Mercedes-Benz 300 SLR 

  • 1955
  • 310 HP 3.0L
  • 186 mph
In addition to an anti-lock braking aid designed for emergency situations which worked by injecting oil onto the surface of the brakes - and the hydraulic brake booster, Mercedes-Benz started the Le Mans 24-hour race in June 1955 with an ingenious piece of technology in tow.
His was the engineering mind behind the space frame, made by welding together filigreed steel profiles, which supported the engine, transmission and axles.

Road Tests Real world tests of the Mercedes-Benz 300 SLR

Top speed

Mercedes-Benz 300 SLR
186 mph
253 mph
Mustang GT 5.0
151 mph

Data points Key details of the Mercedes-Benz 300 SLR

Number built

Mercedes-Benz 300 SLR
2 cars
300 cars


Mercedes-Benz 300 SLR
310 HP
987 HP

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Mercedes-Benz 300 SLR
The hugely powerful engine was mounted longitudinally in the front section of the car at an angle of 33 degrees and supplied with a high-octane fuel mixture of low-lead petrol (65 percent) and benzol (35 percent).
In the immediate post-war period Uhlenhaut, who had previously played a major role in the success of the Silver Arrows between 1937 and 1939, designed a series of smaller racing cars with rear-mounted engines in which he incorporated a wide tubular frame, the central section of which formed a high-strength triangular construction in front of the cockpit.

Specifications Full list of technical specs


Brand Mercedes-Benz
Year 1955
Number built 2 cars

power & handling

Power-to-weight ratio 6.4 lb/hp
Maximum hp 310 HP @ 7,400 RPM
Maximum torque 233 ft-lb @ 5,950 RPM
Max RPM 7,800 RPM
Steering system Rack and pinion


Displacement 2,982 cc
Air compressor None
Fuels Gas
Compression ratio 9:1
Bore/stroke 3.07 in / 3.07 in
Valvetrain DOHC
Valves per cylinder 2 valves

road tests

Top speed 186 mph


Drivetrain RWD
Gearing Traditional
# of gears 5 gears
Gear ratios
  1. 1: 2.67:1
  2. 2: 1.75:1
  3. 3: 1.43:1
  4. 4: 1.07:1
  5. 5: 0.83:1
Axle ratio 2.22:1

suspension, wheels & brakes

Front brakes Disc
Rear brakes Disc

physical dimensions

Curb weight 1,984 lb
Width 68.5 in
Height 43.3 in
Length 169.3 in
Front track width 52.4 in
Wheelbase 93.3 in
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