The Discoverer® S/T MAXX™ P.O.R. is designed for demanding off-road environments, while also offering on-road traction, stability and low noise characteristics. 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. Tough terrain hybrid 4-5 rib design
    Provides even wear and a low tread pattern noise.
  2. Dual-draft and non-parallel groove walls
    Help to resist against cutting and chipping.
  3. Stone ejector ribs
    Aid the discharge of debris.
Full specs

Tire specifications

There are 23 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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LT305/55 R 2030555121Q99Black SidewallN/AN/AN/AN/A
LT265/60 R 2026560121Q99Black SidewallN/AN/AN/AN/A
LT35/12.50 R 203512.50121Q99Black SidewallN/AN/AN/AN/A
LT265/60 R 1826560119Q99Black SidewallN/AN/AN/AN/A
LT315/70 R 1731570121Q99Black SidewallN/AN/AN/AN/A
LT295/70 R 1729570121Q99Black SidewallN/AN/AN/AN/A
LT285/70 R 1728570121Q99Black SidewallN/AN/AN/AN/A
LT285/75 R 1728575121Q99Black SidewallN/AN/AN/AN/A
LT275/70 R 1727570121Q99Black SidewallN/AN/AN/AN/A
LT265/65 R 1726565120Q99Black SidewallN/AN/AN/AN/A
LT265/70 R 1726570121Q99Black SidewallN/AN/AN/AN/A
LT255/75 R 1725575111Q99Black SidewallN/AN/AN/AN/A
LT255/80 R 1725580121Q99Black SidewallN/AN/AN/AN/A
LT245/70 R 1724570119Q99Black SidewallN/AN/AN/AN/A
LT245/75 R 1724575121Q99Black SidewallN/AN/AN/AN/A
LT235/80 R 1723580120Q99Black SidewallN/AN/AN/AN/A
LT265/70 R 1626570121Q99Black SidewallN/AN/AN/AN/A
LT245/70 R 1624570118Q99Black SidewallN/AN/AN/AN/A
LT245/75 R 1624575120Q99Black SidewallN/AN/AN/AN/A
LT235/85 R 1623585120Q99Black SidewallN/AN/AN/AN/A
LT225/75 R 1622575115Q99Black SidewallN/AN/AN/AN/A
LT31/10.50 R 153110.50109Q99Black SidewallN/AN/AN/AN/A
LT30/9.50 R 15309.50104Q99Black SidewallN/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