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2018 Mercedes-Benz SL 550 Roadster Specifications
Vehicle Type
Two-seat roadster with power-operated retractable hard top
Chassis
Aluminum unibody
Drive Configuration
Rear Wheel Drive
Exterior Dimensions (in)
Wheelbase
101.7
Length
182.3
Width (w/ mirrors)
82.6
Width (w/o mirrors)
76.7
Height
51.2
Track (front / rear)
62.8 / 63.0
Ground Clearance (max load)
3.7
4,012
Interior Dimensions (in)
Head room
39.1
Leg room
42.9
Shoulder room
55.5
Suspension
Front
Independent multi-link suspension with coil spring, Single-tube shock absorber with continuously adjustable damping and
tubular torsion bar
Rear
Independent multi-link suspension with coil spring, Single-tube shock absorber with continuously adjustable damping and
tubular torsion bar
Steering
Type
Speed-dependent, electro-mechanical rack-and-pinion
Ratio
15.7 : 1
Turning Circle (ft)
36.2
Brake Disc Diameter / Thickness (in.)
Front
13.5 / 1.4
Rear
12.6 / .94
Standard Wheels (in)
Front
8.5 x 19 (Cast)
Rear
9.5 x 19 (Cast)
Standard Tires
Front
255 / 40 R18
Rear
285 / 35 R18
Engine
Engine Type
4.7L V8 Biturbo
Engine Material
Aluminum-Alloy
Valvetrain / Arrangement
DOHC, 4-valves per cylinder
Displacement (cc)
4,663
Bore (in / mm)
3.66 / 92.9
Stroke (in / mm)
3.39 / 86.0
Compression Ratio
10.5 : 1
Horsepower @ rpm
449 @ 5,500 – 6,000
Torque @ rpm
516 @ 1,800 –3,500
Redline (rpm)
6,300
Transmission
Transmission Type
9G-TRONIC 9-speed automatic
Shift Controls
Wheel-mounted shift paddles
Gear Ratios:
1st
5.35 : 1
2nd
3.24 : 1
3rd
2.25 : 1
4th
1.64 : 1
5th
1.21 : 1
6th
1.00 : 1
7th
0.86 : 1
8th
0.72 : 1
9th
0.60 : 1
Reverse
4.80 : 1
Final Drive
2.65 : 1
Performance
0-60 mph (sec)
4.3
Top Speed (mph)
155 (electronically limited)
Vehicle Type
Two-seat roadster with power-operated retractable hard top
Chassis
Aluminum unibody
Drive Configuration
Rear Wheel Drive
Exterior Dimensions (in)
Wheelbase
101.7
Length
182.3
Width (w/ mirrors)
82.6
Width (w/o mirrors)
76.7
Height
51.2
Track (front / rear)
62.8 / 63.0
Ground Clearance (max load)
3.7
4,012
Interior Dimensions (in)
Head room
39.1
Leg room
42.9
Shoulder room
55.5
Suspension
Front
Independent multi-link suspension with coil spring, Single-tube shock absorber with continuously adjustable damping and
tubular torsion bar
Rear
Independent multi-link suspension with coil spring, Single-tube shock absorber with continuously adjustable damping and
tubular torsion bar
Steering
Type
Speed-dependent, electro-mechanical rack-and-pinion
Ratio
15.7 : 1
Turning Circle (ft)
36.2
Brake Disc Diameter / Thickness (in.)
Front
13.5 / 1.4
Rear
12.6 / .94
Standard Wheels (in)
Front
8.5 x 19 (Cast)
Rear
9.5 x 19 (Cast)
Standard Tires
Front
255 / 40 R18
Rear
285 / 35 R18
Engine
Engine Type
4.7L V8 Biturbo
Engine Material
Aluminum-Alloy
Valvetrain / Arrangement
DOHC, 4-valves per cylinder
Displacement (cc)
4,663
Bore (in / mm)
3.66 / 92.9
Stroke (in / mm)
3.39 / 86.0
Compression Ratio
10.5 : 1
Horsepower @ rpm
449 @ 5,500 – 6,000
Torque @ rpm
516 @ 1,800 –3,500
Redline (rpm)
6,300
Transmission
Transmission Type
9G-TRONIC 9-speed automatic
Shift Controls
Wheel-mounted shift paddles
Gear Ratios:
1st
5.35 : 1
2nd
3.24 : 1
3rd
2.25 : 1
4th
1.64 : 1
5th
1.21 : 1
6th
1.00 : 1
7th
0.86 : 1
8th
0.72 : 1
9th
0.60 : 1
Reverse
4.80 : 1
Final Drive
2.65 : 1
Performance
0-60 mph (sec)
4.3
Top Speed (mph)
155 (electronically limited)