Positioned in Polaris's atv motorcycle lineup, the 2021 Polaris Sportsman 450 H.O. pairs a 500 cc (30.5 cu in) liquid-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 33 HP (24.1 kW), transferring power to the rear wheel through a automatic gearbox and shaft drive (cardan) final drive. With a specific output of 66 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.
On the scales, the Sportsman 450 H.O. measures 317.5 kg (700 lbs) dry, translating to a power-to-weight ratio of 0.1 HP/kg (9.62 kg per horsepower). Rider ergonomics and chassis geometry center around a 845 mm (33.3 in) seat height — resulting in a taller command-style riding posture suited to medium-to-tall inseams, combined with a 1,283 mm (50.5 in) wheelbase engineered for quick, flickable steering geometry. The 17-liter (4.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Polaris archive, this model family spans 4 indexed model years from 2021 to 2024, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
66 HP/L
Power-to-Weight
0.1 HP/kg (9.62 kg/HP)
Standover Height
845 mm (33.3 in)
Engine
Displacement500.0 ccm (30.51 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsProstar engine
Power33.0 HP (24.1 kW))
Fuel SystemInjection
Fuel ControlSingle Overhead Cams (SOHC)
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveShaft drive (cardan) (final drive)
DrivelineOn-demand all-wheel drive
Chassis
Front SuspensionSealed MacPherson Strut
Front Travel208 mm (8.2 inches)
Rear SuspensionSealed Dual A-Arm, IRS
Rear Travel241 mm (9.5 inches)
Wheelbase1283 mm (50.5 inches)
Ground Clearance292 mm (11.5 inches)
Wheels & Brakes
Front Tyre25/8-12
Rear Tyre25/10-12
Front BrakesSingle disc
Rear BrakesSingle disc
WheelsStamped steel
Dimensions & Weight
Dry Weight317.5 kg (700.0 pounds)
Power/Weight0.1039 HP/kg
Seat Height845 mm (33.3 inches) If adjustable, lowest setting.
Overall Height1220 mm (48.0 inches)
Overall Length2108 mm (83.0 inches)
Overall Width1219 mm (48.0 inches)
Fuel Capacity17.00 litres (4.49 US gallons)
Other
StarterElectric
Color OptionsBlue, green
InstrumentsDigital Gauge, Analog Speedometer, Odometer, Tachometer, Tripmeter, Gear Indicator, Fuel Gauge, AWD Indicator, Hi-Temp/Low-Batt Lights, DC Outlet
LightDual 50w Low Beam Bumper Lights, Single 50w High Beam Pod Light; Dual Brakelights/Taillights
Carrying CapacityLock and Ride Compatible 5 Gal (18.9L) Front Dry Storage
Notes
On-Demand True AWD/2WD. HO means high output engine.
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.
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.
