These are the known mechanical and performance specifications for your 2009 Derbi GPR 50 Racing Race Replica.
Basic Specs

Engine
Displacement49.90 ccm (3.04 cubic inches)
Type
DetailsSingle cylinder, two-stroke
Max RPM
Compression11.5:1
Bore/Stroke39.9 x 40.0 mm (1.6 x 1.6 inches)
Valves/Cylinder
FuelingCarburettor. Ø17,5 Carburettor
IgnitionElectronic CDI
Exhaust
LubricationOil pump
CoolingLiquid
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity13.00 litres (3.43 gallons)
Emissions
Chassis
Frame Type
Rake
Trail
Front SuspensionØ40 mm upside-down fork.
Front Travel110 mm (4.3 inches)
Rear SuspensionMonoshock.
Rear Travel110 mm (4.3 inches)
Seat
Seat Height
Alt. Seat Height
Total Height
Total Length1,961 mm (77.2 inches)
Total Width720 mm (28.3 inches)
Ground Clearance
Wheelbase1,311 mm (51.6 inches)
Dry Weight116.0 kg (255.7 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre100/80-17
Rear Tire/Tyre130/70-17
Front BrakesSingle disc
Front Brake Diameter300 mm (11.8 inches)
Rear BrakesSingle disc
Rear Brake Diameter180 mm (7.1 inches)
Wheels
Comments
Derbi is a Spanish brand.