Derbi debuts GPR 125 4-Stroke

Euro Thriller

Derbi is still a leading brand at the world-level for its ability to offer to young-at-heart riders that go beyond the expectations of even the most demanding riders. It also has an image, high technology, and performance that have rarely been seen before in the 125cc 4-stroke category.

Starting with the new engine, designed specifically by Piaggio and Derbi, the Spanish brand expands its offer adding a new motorcycle that raises the 125cc category to a dimension that has never been known before. Inheriting the GPR name from the previous 2-stroke range, the benchmark for high range sports bikes, Derbi is once again on the cutting edge of the category.

With a maximum power of 15 horsepower at 9,250 rpm (which is precisely the limit established by the new standard), this innovative engine offers unique performances in its category–not only at high speeds, but also as regards to exploitable power ranges, reduced vibrations when idling and high component reliability.

It is a 4-stroke single-cylinder engine with a liquid cooling, a 30mm carburetor, DOHC, four valves, and a 6-speed gearbox. This engine also has the added advantages of being lightweight and externally compact in size, thanks to the dry crankcase lubrication system that allows for an extremely high level chassis.

The Derbi GPR offers the most expert and demanding younger riders a design concept and the technology of high engine displacement superbikes; this gives them the chance to have the bike of their dreams without having to wait to be adult. This target, reached by Derbi and never exceeded by any other brand, led to considerable responsibility when the models evolved.

The most spectacular component of the GPR 125 is undoubtedly the new dual-beam die-cast aluminum chassis. It is made with two pieces joined by the steering column, which ensures great freedom in terms of design, more compact shapes and great rigidity. Just as fascinating and efficient is the rear asymmetrical suspension arm, in line with most advanced trends of high engine displacement super sports motorcycles.

Front suspension boasts a strong Paioli 41mm upside-down fork, red-anodized triple clamps, and 4.3 inches travel; the rear suspension boasts an Ollé single shock absorber system fixed directly to the fork. The front braking system is a single 300 mm diameter disc with four-piston radial caliper, supported by a 220 mm diameter disc with two-piston caliper setup in the rear.

Notwithstanding the highly sporty characteristics, the ease of on-board control was strongly considered right from the beginning, when designing the new Derbi GPR 125 4S, not forgetting that this is a motorcycle to use every day.

Hence its ergonomics is the result of lengthy research, with a satisfying while rather unusual balance between comfort, control and agility. The same can be said for the complete digital instrument panel, with its decidedly innovative design inspired by MotoGP with a modern blue backlit display.

The bike reflects all the spirit of Derbi’s mythical Balas Rojas. The chassis shows off sinuous and stylized lines that start from the mean-looking front with a powerful, integrated double headlight assembly (with LED front daylight running light), continuing in the tank/saddle unit creating a continuous line with the sides of the fairing, and ending in the raised tail which also includes the passenger seat (with removable footpegs) and a rear light that exploits the LED technology. The design of the burnished 12-spoke 17" rims gives an even more sporty character to the bike.

One last detail underlines the high level of finish of the new GPR: the exhaust that is strongly inspired by the MotoGP, completely integrated in the bottom of the fairing. A solution that is not just fascinating from a design point of view, but it also has a strong influence on the bike’s handling, thanks to an even more reduced centre of gravity.

2010 Derbi GPR 125 4-Stroke | Tech Specs


Single cylinder 4-Stroke 4V Euro 3

Bore x stroke

58 x 47 mm




15 HP @ 9,250 rpm

Fuel supply

30mm carburetor

Cooling system


Starting system


Compression ratio



Unleaded petrol

Lubrication system

Dry sump




6 speeds


Double aluminum beam


Asymmetric steel

Front suspension

41 mm upside down
fork. 4.3 mm travel

Rear suspension

Monoshock, 5.1
inches wheel travel

Front brake

300 mm disc w/
4-piston calipers

Rear brake

220 mm disc w/
2-piston calipers


Front: 100/80 x 17”

Rear: 130/70 x 17”

Maximum length


Seat height


Maximum width




Fuel tank

3.4 gallons

Dry weight

265 pounds

NOTE: All specs
provided by Derbi