These are the known mechanical and performance specifications for your 2010 Beta RE 125 4T.
Basic Specs

Engine
Displacement124.00 ccm (7.57 cubic inches)
Type
DetailsSingle cylinder, four-stroke
Max RPM
Compression10.0:1
Bore/Stroke54.0 x 54.0 mm (2.1 x 2.1 inches)
Valves/Cylinder
FuelingCarburettor
Ignition
Exhaust
LubricationForced with pump
CoolingAir
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity5.70 litres (1.51 gallons)
Emissions
Chassis
Frame Type
Rake
Trail
Front SuspensionHydraulic fork
Front Travel240 mm (9.4 inches)
Rear SuspensionMonoshock with adjustable spring preload
Rear Travel205 mm (8.1 inches)
Seat
Seat Height890 mm (35.0 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height1,200 mm (47.2 inches)
Total Length2,070 mm (81.5 inches)
Total Width820 mm (32.3 inches)
Ground Clearance292 mm (11.5 inches)
Wheelbase1,370 mm (53.9 inches)
Dry Weight103.0 kg (227.1 pounds)
Wet Weight110.0 kg (242.5 pounds)
Wheels & Brakes
Front Tire/Tyre90/90-21
Rear Tire/Tyre120/80-18
Front BrakesSingle disc
Front Brake Diameter260 mm (10.2 inches)
Rear BrakesSingle disc
Rear Brake Diameter220 mm (8.7 inches)
Wheels
Comments
Various tyre options.