Derbi Mulhacén 125 [2007–2013]: A Scrambler-Styled Urban Companion Revisited

Introduction

The Derbi Mulhacén 125, produced between 2007 and 2013, occupies a unique space in the lightweight motorcycle segment. Blending scrambler aesthetics with urban practicality, this Spanish-built machine was designed to appeal to riders seeking style and versatility without the bulk of larger engines. With its tubular steel frame, liquid-cooled DOHC engine, and mixed-surface tire options, the Mulhacén carved out a niche as a “do-it-all” 125cc bike. But how does it hold up today? Let’s dive into the details.

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Design & Aesthetics

Derbi’s design team took inspiration from its larger Mulhacén 659 sibling, distilling the rugged scrambler look into a compact, learner-friendly package. The tubular steel frame isn’t just functional—it’s a styling statement, exposed in all its industrial glory. Early models like the 2007 Mulhacén 125ST Freexter prototype experimented with bold color schemes (white/orange), while production versions settled into more subdued palettes like black, red, and café racer-inspired two-tone combinations.

The bike’s proportions are a study in contrasts. A 100/90-18 front tire (130/80-17 rear on base models) gives it a slightly raised stance, while the narrow 750–810 mm (29.5–31.9 in) overall width keeps it lane-splitting friendly. The seat height ranges from 750 mm (29.5 in) on standard models to 790 mm (31.1 in) on Café variants—manageable for shorter riders but tall enough to provide clearance for light off-road excursions.

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Engine & Performance

The Heart of the Matter

At its core lies a 124.2 cc liquid-cooled single-cylinder four-stroke engine with DOHC and four valves. Early models (2007–2009) boasted a peppy 20.1 HP (14.7 kW) @ 9,250 RPM, but Euro III compliance later reduced output to 15 HP (10.9 kW). The 58 x 47 mm bore/stroke ratio prioritizes free-revving character over low-end torque, requiring riders to work the slick 6-speed gearbox to stay in the powerband.

On the Road

Twist the throttle, and the engine’s personality emerges. Below 6,000 RPM, it’s docile—perfect for city traffic. But climb past 7,000 RPM, and the little single comes alive, pulling eagerly to its 9,250 RPM redline. The 12.0:1 compression ratio demands premium fuel, but contributes to a surprisingly throaty exhaust note for a 125cc machine.

Top speed? Expect about 110 km/h (68 mph) on flats, though headwinds or hills will see that drop. The real joy isn’t outright speed—it’s the bike’s willingness to play. The light 110–124 kg (242.5–273.4 lb) wet weight makes flicking through traffic or carving backroads an absolute hoot.

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Handling & Ride Experience

Chassis Dynamics

The tubular steel frame provides a rigid foundation, while suspension travel varies by model: - Standard: 37 mm hydraulic fork (130 mm/5.1 in travel) + monoshock rear - Café: 40 mm inverted fork (110 mm/4.3 in) + revised monoshock

Despite the scrambler looks, this is no dirt bike. The 1326–1335 mm (52.2–52.6 in) wheelbase and 17–18” spoked wheels shod with street-biased rubber (100/90-18 front, 130/80-17 rear) favor paved surfaces. Yet, the long-travel suspension soaks up potholes better than most road-focused 125s.

Braking & Control

Single 220–280 mm discs front/rear provide adequate stopping power for the bike’s weight. ABS wasn’t an option, so newer riders should practice progressive lever control. The cable-operated clutch (multi-plate wet design) offers light action—a blessing in stop-and-go traffic.

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Competition

How does the Mulhacén stack up against contemporaries?

1. Yamaha MT-125 (2014–):
   Though newer, Yamaha’s liquid-cooled 15 HP single shares the Derbi’s spirit. The MT trades retro charm for modern tech like ABS and a diagonal rear shock. Verdict: More refined, less character.

2. Honda CB125F (2015–):
   Honda’s air-cooled 124cc engine prioritizes fuel efficiency (58.8 km/L) over excitement. The CB is cheaper to run but lacks the Derbi’s sporty edge.

3. KTM 125 Duke (2011–):
   The Austrian’s 15 HP liquid-cooled engine and trellis frame target sport riders. It’s sharper but less versatile than the Mulhacén.

Derbi’s Edge: Unique styling, accessible seat height, and suspension tuned for real-world roads. Where it lags—no modern fuel injection or ABS.

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Maintenance & Ownership

Key Considerations

• Engine Care: The DOHC valvetrain demands regular checks (every 5,000 km/3,100 mi). Use NGK CR8EB/CR8EIX plugs gapped to 0.8 mm.
• Cooling System: Flush coolant every 2 years or 10,000 km (6,200 mi). Watch for leaks at the 58 mm bore’s water jacket.
• Chain Maintenance: The O-ring chain needs cleaning/lubing every 500 km (310 mi). Consider upgrading to a DID 428VX chain for longevity.
• Brake Service: DOT 4 fluid changes annually. Swap organic pads for sintered ones if riding aggressively.

MOTOPARTS.store Recommendations

• Performance: DNA air filters improve throttle response.
• Comfort: Gel seat covers combat the firm stock saddle on long rides.
• Style: Retro round mirrors enhance the scrambler aesthetic.
• Protection: Crash bars (model-specific) guard that beautiful frame in tip-overs.

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Conclusion

The Derbi Mulhacén 125 isn’t about specs—it’s about soul. In a sea of plasticky commuters, its raw mechanical charm and go-anywhere stance still turn heads. While modern 125s outgun it technologically, few match its personality. For urban riders craving style with a side of backroad fun, this Spanish scrambler remains a compelling choice. Just keep up with maintenance, and it’ll reward you with miles of grinning rides.

Looking to refresh your Mulhacén? Explore our curated selection of Derbi parts & accessories to keep your ride running—and looking—its best.

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Specifications sheet

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