2005 Derbi GPR 125 Racing Technical Analysis & Specification Breakdown
At the heart of the 2005 Derbi GPR 125 Racing sport motorcycle, Derbi pairs a 124.8 cc (7.6 cu in) liquid-cooled single cylinder, two-stroke architecture with road-focused gearing. Internal engine geometry specifies a bore and stroke of 56.0 x 50.7 mm (2.2 x 2.0 inches) with a 12.5:1 compression ratio.
Rider ergonomics and chassis geometry center around a 800 mm (31.5 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,355 mm (53.3 in) wheelbase engineered for quick, flickable steering geometry. The 13-liter (3.4 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Derbi archive, this model family spans 4 indexed model years from 2005 to 2009, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Standover Height
800 mm (31.5 in)
Engine
Displacement124.8 ccm (7.61 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Compression12.5:1
Bore x Stroke56.0 x 50.7 mm (2.2 x 2.0 inches)
Fuel SystemCarburettor. Mikuni 28
IgnitionElectronic C.D.I.
LubricationOil pump
CoolingLiquid
Transmission
Gearbox6-speed
ClutchMulti-disc
Chassis
Front SuspensionInverted fork.
Front Travel120 mm (4.7 inches)
Rear SuspensionMonoshock
Rear Travel110 mm (4.3 inches)
Wheelbase1355 mm (53.3 inches)
Wheels & Brakes
Front Tyre110/80-17
Rear Tyre140/70-17
Front BrakesSingle disc. 2-piston calipers
Front Brake Ø300 mm (11.8 inches)
Rear BrakesSingle disc. 2-piston calipers
Rear Brake Ø180 mm (7.1 inches)
Dimensions & Weight
Seat Height800 mm (31.5 inches) If adjustable, lowest setting.
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
