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.

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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.

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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.

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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.

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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).

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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.

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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.

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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.

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Specifications sheet

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