Aprilia SX 50 SM 2T (2019-2021): A Pocket-Sized Supermoto with Adult-Sized Thrills

Introduction

The Aprilia SX 50 SM 2T isn’t just a motorcycle—it’s a gateway drug to the adrenaline-fueled world of supermoto riding. Designed for riders aged 16+ in Europe (or anyone craving lightweight fun), this 50cc two-stroke packs a surprising punch in a package that laughs at conventional "beginner bike" expectations. From 2019 to 2021, Aprilia refined this pocket rocket with Euro 4 compliance, aggressive styling, and components borrowed from its larger siblings. Let’s dissect why this machine remains a cult favorite among urban riders and track day enthusiasts alike.

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Design & Ergonomics: Big Bike Attitude in a Compact Frame

At first glance, the SX 50 SM 2T could be mistaken for its larger 125cc cousins. The twin-tube steel frame wears Aprilia’s signature racing livery—black/red/grey/green schemes that scream Italian motorsport heritage. Despite its 94 kg dry weight (207 lbs), the bike feels planted, thanks to a wheelbase ranging between 1365-1395 mm (53.7-54.9 inches) across model years.

The seat height varies from 820 mm (32.3") to 875 mm (34.4"), accommodating both shorter inseams and taller riders craving a proper supermoto stance. Narrow bodywork lets you grip the tank effortlessly, while the flat handlebar setup encourages aggressive countersteering. It’s a bike that wears its "Factory" badge seriously—the 2020-2021 models flaunt USD forks and bold graphics that make parking lot stops feel like podium finishes.

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Engine & Performance: Two-Stroke Theatre

The Heartbeat:
- 50cc Liquid-Cooled Single Cylinder: Don’t let displacement fool you. The 40 x 39.3 mm bore/stroke (1.6 x 1.5") two-stroke delivers a frenetic 6-speed symphony.
- Dell’Orto PHVA 17.5 Carburetor: Electronically controlled in later models, it balances Euro 4 emissions with the raw thrill of premix nostalgia.
- Power Delivery: Expect a violent rush from 7,000 RPM onward—the CDI ignition unleashes a crescendo that’ll have you clutching like a Grand Prix rider.

Real-World Rideability:
Urban commutes become playground sessions. The 6-speed gearbox (wet multi-plate clutch) lets you short-shift through traffic or wring it out to its 11,500 RPM ceiling on backroads. Fuel consumption sits at 3.14 L/100 km (74.91 mpg), but economy isn’t the point—this engine exists to convert every drop of 98-octane into grins.

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Chassis & Handling: Where the SX 50 SM 2T Shines

Suspension:
- Front: 41 mm USD forks (Factory models) with 240 mm (9.4") travel devour curbs and whoops. Base models use 37 mm telescopic forks—still competent but less track-ready.
- Rear: Steel swingarm paired to a linkage-mounted monoshock offers 200 mm (7.9") of travel. Preload adjustment is minimal, but the setup works brilliantly for 65-85 kg riders.

Brakes & Wheels:
- Front: 260 mm disc (220 mm on early models) with a 2-piston caliper—adequate for 50cc speeds but begging for braided lines.
- Rear: 220-260 mm disc (model-dependent) provides predictable slide control.
- 17” Alloy Wheels: Shod with 100/80-17 front and 130/70-17 rubber, they’re wide enough for knee-down antics yet narrow enough to flick like a trials bike.

Weight Distribution:
At 104 kg wet (229 lbs), the SX 50 SM 2T pivots on its axis like a BMX bike. Stand-up wheelies require minimal effort, and tight U-turns become second nature.

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Competition: How It Stacks Up

1. KTM 50 SX-E

• Pros: Electric start, slightly lighter (92 kg).
• Cons: Less road-biased, no 6th gear, pricier parts.
• Verdict: Better for pure off-road; Aprilia dominates mixed-surface versatility.

2. Husqvarna TC50

• Pros: Premium WP suspension, stronger low-end torque.
• Cons: Euro 4 tuning neuters top-end compared to Aprilia’s screaming Dell’Orto.
• Verdict: A dirt warrior vs. Aprilia’s urban gladiator.

3. Yamaha DT50X

• Pros: Legendary reliability, lower seat height (810 mm).
• Cons: Air-cooled engine feels agricultural next to Aprilia’s liquid-cooled fury.
• Verdict: Choose Yamaha for durability, Aprilia for sheer theatrics.

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Maintenance: Keeping the Beast Alive

Critical Tips from MOTOPARTS.store Experts:

1. Two-Stroke Upkeep
2. Oil Injection: Trust but verify. Upgrade to a high-quality synthetic 2T oil (e.g., Motul 710) to prevent seizures.

3. Carb Tuning: Clean the Dell’Orto every 1,500 km. Consider a JD Jet Kit for altitude adjustments.

4. Suspension Refresh

5. Fork Seals: Replace annually if ridden hard. Our store stocks OEM and All Balls Racing kits.

6. Linkage Bearings: Grease every 3,000 km to avoid costly swingarm repairs.

7. Performance Mods

8. Exhaust: Swap the stock pipe for an Arrow or LeoVince system (+15% power gains).

9. Sprockets: -1/+2 tooth setups transform city acceleration.

10. Aesthetic Upgrades

11. Grips & Levers: ASV shorty levers and Renthal dual-density grips improve control.
12. Decal Kits: Customize with Aprilia Racing replica graphics.

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Conclusion: Why the SX 50 SM 2T Still Matters

The Aprilia SX 50 SM 2T is a motorcycle that refuses to grow up—and we mean that as a compliment. It’s a bike that turns grocery runs into mini-MotoGP sessions and makes parking garages feel like Sardinia’s Tarmac Rally. While newer models lean toward four-strokes and electrification, this two-stroke relic reminds us why internal combustion deserves a standing ovation.

For owners browsing MOTOPARTS.store: Whether you’re chasing a bigger carb, stiffer springs, or simply a fresher look, we’ve got the upgrades to keep your Aprilia howling. Because let’s face it—this isn’t just a bike. It’s a lifestyle.

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Specifications sheet

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