These are the known mechanical and performance specifications for your 2016 GAS GAS TXT Racing 280.
Basic Specs

Engine
Displacement272.20 ccm (16.61 cubic inches)
TypeReed valve.
DetailsSingle cylinder, two-stroke
Max RPM
Compression
Bore/Stroke76.0 x 60.0 mm (3.0 x 2.4 inches)
Valves/Cylinder
FuelingCarburettor. Keihin PWK 28
IgnitionCDI digital magnetic flywheel
Exhaust
Lubrication
CoolingLiquid
Drivetrain
Gearbox6-speed
Final DriveChain
ClutchGG 1/3 hydraulic-diaphragm-system
Driveline
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity2.50 litres (0.66 gallons)
Emissions
Chassis
Frame TypeChrom-Molybdenum tubular frame
Rake
Trail
Front SuspensionMarzocchi 40 mm Aluminium Right-Sight-Up
Front Travel177 mm (7.0 inches)
Rear SuspensionReiger (2-way) hydraulic mono shock absorber
Rear Travel164 mm (6.5 inches)
Seat
Seat Height650 mm (25.6 inches) If adjustable, lowest setting.
Alt. Seat Height
Total Height1,130 mm (44.5 inches)
Total Length2,010 mm (79.1 inches)
Total Width825 mm (32.5 inches)
Ground Clearance
Wheelbase1,320 mm (52.0 inches)
Dry Weight66.0 kg (145.5 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre2.75-21
Rear Tire/Tyre4.00-18
Front BrakesSingle disc. Floating discs. Four-piston calipers.
Front Brake Diameter185 mm (7.3 inches)
Rear BrakesSingle disc. Two-piston calipers.
Rear Brake Diameter150 mm (5.9 inches)
Wheels
Comments
Spanish brand. Model also called Gas Gas TXT Pro 280 Racing.