Beta RR 50 Enduro 2T (2005-2017): A Lightweight Legend for the Dirt

Introduction

The Beta RR 50 Enduro 2T isn’t just a motorcycle—it’s a rite of passage for aspiring off-road riders. Designed to tackle trails, scramble up hills, and endure the abuse of hardcore enduro riding, this 50cc two-stroke has carved out a cult following since its debut. With a production run spanning over a decade (2005–2017), this generation of the RR 50 became a staple for riders who wanted a lightweight, agile machine that could handle everything from backyard trails to competitive hare scrambles. After spending time with this pocket-sized powerhouse, it’s clear why it remains a favorite among dirt enthusiasts.

---

Engine: Two-Stroke Simplicity Meets Precision

At the heart of the Beta RR 50 Enduro 2T lies a 49.7cc liquid-cooled single-cylinder two-stroke engine. While its displacement might seem modest, don’t let that fool you—this is a motor built to scream. The Dell’Orto PHBN 16 FS carburetor delivers a crisp throttle response, and the 6-speed gearbox ensures you’re never caught off-guard, whether crawling through technical sections or opening up on fire roads.

Key Highlights:
- Two-Stroke Character: The engine’s powerband is typical of a two-stroke—aggressive and thrilling. It rewards riders who keep the revs high, with a satisfying “hit” of power that makes climbing steep inclines or blasting out of corners feel effortless.
- Liquid Cooling: Unlike air-cooled competitors, the RR 50’s liquid-cooling system keeps temperatures stable during prolonged abuse, reducing the risk of seizures in demanding conditions.
- 6-Speed Flexibility: The close-ratio transmission lets you fine-tune your pace. First and second gears are perfect for tight single-track, while sixth gear allows for relaxed cruising at 70–75 km/h (43–47 mph).

The engine’s 40.3 mm bore and 39 mm stroke (1.6 x 1.5 inches) strike a balance between low-end torque and high-revving excitement. Mixing fuel with synthetic oil at a 1.5% ratio is straightforward, though modern riders might appreciate upgrading to an electronic oil injection system for convenience.

---

Chassis and Suspension: Built to Take a Beating

Beta’s steel double-cradle frame is the backbone of this machine. Weighing just 85 kg (187 lbs) dry, the RR 50 feels flickable on tight trails yet stable at speed. The geometry—a 1,325 mm (52.2-inch) wheelbase and 360 mm (14.2-inch) ground clearance—gives it a planted stance while allowing riders to tackle rocks, roots, and ruts without hesitation.

Suspension Setup:
- Front Fork: The 41 mm hydraulic fork offers 245 mm (9.6 inches) of travel. It’s plush enough to absorb small bumps but stiffens progressively under heavy impacts, preventing bottoming-out during hard landings.
- Rear Monoshock: With 270 mm (10.6 inches) of travel and adjustable preload, the rear suspension handles everything from slow-speed technical sections to high-speed jumps. Dialing in the preload is a must for heavier riders or loaded setups.

Brakes and Wheels:
- Front and Rear Discs: The 220 mm (8.7-inch) discs provide ample stopping power, though aftermarket sintered pads are worth considering for muddy or sandy conditions.
- Tire Sizes: The 80/90-21 front and 110/80-18 rear tires strike a balance between agility and traction. Swapping to knobbier rubber (like Michelin Enduro Medium) transforms its grip on loose terrain.

---

On the Trail: Where the RR 50 Shines

Swinging a leg over the RR 50 reveals its purpose: this is a bike designed to make you feel invincible off-road. The seat height—925 mm (36.4 inches)—is accessible for shorter riders, and the narrow profile lets you grip the tank effortlessly with your knees.

Handling Notes:
- Flickable: The lightweight chassis lets you change direction mid-air or pivot around tight switchbacks with minimal effort.
- Stability: Despite its agility, the RR 50 remains composed at speed. The steel frame dampens vibrations, and the weight distribution keeps the front wheel planted on steep descents.
- Ergonomics: The upright riding position and wide handlebars offer excellent control, though taller riders might want aftermarket risers for added comfort.

The 6-liter (1.59-gallon) fuel tank provides a realistic 80–100 km (50–62 miles) range, depending on riding style. Carry a spare fuel bottle for longer adventures.

---

Competition: How the Beta Stacks Up

The 50cc enduro segment is fiercely competitive. Here’s how the RR 50 compares to its rivals:

1. Yamaha DT50X

• Pros: Fuel-injected engine, lower seat height.
• Cons: Heavier (98 kg / 216 lbs), less suspension travel.
• Beta’s Edge: The RR 50’s liquid cooling and superior suspension make it better suited for technical trails.

2. Aprilia RX50

• Pros: Stylish design, street-legal variants.
• Cons: Smaller brakes, less durable chassis.
• Beta’s Edge: The RR 50’s steel frame and adjustable suspension outclass the Aprilia in rough terrain.

3. Derbi Senda X-Treme

• Pros: Peaky two-stroke performance, lightweight.
• Cons: Unreliable electrics, cramped ergonomics.
• Beta’s Edge: Reliability and a more refined power delivery.

---

Maintenance: Keeping Your RR 50 Alive

The RR 50 is built to last, but like any high-performance two-stroke, it demands attention. Here’s how to keep it running strong:

1. Carburetor Tuning:
The Dell’Orto PHBN 16 FS carb is reliable but sensitive to altitude and temperature changes. Consider a jetting kit from MOTOPARTS.store for optimal performance in your region.

2. Suspension Upgrades:
While the stock setup is capable, upgrading to progressive-rate springs or a high-performance shock (e.g., Öhlins TTX) transforms handling on aggressive terrain.

3. Engine Care:
- Piston Rings: Replace every 50–60 hours of hard riding.
- Coolant: Flush annually with a high-quality ethylene glycol mix.
- Air Filter: Clean after every ride; use a pre-oiled Twin Air filter for better filtration.

4. Brake Maintenance:
Swap to braided steel lines for a firmer lever feel, and check rotor thickness regularly (minimum 3 mm / 0.12 inches).

5. Exhaust Upgrades:
An aftermarket expansion chamber (like FMF Fatty) boosts mid-range power and shaves weight.

---

Conclusion: A Timeless Off-Road Companion

The Beta RR 50 Enduro 2T is more than just a beginner’s bike—it’s a masterclass in minimalist design. Its combination of lightweight agility, bombproof construction, and tunable performance makes it a joy to ride, whether you’re carving through forests or honing your skills on a motocross track. While newer models have embraced four-stroke tech, the RR 50’s two-stroke soul ensures it remains a timeless choice for riders who value simplicity and excitement.

Ready to upgrade your RR 50? Explore MOTOPARTS.store’s curated selection of performance parts, from carburetor kits to suspension upgrades, and unleash your bike’s full potential.

---

Specifications sheet

---