Key Features

The 2014 SL550 Roadster
MSRP $106,700*
Passenger capacity
Trunk Capacity
13.5 cu ft
Transmission type
7-speed automatic
4.6L biturbo V-8
429 hp @ 5,250 rpm
Acceleration, 0-60 mph
4.5 sec (est)
City fuel economy
18 mpg
Highway fuel economy
25 mpg

Interior Dimensions

39.1 in
Hip Room
53.6 in
Shoulder room
55.5 in
Trunk capacity
13.5 cu ft (top up)
8.5 cu ft (top down)

More Exterior Dimensions

Overall height
51.8 in
Overall length
181.6 in
Overall width
82.6 in (w/mirrors)
101.8 in
Coefficient of drag
Curb weight
3,935 lbs (est.)


  • Engine, Drivetrain, and Performance

    Engine, Drivetrain, and Performance

    Net power
    429 hp @ 5,250 rpm
    Net torque
    516 lb-ft  @ 1,800-3,500 rpm
    Compression ratio
    Diecast alloy block and heads
    Fuel requirement
    Premium unleaded
    Fuel capacity
    19.8 gal
    Fuel economy
    City fuel economy
    18 mpg
    Highway estimate
    25 mpg
    Emission certification
    7-speed automatic
    Drive configuration
    Rear-wheel drive
    Final drive ratio
    2.65 : 1
    Acceleration, 0-60 mph
    4.5 sec (est.)
  • Chassis and Traction Control/Stability Systems

    Chassis and Traction Control/Stability Systems

    Semi-active suspension with adaptive damping
    The semi-active Adaptive Damping System continually adjusts to driving inputs and the road surface, and can respond at each wheel in just 10 milliseconds to sharpen handling while the ride stays silky. Comfort and Sport modes let you tailor handling response and ride firmness to your present driving style. Virtually all components of the 4-wheel multilink suspension are made of rigid, lightweight aluminum.
    Steering type
    Rack-and-pinion with electromechanical power assist and Direct-steer
    Turning circle
    36.2 ft., curb to curb
    Traction Control & Stability
    Electronic Stability Control (ESP)
    This safety breakthrough first introduced by Mercedes-Benz continually monitors your driving inputs and the vehicle's motion to help keep it going in your intended direction, especially in corners and during evasive maneuvers. If it detects wheelspin, severe understeer (plowing), or oversteer (fishtailing), ESP® can brake individual wheels and reduce engine power to help bring the vehicle under control.[*4]
  • Brakes, Wheels, and Tires

    Brakes, Wheels, and Tires

    Braking system
    4-wheel disc, including perforated and internally ventilated front discs with 4-piston calipers.
    Adaptive braking technology
    Adaptive braking technology integrates a suite of advances. If you lift off the accelerator quickly, Predictive Brake Priming sets the pads closer to the discs for more immediate response when you apply the brakes. In the rain, Automatic Brake Drying periodically applies the brakes just enough to sweep water build-up from the discs. During uphill starts, Hill-Start Assist helps prevent unwanted rollback. And a brake HOLD feature can make long red lights or stopped traffic a little easier.[*5]
    Antilock Braking System (ABS)
    ABS senses impending wheel lockup under heavy braking and pumps the front brakes individually or the rear brakes together. This intelligent system can pump the brakes as needed up to 30 times per second, to prevent lockup and preserve the driver's steering ability.[*5]
    Brake Assist (BAS®)
    Brake Assist senses emergency braking via the speed at which the driver presses the brake pedal and immediately applies maximum available power boost. Brake Assist can potentially reduce the overall stopping distance by eliminating the delay caused by a common human tendency not to brake hard enough, soon enough. Letting up on the brake pedal releases Brake Assist.[*5]
    Twin 5-spoke, 8.5x18-inch front and 9.5x18-inch rear
    255/40R18 95Y front and 285/35R18 97Y rear
  • Safety and Security Systems

    Safety and Security Systems

    Safety Features
    The first system of its kind, ATTENTION ASSIST continuously monitors different parameters of driving behavior, and can automatically alert the driver with both visual and audible warnings if it detects signs of drowsiness on long trips.
    Another Mercedes-Benz safety breakthrough, PRE-SAFE® can detect instability during certain vehicle maneuvers that suggest a collision or rollover is imminent. It can then tighten the seat belts, adjust the occupied passenger seat, and close the front side windows, all in an effort to better prepare the occupants in the moments before a collision. If no accident occurs, you simply readjust your seat, reopen the windows, and continue on your way.[*6]
    Mercedes-Benz mbrace®
    From your car, your computer or your compatible smartphone, mbrace2™ offers the industry's most comprehensive range of features for more connected, safe and productive drive time. From making your everyday life easier to helping out in an emergency, mbrace2 combines advanced cloud-based and GPS technology with 24-hour support from helpful experts. Three mbrace packages are offered, and every 2014 Mercedes-Benz includes a 6-month mbrace trial subscription.
    Restraint Systems
    Integrated Restraint System
    The sophisticated restraint system includes front air bags with dual deployment thresholds, as well as innovative head air bags, plus thorax side-impact air bags and knee bags for both driver and passenger.[*7]
    Seat belt technology
    Equipped with Emergency Tensioning Devices (ETDs) and belt force limiters, 3-point seat belts are arguably our most important passive safety feature. If a collision exceeds a preset threshold, the ETDs instantly remove slack from the seat belts. Belt force limiters allow a slight amount of give in the seat belts and reduce the peak seat-belt forces on the occupant.
    Occupant Classification System (OCS)
    OCS automatically turns the passenger's front air bag on or off and adjusts the air bag inflation rate based on the weight category determined by weight sensor readings from the passenger seat.
    Locking & Security
    The SmartKey remote control integrates remote door locks and trunk opener, a removable valet key, and a remote panic alarm. You may selectively unlock only the driver's door and fuel filler, or both doors plus the trunk and fuel filler.
    Locator lighting
    Locator lighting uses the car's lights to help illuminate a return path when the car is remote-unlocked in darkness. Unlocking the car also activates the illuminated entry system.
    Emergency trunk opener
    An emergency release lever is located inside the trunk and illuminated for 60 minutes after the trunk lid is closed.
    Night Security Illumination
    The exterior lights can be programmed to turn on for a preset interval when you remote-lock your vehicle in darkness, to help light a path for you as you leave.