Aprilia RS 50 Extrema (1993-2003): The Pocket Rocket That Defined a Generation

Introduction

The Aprilia RS 50 Extrema isn’t just a motorcycle—it’s a rite of passage. For riders who came of age in the 1990s and early 2000s, this 50cc two-stroke sport bike was often their first taste of motorcycling’s adrenaline rush. Designed to mimic the aggressive styling of its larger RS siblings, the RS 50 Extrema blended Italian flair with accessible performance, making it a cult classic in the lightweight sport segment. Even today, its legacy endures as a gateway machine for aspiring riders and a nostalgic gem for collectors. Let’s dive into what makes this pint-sized legend so unforgettable.

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Design: Big Bike Attitude in a Compact Package

The RS 50 Extrema’s design screams “race replica” from every angle. With its sharp, angular fairings, twin-headlight setup, and a raked-forward stance, it’s easy to mistake this bike for a full-sized supersport machine. Aprilia didn’t cut corners here: the RS 50 borrowed styling cues directly from its RS 125 and RS 250 siblings, complete with a aerodynamic tail section and clip-on handlebars.

Ergonomics: At 810 mm (31.9 inches), the seat height is approachable for shorter riders, but the riding position is pure sport bike—lean forward, knees tucked, and eyes on the horizon. The narrow 640 mm (25.2-inch) width keeps the bike flickable, while the 89–90.5 kg (196–200 lb) dry weight feels almost featherlight.

Chassis and Suspension: The Extrema’s steel frame pairs with a 30 mm stanchion front fork holding 180 ml of 20W oil—a surprisingly robust setup for a 50cc bike. Rear suspension offers 110 mm (4.3 inches) of travel, balancing comfort and responsiveness on bumpy backroads.

Brakes and Wheels: Single 220 mm discs front and rear deliver ample stopping power for a bike this light. The 17-inch wheels wrapped in 90/80 (front) and 110/80 (rear) tires provide stable cornering, though aggressive riders might upgrade to stickier rubber.

Color options like Black/Red emphasized its racing pedigree, ensuring the RS 50 looked as fast parked as it did at full tilt.

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Performance: The Thrill of Ringing Out a Two-Stroke

Let’s be clear: the RS 50 Extrema isn’t about raw speed. With a 49.7cc liquid-cooled two-stroke engine producing 3 PS (2.2 kW), its top speed hovers around 90 km/h (56 mph)—if you’re brave enough to hold the throttle wide-open. But what it lacks in power, it makes up for in character.

The Two-Stroke Experience: This engine is a symphony of noise and fury. The carbureted single-cylinder comes alive above 6,000 RPM, screaming with that signature two-stroke buzz. Keeping it “on the pipe” requires mastering the 6-speed gearbox, which is unusually sophisticated for a 50cc bike. Shifts are crisp, and the close ratios let you chase the powerband like a mini-GP rider.

Handling: With a 1,280 mm (50.4-inch) wheelbase and near-perfect weight distribution, the RS 50 carves corners with telepathic agility. It’s a bike that rewards precision—flick it into a bend, scrape a knee (or at least feel like you could), and fire out the other side.

Liquid Cooling: Rare in its class, the liquid-cooling system (900 ml capacity) keeps temps stable during spirited rides, a perk over air-cooled rivals.

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Competition: How the RS 50 Stacks Up

The lightweight sport segment in the 1990s was fiercely competitive. Here’s how the RS 50 Extrema held its ground:

1. Derbi GPR 50

• Engine: 50cc two-stroke, air-cooled
• Weight: 95 kg (209 lbs)
• Pros: Slightly more tuning potential, racier aesthetics.
• Cons: Heavier, less refined suspension.

Verdict: The Derbi matches the Aprilia’s aggression but lacks its polished chassis.

2. Yamaha TZR 50

• Engine: 50cc two-stroke, liquid-cooled
• Weight: 92 kg (203 lbs)
• Pros: Yamaha reliability, similar power delivery.
• Cons: Softer suspension, dated styling.

Verdict: The TZR is a dependable choice but doesn’t stir the soul like the Aprilia.

3. Honda NSR 50

• Engine: 50cc two-stroke, air-cooled
• Weight: 88 kg (194 lbs)
• Pros: Honda build quality, lightweight.
• Cons: Less peaky powerband, basic brakes.

Verdict: The NSR is a great learner bike but lacks the RS 50’s track-ready edge.

Aprilia’s Advantage: The RS 50 Extrema struck a rare balance between style, handling, and that intoxicating two-stroke punch. Its liquid cooling and premium suspension gave it a technical edge, while its design appealed to riders dreaming of MotoGP glory.

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Maintenance: Keeping Your RS 50 Extrema Alive

Owning a two-stroke requires dedication, but the RS 50 rewards those who treat it right. Here’s your survival guide:

1. Engine Care

• Oil: Use synthetic two-stroke oil (Aprilia recommends XTS or TTS). Mix ratios matter—stick to 2% for street riding.
• Spark Plugs: NGK B8ES (standard) or BR8EIX (iridium) at 0.5 mm gap. Carry spares; two-strokes foul plugs if ridden gently.
• Coolant: Replace every 2 years with ethylene glycol-based fluid (900 ml capacity).

2. Transmission

• Gearbox Oil: 750 ml of SAE 10W-40 every 3,000 km (1,864 miles).

3. Chain and Sprockets

• The 11/43 tooth combo wears quickly if neglected. Clean and lube every 500 km (310 miles). Upgrade to an O-ring chain for longevity.

4. Brakes

• Fluid: DOT 4, changed annually. Watch for sponginess—air in the lines is common.

5. Tires

• Pressures: 2.0 bar (29 psi) front, 2.1 bar (30.5 psi) rear. Stick to 17-inch sport tires for optimal grip.

Pro Tip: The kickstarter demands technique. Prime the engine with a few gentle strokes before a full-force kick.

At MOTOPARTS.store, we stock everything from NGK spark plugs to OEM-style chains and sprocket kits, ensuring your RS 50 stays in fighting shape.

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Conclusion: Why the RS 50 Extrema Still Matters

The Aprilia RS 50 Extrema is more than a starter bike—it’s a masterclass in accessible excitement. Its razor-sharp handling, addictive two-stroke engine, and timeless design make it a joy to ride, even decades later. While modern 125cc four-strokes have eclipsed it in practicality, none replicate the raw, unfiltered thrill of wringing out this Italian pocket rocket.

Whether you’re reliving your youth or discovering two-stroke magic for the first time, the RS 50 Extrema deserves a spot in your garage. And when it’s time for upgrades or repairs, MOTOPARTS.store has the parts to keep your Aprilia screaming for another 20 years.

Ciao, ragazzi! Keep the revs high.

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Specifications sheet

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