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 29 tire sizes available
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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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Roll resistance
Rolling Resistance is the main key factor in measuring the energy efficiency of a tire and has direct influence on the fuel consumption of a vehicle. A set of tires of the green class “A” compared to a “G” class can reduce fuel consumption by 7.5% of a passenger car; even more for trucks.
Wet grip
Basis for wet grip is the absolute stopping distance when driving 80km per hour. Between each class, there are 3-6 metres difference in braking distance.
Noise level
The drive by noise is quoted as an absolute value in decibel and as a 3 classes sound wave symbol.
EU label
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LT305/55R2030555121Q160Black SidewallN/AN/AN/AN/A
LT295/65R2029565129K110Black SidewallCB69
LT275/65R2027565121Q160Black SidewallCB68
35X12.50R20LTN/AN/A121Q160Black SidewallN/AN/AN/AN/A
LT305/60R183056121Q160Raised White LetteringDC73
LT305/70R183057126K110Raised White LetteringDB68
LT275/70R182757125K110Raised White LetteringCB69
LT275/65R1827565123K110Raised White LetteringBB69
37X13.50R18LTN/AN/A124K110Black SidewallCB68
LT315/70R173157121Q160Raised White LetteringN/AN/AN/AN/A
LT305/65R1730565121Q160Black SidewallN/AN/AN/AN/A
LT295/70R172957121Q160Raised White LetteringDC73
LT285/70R172857121Q160Raised White LetteringN/AN/AN/AN/A
LT265/70R172657121Q160Raised White LetteringN/AN/AN/AN/A
37X12.50R17LTN/AN/A124K110Black SidewallCB69
37X13.50R17LTN/AN/A121Q160Black SidewallCA70
40X13.50R17LTN/AN/A121Q160Black SidewallCB68
LT315/75R1631575127K110Raised White LetteringCB68
LT305/70R163057124K110Raised White LetteringBB69
LT285/75R1628575126K110Raised White LetteringCC72
LT265/75R1626575123K110Raised White LetteringDB68
LT245/75R1624575120Q160Black SidewallDA70
LT235/85R1623585120Q160Black SidewallN/AN/AN/AN/A
LT215/85R1621585115Q160Black SidewallN/AN/AN/AN/A
35X12.50R15LTN/AN/A113Q160Raised White LetteringCC72
32X11.50R15LTN/AN/A113Q160Raised White LetteringN/AN/AN/AN/A
31X10.50R15LTN/AN/A109Q160Raised White LetteringDA70
33X12.50R15LTN/AN/A108Q160Raised White LetteringN/AN/AN/AN/A
30X9.50R15LTN/AN/A104Q160Raised 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