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Technical Overview
2010 GAS GAS Halley 125 4T Technical Analysis & Specification Breakdown
Positioned in GAS GAS's trial motorcycle lineup, the 2010 GAS GAS Halley 125 4T relies on a 124 cc (7.6 cu in) air-cooled single cylinder, four-stroke powerplant. Internal engine geometry specifies a bore and stroke of 54.0 x 54.5 mm (2.1 x 2.1 inches).
Rider ergonomics and chassis geometry center around a 945 mm (37.2 in) seat height — reflecting a long-travel chassis stance that favors ground clearance and off-pavement control, combined with a 1,460 mm (57.5 in) wheelbase engineered for balanced agility and highway composure.
Standover Height
945 mm (37.2 in)
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Bore x Stroke54.0 x 54.5 mm (2.1 x 2.1 inches)
Fuel SystemCarburettor. 26 mm
CoolingAir
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchMultidisc hydraulically operated
Chassis
Frame TypeMade with Cromoly tubing. Aluminium swing arm. .
Front SuspensionFork, 41 mm.
Front Travel255 mm (10.0 inches)
Rear SuspensionOne-piece aluminium swing arm
Rear Travel246 mm (9.7 inches)
Wheelbase1460 mm (57.5 inches)
Wheels & Brakes
Front Tyre2.75-21
Rear Tyre4.10-18
Front BrakesSingle disc. 2-piston caliper.
Front Brake Ø260 mm (10.2 inches)
Rear BrakesSingle disc. Single-piston
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Seat Height945 mm (37.2 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.
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.
