The Discoverer® STT PRO™ P.O.R. is our premium tyre for the most extreme off-road applications. It is used by Xavier Foj in the Dakar Rally, one of the toughest challenges in world motorsport. Made in the USA.
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Dry performance
The tire's ability to grip the road in dry conditions.
Wet performance
The tire's ability to grip the road in wet conditions.
Tread wear
The wear rate of the tire.
Quiet ride
The measure of how quiet a tire is while driving.
How the tire is able to respond to driving such as accelerating, braking, steering and turning.
Off road
The tire's ability to have grip on unpaved surfaces such as dirt, mud, sand, rock or gravel.
*When compared to other Cooper® tires


  1. Armor Tek3® construction
    Offers added durability and resistance against punctures.
  2. Alternating shoulder lugs
    Enhance traction in muddy conditions and on soft surfaces.
  3. Unique hybrid 3-2 tread pattern
    Increases stability and reduces noise.
Full specs

Tire specifications

There are 31 tire sizes available
More Information?
Tire size
The tire size is made up of: Tread Width / Aspect Ratio / Rim Diameter. For example 245/50R18
The tire width is a millimetre measurement for the width of the tire. For example 245 mm when reading a tire size of 245/50R18
Aspect ratio
The aspect ratio is the percentage of the height of the sidewall compared to the tread width. For example 50% when reading a tire size of 245/50R18
The maximum load a tire can carry is defined as a ‘Load Index’. Please refer to https://www.coopertire.co.uk/tire-safety-tips/correct-loading/
Speed rating
The Speed Symbol is shown as a letter and indicates the maximum speed. Please refer to https://www.coopertire.co.uk/tire-safety-tips/correct-loading
Max speed
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Rolling Resistance
Rolling Resistance
5 classes from E (least efficient) to A (most efficient)
Effect may vary among vehicles and driving conditions, but the difference between a E and an A class for a complete set of tyres could reduce fuel consumption by up to 7.5 %* and even more in case of trucks. Fuel savings and road safety depend heavily on the behavior of drivers and eco‐driving can significantly reduce fuel consumption.
Wet grip
Wet Grip
5 classes from E (longest braking distances) to A (shortest braking distances)
Effect may vary among vehicles and driving conditions, but in the case of full braking, the difference between a E and an A class for a set of four identical tyres could be up to 30% shorter braking distance (e.g. for a typical passenger car driving at 80 km/h speed this could be up to 18m shorter braking distance)*. Stopping distances must always be respected.”
Noise level
Noise Level
In addition to the noise value in Decibel dB(A) a letter (from A to C) displays whether the tyre external rolling noise performance is above the United Nation Reg 117 mandatory limit value
(Class C = noisier tyre), the tyre noise is higher than the UN limit
(Class B = average tyre) or more than 3 dB below the limit value
(Class A = low noise tyre).
NB: The tyre external rolling noise is not entirely correlated to vehicle interior noise.
EU label
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LT35/12.50 R 223512.50117Q160Black SidewallN/AN/AN/AN/A
LT305/55 R 2030555121Q160Black SidewallN/AN/AN/AN/A
LT295/65 R 2029565129K110Black SidewallN/AN/AN/AN/A
LT275/65 R 2027565121Q160Black SidewallN/AN/AN/AN/A
LT35/12.50 R 203512.50121Q160Black SidewallN/AN/AN/AN/A
LT305/60 R 1830560121Q160Raised White LetteringN/AN/AN/AN/A
LT305/70 R 1830570126K110Raised White LetteringN/AN/AN/AN/A
LT275/65 R 1827565123K110Raised White LetteringN/AN/AN/AN/A
LT275/70 R 1827570125K110Raised White LetteringN/AN/AN/AN/A
LT37/13.50 R 183713.50124K110Black SidewallN/AN/AN/AN/A
LT315/70 R 1731570121Q160Raised White LetteringN/AN/AN/AN/A
LT305/65 R 1730565121Q160Black SidewallN/AN/AN/AN/A
LT295/70 R 1729570121Q160Raised White LetteringN/AN/AN/AN/A
LT285/70 R 1728570121Q160Raised White LetteringN/AN/AN/AN/A
LT265/70 R 1726570121Q160Raised White LetteringN/AN/AN/AN/A
LT255/75 R 1725575111Q160Raised White LetteringN/AN/AN/AN/A
LT40/13.50 R 174013.50121Q160Black SidewallN/AN/AN/AN/A
LT37/12.50 R 173712.50124K110Black SidewallN/AN/AN/AN/A
LT37/13.50 R 173713.50121Q160Black SidewallN/AN/AN/AN/A
LT315/75 R 1631575127K110Raised White LetteringN/AN/AN/AN/A
LT305/70 R 1630570124K110Raised White LetteringN/AN/AN/AN/A
LT285/75 R 1628575126K110Raised White LetteringN/AN/AN/AN/A
LT265/75 R 1626575123K110Raised White LetteringN/AN/AN/AN/A
LT245/75 R 1624575120Q160Black SidewallN/AN/AN/AN/A
LT235/85 R 1623585120Q160Black SidewallN/AN/AN/AN/A
LT215/85 R 1621585115Q160Black SidewallN/AN/AN/AN/A
LT35/12.50 R 153512.50113Q160Raised White LetteringN/AN/AN/AN/A
LT33/12.50 R 153312.50108Q160Raised White LetteringN/AN/AN/AN/A
LT32/11.50 R 153211.50113Q160Raised White LetteringN/AN/AN/AN/A
LT31/10.50 R 153110.50109Q160Raised White LetteringN/AN/AN/AN/A
LT30/9.50 R 15309.50104Q160Raised White LetteringN/AN/AN/AN/A
Tire care

Tire care

Tire inspection
Keep an eye out for potential problems that might affect your tires.
What is the EU label on a tire and can I use it?
Driving on any tire that does not have the correct inflation pressure is dangerous.
Tire safety tips
How to get the most out of your tires.
Speak to an expert