Built around ATK's sport motorcycle platform, the 2015 ATK GT650R pairs a 647 cc (39.5 cu in) liquid-cooled v2, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 79 HP (57.7 kW) at 9,250 rpm while maximum torque reaches 66.9 Nm (49.3 lb-ft) at 7,250 rpm, transferring power to the rear wheel through a 6-speed gearbox and chain final drive. With a specific output of 122.1 HP per liter and a 2,000 rpm working window between peak torque (7,250 rpm) and peak power (9,250 rpm), the engine character is reflecting a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.
On the scales, the GT650R measures 204.1 kg (450 lbs) dry, translating to a power-to-weight ratio of 0.39 HP/kg (2.58 kg per horsepower). Rider ergonomics and chassis geometry center around a 831 mm (32.7 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,435 mm (56.5 in) wheelbase engineered for balanced agility and highway composure. The 17.03-liter (4.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's ATK archive, this model family spans 4 indexed model years from 2012 to 2016, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
122.1 HP/L
Power-to-Weight
0.39 HP/kg (2.58 kg/HP)
Power Band Window
7,250–9,250 rpm
Standover Height
831 mm (32.7 in)
Engine
Displacement647.0 ccm (39.48 cubic inches)
Engine TypeV2, four-stroke
Engine Details90° V-twin
Power79.0 HP (57.7 kW)) @ 9250 RPM
Torque66.9 Nm (6.8 kgf-m or 49.3 ft.lbs) @ 7250 RPM
Compression11.6:1
Bore x Stroke81.5 x 62.0 mm (3.2 x 2.4 inches)
Valves/Cylinder4
Fuel SystemInjection. EFI
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
IgnitionCDI
LubricationWet sump
CoolingLiquid
Transmission
Gearbox6-speed
Final DriveChain (final drive)
ClutchWet, Multiplate
DrivelineChain 525. Constant mesh
Chassis
Rake25.0°
Front SuspensionUpside down Telescopic (Compression, Rebound damping adjustable)
Rear SuspensionSwing arm with Progressive linkage Hydraulic Mono shock absorber (Preload adjustable)
Wheelbase1435 mm (56.5 inches)
Ground Clearance165 mm (6.5 inches)
Wheels & Brakes
Front Tyre120/60-ZR17
Rear Tyre160/60-ZR17
Front BrakesDouble disc. Floating rotor, 2 pistons calipers
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.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
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.
