14 August. Friday 2026
Boss Hoss Sierra Trike - 2021 Specifications and Reviews
The 2021 Boss Hoss Sierra Trike is an extreme custom cruiser built for thrill-seeking riders who demand raw power and unconventional style. Powered by a massive 6.2L V8 engine producing 445 horsepower and 603 Nm of torque, it's best known for delivering supercar-level performance in three-wheeled form. Its automatic transmission and shaft drive make it accessible to riders seeking maximum impact with minimal mechanical complexity.
2021
General information | |
| Category | Custom / cruiser |
| Year | 2021 |
| Model | Boss Hoss Sierra Trike |
| | |
Engine and Transmission Specifications | |
| Exhaust system | 2.5 inch with dual mufflers |
| Greenhouse gases | 197.2 CO2 g/km. (CO2 - Carbon dioxide emission) |
| Fuel consumption | 8.50 litres/100 km (11.8 km/l or 27.67 mpg) |
| Driveline | 4-speed automatic overdrive with lockup |
| Transmission type | Shaft drive (cardan) (final drive) |
| Gearbox | Automatic |
| Cooling system | Liquid |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) |
| Fuel system | Injection |
| Valves per Cylinder | 4 |
| Compression | 10.7:1 |
| Torque | 603.4 Nm (61.5 kgf-m or 445.1 ft.lbs) @ 4750 RPM |
| Power | 445.0 HP (324.8 kW) |
| Engine details | Cast aluminium - 6 bolt main |
| Engine type | V8, four-stroke |
| Capacity: | 6200.0 ccm (378.32 cubic inches) |
Brakes, suspension, Frame and wheels | |
| Wheels | Two rear wheels |
| Rear brakes | Single disc. 2-piston, floating calipers |
| Diameter | 320 mm (12.6 inches) |
| Front brakes | Double disc. Dual 4-piston caliper, floating disc |
| Rear tire | 235/60-17 |
| Front tire | 130/90-16 |
| Rear Suspension | Air ride |
| Front wheel travel | 89 mm (3.5 inches) |
| Front Suspension | Inverted forks, 63 mm, adjustable preload |
| Rake (fork angle) | 35.0° |
| | |
Physical measures and capacities | |
| Fuel capacity | 32.17 litres (8.50 US gallons) |
| Wheelbase | 2159 mm (85.0 inches) |
| Ground clearance | 152 mm (6.0 inches) |
| Overall width | 1524 mm (60.0 inches) |
| Overall length | 3505 mm (138.0 inches) |
| Seat height | 749 mm (29.5 inches) If adjustable, lowest setting. |
| Power/weight ratio | 0.6540 HP/kg |
| Dry weight | 680.4 kg (1,500.0 pounds) |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Comments | Three wheel bike. Optional 295 hp engine. |
| Factory warranty | One year, unlimited mileage |
| Carrying capacity | Trunc |
| Starter | Electric |
| Color options | Blue/Yellow |
Performance Profile & Rider Fit
445 hp
Peak Power
4.2s
0-60 mph
Best For
Track30%
City25%
Cornering20%
Daily Riding45%
Touring55%
Passenger75%
Rider Profile
| Best For | This is a machine for confident, experienced riders who are comfortable managing a massive V8 engine and a wide, three-wheeled chassis rather than leaning into corners like a traditional motorcycle. |
| Purpose | Built as a spectacle cruiser trike, it exists to deliver outrageous straight-line V8 power and show-stopping presence rather than for sporty handling or off-road capability. |
| Rider Fit | At over 680 kg dry with a 60-inch width, it demands strength and spatial awareness at low speed and in parking maneuvers, though the trike layout removes the need to balance the bike at a stop. |
| Character | Loud, brash, and unapologetically excessive, this trike trades finesse for raw automotive-grade horsepower delivered through a shaft-driven automatic transmission. |
| Not Ideal For | It is not for riders seeking nimble cornering, off-road ability, or a lightweight, traditional two-wheeled motorcycling experience. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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Rider Reviews
Total comments: 1
MotorcycleDB Review
The 2021 Boss Hoss Sierra Trike motorcycle is an impressive machine that offers a perfect blend of power, performance, and style. The trike's bold and striking design is sure to turn heads wherever it goes, and its powerful engine delivers an exhilarating riding experience. With its comfortable seating and advanced suspension system, the Sierra Trike provides a smooth and enjoyable ride, making it the perfect choice for long road trips or leisurely weekend rides. Whether you're a seasoned rider or a newcomer to the world of motorcycles, the Boss Hoss Sierra Trike is sure to impress with its impressive performance and eye-catching design. In addition to its impressive performance, the 2021 Boss Hoss Sierra Trike motorcycle also offers a range of advanced features that enhance the riding experience. The trike is equipped with cutting-edge technology and safety features, including advanced braking systems and customizable rider modes. Its spacious storage compartments also make it practical for carrying essentials on the road. Overall, the Boss Hoss Sierra Trike is a top-of-the-line motorcycle that offers a perfect combination of style, performance, and innovative features for riders looking for a thrilling and enjoyable riding experience.Add a Comment
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