The Discoverer® AT3 4S™, featuring Adaptive-Traction Technology™, will help your vehicle grip the surface, whether it is rocky or smooth, and in the most severe weather, whether it is hot or cold, wet or dry.
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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. Snow groove technology
    Patented saw-tooth technology traps snow in the tread to provide snow-on-snow traction.
  2. Secure-grip™ all-terrain design
    Specifically designed 5-rib all-terrain pattern provides greater off-road driving capability and improved wet/dry traction.
  3. Micro-gauge™ zigzag sipes
    Gauge sipes in all tread blocks provide vehicle stability, as well as reducing stone retention, while zig zags create more biting edges.
Full specs

Tire specifications

There are 19 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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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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285/45 R 22 XL28545114H210DC75
275/45 R 22 XL27545112H210DC73
265/50 R 20 XL26550111T190DC75
255/50 R 20 XL25550109H210DC73
265/65 R 1826565114T190N/AN/AN/AN/A
265/70 R 1826570116T190DC73
265/70 R 1826570116T190N/AN/AN/AN/A
255/70 R 1825570113T190DC73
P285/70 R 1728570117T190DC75
255/70 R 1725570112T190Outlined White LetteringDC73
255/75 R 1725575115T190Outlined White LetteringDC73
235/60 R 1723560102T190DC72
235/75 R 1723575109T190Outlined White LetteringDC72
225/65 R 1722565102H210DC72
215/65 R 172156599T190Outlined White LetteringDC72
245/75 R 1624575111T190DC72
235/70 R 1623570106T190N/AN/AN/AN/A
235/75 R 1623575108T190Outlined White LetteringDC72
265/75 R 1526575112T190Outlined White LetteringDC73
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