calliper 


Front: Ø 260 mm disc with floating calliper 

Rear: Ø 220 mm disc with floating calliper 

Metal-braided connecting hoses. 


SX: Front: 2.5 X 17″ rear: 3.5 X 17” 

RX : Front: 1.85 X 21″ rear: 2.15 X 18” 


SX: Front: 100/80 – 17” rear 130/70 -17” 

RX : Front: 90/90 – 21” rear 120/80 -18” 


Max. length: 2075 mm (RX 2145 mm) 

Max. width: 820 mm 

Wheelbase: 1425 mm (1430 mm) 

Max. height: 1140 mm (RX 1180 mm) 

Saddle height: 880 mm (RX 905 mm) 


134 Kg (kerb weight with full fuel tank) 

Consumption (WMTC cycle) 

2.6 l/100 km 

CO2 Emissions (WMTC cycle) 

60 g/km 

Fuel tank capacity 

7 litres 



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