APRILIA
2018 - 2023 APRILIA RX 125

RX 125 (2018 - 2023)

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Aprilia RX 125 (2018–2023) Review: The Euro 5 Enduro for Trailblazers

Introduction

The Aprilia RX 125 isn’t just a motorcycle—it’s a gateway to off-road mastery. Designed for riders aged 16–18 (or young-at-heart adventurers) in markets with A1 license restrictions, this Italian enduro bridges the gap between entry-level trail bikes and serious off-road machines. From 2018 to 2023, the RX 125 evolved subtly but decisively, adopting Euro 5 compliance without sacrificing its gritty character. With a liquid-cooled 125cc engine, upside-down forks, and knobby tires ready to claw through mud, this bike promises to turn fire roads into playgrounds. Let’s dissect why it’s a standout in the 125cc enduro segment.


Design & Styling: Rally DNA Meets Modern Pragmatism


Aprilia’s off-road heritage screams from every angle of the RX 125. Early models (2018–2020) leaned into a minimalist aesthetic with a steel perimeter frame and bold “Red Raceway” graphics. By 2021, the Rally Tribute scheme debuted—a nod to Aprilia’s Dakar roots with retro-styled decals and a silver/black palette that hides trail scratches beautifully.

The 2023 refresh sharpened details: the twin-tube steel frame gained rigidity, while the anodized black spoked wheels (21" front, 18" rear) looked race-ready straight from the showroom. At 905 mm (35.6"), the seat height is intimidating for shorter riders but perfect for standing attacks on technical terrain. Underneath, a hidden USB port compartment (a clever accessory) hints at Aprilia’s understanding of tech-savvy adventurers.


Engine & Performance: Small Bore, Big Ambitions


Don’t let the 124.2cc displacement fool you—this DOHC four-stroke is a coiled spring. Euro 4 models (2018–2020) delivered 15 HP at 10,500 RPM, but Euro 5 updates (2021–2023) retuned the Magneti Marelli ECU to squeeze torque lower in the rev range: 10.9 Nm (8.0 lb-ft) at 8,000 RPM. Translation? Less frantic shifting in rocky climbs.

The liquid cooling system is the unsung hero. Even after hours of slow-speed trail crawling, temps stay stable—a stark contrast to air-cooled competitors that wilt under abuse. Fuel efficiency borders on witchcraft: 2.6 L/100 km (90.5 MPG) means 270 km (168 miles) from the 7L tank. But let’s be real—you’ll refuel just to keep riding.


Chassis & Handling: Precision in the Peanuts


Weighing 134 kg (295 lbs) wet, the RX 125 feels like a mountain bike with a motor. The 41mm USD forks (240mm travel) and linkage-mounted monoshock (210–220mm rear travel) are overkill for a 125—and that’s a compliment. Over roots and ruts, the suspension remains composed, refusing to bottom out even when landing small jumps.

ABS on the front 260mm wave disc (a Euro 5 addition) is divisive. Purists will grumble, but for wet clay or unexpected pavement, the Bosch system is a lifesaver. Switch it off? Aprilia doesn’t make it easy—a nod to EU safety regulations.


Off-Road Capability: Where the RX 125 Earns Its Wings


The RX 125’s party trick is transforming tight singletrack into a rhythm section. The 21" front wheel rolls over logs effortlessly, while the 120/80-18 rear Pirelli Scorpion XC knobs dig into loose soil. At 905mm (35.6"), the seat height gives a commanding view, though shorter riders might tip-toe at stops.

Wheel travel is generous for the class: 240mm front, 220mm rear. Combined with a 1350–1430mm (53–56") wheelbase (lengthened post-2020 for stability), it balances agility and high-speed composure. Just don’t expect desert-racer speeds—the 15 HP engine taps out around 110 km/h (68 mph).


Competition: How the Aprilia Stacks Up


Yamaha WR125R: The RX’s arch-nemesis. Yamaha’s 15 HP engine is similarly peppy, but its air-cooled design overheats in slow trails. No ABS, either.

KTM 125 EXC: Lighter (122 kg) and slightly more powerful (15.5 HP), but costs 20% more. KTM’s suspension is plusher, but the RX counters with a sturdier steel frame.

Honda CRF125F: Budget-friendly but stuck in the past. Drum brakes, no liquid cooling, and a 5-speed gearbox make it feel agricultural next to the Aprilia.

Verdict: The RX 125 wins on tech (liquid cooling, ABS) and value. It’s the thinking rider’s 125cc enduro.


Maintenance: Keeping the Italian Stallion Alive


The RX 125 is low-maintenance by design, but smart upgrades extend its lifespan:

  • Oil Changes: Every 3,000 km (1,865 miles) with 10W-40 synthetic. MOTOPARTS.store’s ProRide Synthetic Kit includes a OEM-spec filter.
  • Chain Care: The DID 520 chain stretches quickly. Upgrade to a DID 520VX2 for longer life.
  • Brake Fluid: Bosch ABS demands fresh DOT 4 yearly.
  • Coolant: Replace every 2 years with Engine Ice for better heat dissipation.
  • Air Filter: Foam filters clog fast in dust. The DNA Stage 1 Filter boosts airflow and is washable.

Common Issues:
- Stator Failures: 2018–2019 models had weak stators. Check for charging issues.
- Clutch Slippage: The multi-plate clutch hates abuse. MOTOPARTS’ EBC Heavy-Duty Plates add bite.


Conclusion: The 125cc Dark Horse


The Aprilia RX 125 is a masterclass in doing more with less. It’s not the fastest or lightest, but as a training tool for future 450cc champions or a guilt-free trail companion, it’s peerless. Post-2020 updates (ABS, Euro 5) polished its rough edges without dulling its spirit.

Would we buy one? If tight trails and technical climbs are your jam—absolutely. Just budget for a taller gear lever (size 12 boots will thank you) and a skid plate. At MOTOPARTS.store, we’ve got both.

Now, go get dirty.




Specifications sheet

Engine
Stroke: Four-stroke
Max power: 11 kW | 15.0 hp
Max torque: 11 Nm
Fuel system: Fuel Injection (Magneti Marelli MIUG4 ø 32 mm ECU)
Max power @: 10000 rpm
Displacement: 124 ccm
Fuel control: DOHC
Max torque @: 8000 rpm
Bore x stroke: 58.0 x 47.0 mm (2.3 x 1.9 in)
Configuration: Single
Cooling system: Liquid
Compression ratio: 12.6:1
Emission standard: Euro 5
Lubrication system: Wet sump
Number of cylinders: 1
Dimensions
Wheelbase: 1425 mm (56.1 in)
Dry weight: 124
Wet weight: 134
Seat height: 905 mm (35.6 in)
Overall width: 820 mm (32.3 in)
Overall height: 1180 mm (46.5 in)
Overall length: 2075 mm (81.7 in)
Ground clearance: 220 mm (8.7 in)
Fuel tank capacity: 7.0 L (1.85 US gal)
Drivetrain
Final drive: chain
Transmission: 6-speed
Rear sprocket: 40
Front sprocket: 17
Final drive ratio: 17/40 (2.35)
Primary drive ratio: 63/19 (3.31)
Maintenance
Coolant: Water-based (WASSER+)
Engine oil: 10W-40 (synthetic recommended)
Brake fluid: DOT 4
Spark plugs: NGK CR8E or NGK CR8EIX
Valve clearance (intake, cold): 0.10–0.20 mm
Valve clearance check interval: 24,000 km / 15,000 mi
Valve clearance (exhaust, cold): 0.20–0.30 mm
Additional Features
ABS: Front wheel only (Bosch ABS with anti roll-over mode)
Color options: Red Raceway, Silver Speedway, Rally Tribute (varies by year)
Instrumentation: Digital display with trip odometer and USB port compatibility
Chassis and Suspension
Frame: Twin-tube steel frame
Wheels: Aluminium spoked (Front: 1.85 x 21, Rear: 2.15 x 18)
Rear tire: 120/80-18
Front tire: 90/90-21
Rear brakes: Single 220 mm disc, floating caliper
Front brakes: Single 260 mm disc, floating caliper (ABS on front wheel)
Rear suspension: Steel swingarm, monoshock with progressive link system
Front suspension: Ø 41 mm telescopic upside down fork
Rear wheel travel: 210 mm (8.3 in)
Front wheel travel: 240 mm (9.4 in)






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