These are the known mechanical and performance specifications for your 2009 Derbi Terra 125.
Basic Specs

Engine
Displacement124.20 ccm (7.58 cubic inches)
Type
DetailsSingle cylinder, four-stroke
Max RPM
Compression
Bore/Stroke58.0 x 47.0 mm (2.3 x 1.9 inches)
Valves/Cylinder4
FuelingCarburettor. 30 mm
IgnitionCDI
ExhaustEuro III
LubricationDry sump with integrated oil deposit
CoolingLiquid
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity12.00 litres (3.17 gallons)
Emissions
Chassis
Frame Type
Rake
Trail
Front SuspensionHydraulic fork
Front Travel150 mm (5.9 inches)
Rear SuspensionMono-shock with adjustable spring pre-load.
Rear Travel
Seat
Seat Height795 mm (31.3 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height1,260 mm (49.6 inches)
Total Length2,144 mm (84.4 inches)
Total Width815 mm (32.1 inches)
Ground Clearance
Wheelbase1,440 mm (56.7 inches)
Dry Weight117.0 kg (257.9 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre100/90-18
Rear Tire/Tyre130/80-17
Front BrakesSingle disc
Front Brake Diameter280 mm (11.0 inches)
Rear BrakesSingle disc
Rear Brake Diameter220 mm (8.7 inches)
Wheels
Comments
Derbi is a Soanish brand