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MotoLibrary Score
38/100Commuter
Power/Weight
0.16 hp/kg
Torque
23 Nm
Engine
278 ccm
Technical Overview
2025 Royal Alloy GP 300 Technical Analysis & Specification Breakdown
Positioned in Royal's scooter motorcycle lineup, the 2025 Royal Alloy GP 300 pairs a 278 cc (17 cu in) liquid-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 24.1 HP (17.6 kW) at 7,500 rpm while maximum torque reaches 23 Nm (17 lb-ft) at 5,000 rpm, transferring power to the rear wheel through a automatic gearbox and belt final drive. With a specific output of 86.7 HP per liter and a 2,500 rpm working window between peak torque (5,000 rpm) and peak power (7,500 rpm), the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Alloy GP 300 measures 152 kg (335 lbs) dry, translating to a power-to-weight ratio of 0.16 HP/kg (6.31 kg per horsepower). Rider ergonomics and chassis geometry center around a 770 mm (30.3 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance, combined with a 1,390 mm (54.7 in) wheelbase engineered for quick, flickable steering geometry. The 10.5-liter (2.8 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Specific Output
86.7 HP/L
Power-to-Weight
0.16 HP/kg (6.31 kg/HP)
Power Band Window
5,000–7,500 rpm
Standover Height
770 mm (30.3 in)
Engine
Displacement278.0 ccm (16.96 cubic inches)
Engine TypeSingle cylinder, four-stroke
Power24.1 HP (17.6 kW)) @ 7500 RPM
Torque23.0 Nm (2.3 kgf-m or 17.0 ft.lbs) @ 5000 RPM
Compression11.0:1
Bore x Stroke75.0 x 63.0 mm (3.0 x 2.5 inches)
Valves/Cylinder4
Fuel SystemInjection. Magnetti Marelli EFI
Fuel ControlSingle Overhead Cams (SOHC)
LubricationPressure splash
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveBelt (final drive)
ClutchAutomatic
DrivelineCVT
Performance
Emission DetailsEuro 5
Chassis
Frame TypeSteel space frame with steel body
Front SuspensionDouble preload adjustable with anti-dive
Rear SuspensionTwin Adjustable hydraulic coil
Wheelbase1390 mm (54.7 inches)
Ground Clearance160 mm (6.3 inches)
Wheels & Brakes
Front Tyre110/70-12
Rear Tyre120/70-12
Front BrakesSingle disc. ABS
Front Brake Ø220 mm (8.7 inches)
Rear BrakesSingle disc. ABS
Rear Brake Ø220 mm (8.7 inches)
Dimensions & Weight
Dry Weight152.0 kg (335.1 pounds)
Power/Weight0.1588 HP/kg
Seat Height770 mm (30.3 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.
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.
