Rev it up and ride fearless. Onslaught™ rides smooth and delivers more power than you'll ever need.

Tackle trails – and to-do lists. Our Onslaught™ 550 ATV gives you plenty of power, and an EFI engine that knows how to make the most of it.


  • POWER: Onslaught brings more than enough power with a liquid-cooled 503cc engine featuring electronic fuel injection.
  • SUSPENSION AND HANDLING: Electronic Power Steering and four-wheel double A-arm suspension give you total command and comfort.
  • RELIABILITY: Onslaught is backed with an unsurpassed 1 year warranty.

Suspension and Handling

  • FOUR-WHEEL DOUBLE A-ARM SUSPENSION: Onslaught makes every ride a smooth one with its precision-tuned, four-wheel, double A-Arm suspension. From springs to shocks, our suspension system effortlessly conquers challenging terrain.
  • ELECTRONIC POWER STEERING (EPS): The power doesn't have to stop at the engine. Take command with an Onslaught EPS model and get the easiest, most responsive steering available.
  • BEST-IN-CLASS 12 IN. GROUND CLEARANCE: Onslaught clears obstacles before they ever become a problem, with more ground clearance than anything else in its class.

General Information

Manufacturer Bad Boy Off Road
Model Year 2017
Model Onslaught 550
Model Code 646891
Color Black



Brake system - Hydraulic disc (200 mm, 180 mm)

Rear foot brake

Parking brake - Lockable hand lever

Wheels Steel

Front - AT25 x 8-12

Rear - AT25 x 10-12


Length Overall - 84.8 in. (2,155 mm)
Height Overall - 49.2 in. (1,250 mm)
Width Overall - 48.6 in. (1,235 mm)
Weight Wet - 803 lb. (364 kg)
Ground Clearance 12 in. (30 cm)
Wheelbase 50.4 in. (1,280 mm)
Seat Height 36.1 in. (914 mm)



Drive Train - CVT

Gear Selection - L/H/N/R

Differentials - Manual locking

Drive System 4x4


Battery 12V, 18Ah
Instrumentation Digital instrument panel with odometer, speedometer, tripmeter, rpm, transmission position, fuel gauge, hi-temp / low-batt lights, high beam light, EFI checking, differential indicator, 2WD/4WD indicator, 12V DC outlet
Lighting Dual 60W low / high beam lights, third-head light, dual brake lights, taillights


Engine 4-stroke, SOHC single-cylinder, gas
Cooling Liquid
Horsepower 39 hp
Displacement 503 cc
Fuel System Electronic Fuel Injection (EFI)
Starting Electric
Fuel Capacity 4.2 gal. (16 l)


Frame Structurally welded high strength steel

Front - Double A-arm; Travel - 8.7 in. (22 cm)

Rear - Double A-arm, IRS; Travel - 9.4 in. (24 cm)

Steering Standard
Load Capacity

Front - 675 lb. (306 kg)

Rear - 679 lb. (308 kg)

Front rack (with max loading) - 99 lb. (45 kg)

Rear rack (with max loading) - 165 lb. (75 kg)


Additional Colors Olive Green
Warranty 1 Year

2017 Bad Boy Off Road Onslaught 550