2021 Boss Hoss Sierra Trike Technical Analysis & Specification Breakdown
Engineered by Boss for the custom - cruiser motorcycle segment, the 2021 Boss Hoss Sierra Trike utilizes a 6200 cc (378.3 cu in) liquid-cooled v8, four-stroke layout. In factory specification, peak output is rated at 445 HP (324.8 kW) while maximum torque reaches 603.4 Nm (445.1 lb-ft) at 4,750 rpm, transferring power to the rear wheel through a automatic gearbox and shaft drive (cardan) final drive. With a specific output of 71.8 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 Hoss Sierra Trike measures 680.4 kg (1500 lbs) dry, translating to a power-to-weight ratio of 0.65 HP/kg (1.53 kg per horsepower). Rider ergonomics and chassis geometry center around a 749 mm (29.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 2,159 mm (85 in) wheelbase engineered for planted straight-line stability. The 32.17-liter (8.5 US gal) fuel tank paired with a rated consumption of 8.5 L/100 km provides an estimated theoretical range of roughly 378 km (235 miles) between fill-ups.
Within MotoLibrary's Boss archive, this model family spans 2 indexed model years from 2019 to 2021, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
71.8 HP/L
Power-to-Weight
0.65 HP/kg (1.53 kg/HP)
Theoretical Range
~378 km (235 mi)
Engine
Displacement6200.0 ccm (378.32 cubic inches)
Engine TypeV8, four-stroke
Power445.0 HP (324.8 kW))
Torque603.4 Nm (61.5 kgf-m or 445.1 ft.lbs) @ 4750 RPM
Compression10.7:1
Valves/Cylinder4
Fuel SystemInjection
Fuel ControlDouble Overhead Cams/Twin Cam (DOHC)
CoolingLiquid
Transmission
GearboxAutomatic
Final DriveShaft drive (cardan) (final drive)
Performance
Fuel Consumption8.50 litres/100 km (11.8 km/l or 27.67 mpg)
Chassis
Front SuspensionInverted forks, 63 mm, adjustable preload
Front Travel89 mm (3.5 inches)
Rear SuspensionAir ride
Wheelbase2159 mm (85.0 inches)
Ground Clearance152 mm (6.0 inches)
Wheels & Brakes
Front Tyre130/90-16
Rear Tyre235/60-17
Front BrakesDouble disc. Dual 4-piston caliper, floating disc
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.
