Three-peak mountain snowflake


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 25 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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285/45R2228545114H210Black SidewallDC73
285/45R2228545114H210Black SidewallDC73
275/45R2227545112H210Black SidewallDC72
275/55R2027555117T190Outlined White LetteringEC73
265/50R202655111T190Black SidewallDA70
255/50R202555109H210Black SidewallEC73
255/50R202555109H210Black SidewallEC73
275/65R1827565116T190Outlined White LetteringDC72
265/70R182657116T190Black SidewallDC73N/A
255/70R182557113T190Black SidewallDC73N/A
P285/70R172857117T190Black SidewallDC75N/A
255/70R172557112T190Outlined White LetteringN/AN/AN/AN/A
255/75R1725575115T190Outlined White LetteringN/AN/AN/AN/A
245/70R172457110T190Black SidewallN/AN/AN/AN/A
245/65R1724565111T190Outlined White LetteringDC72
235/75R1723575109T190Outlined White LetteringN/AN/AN/AN/A
225/65R1722565102H210Black SidewallDC73
215/65R172156599T190Outlined White LetteringDA70
265/70R162657112T190Outlined White LetteringEC73
245/75R1624575111T190Black SidewallDC72N/A
235/75R1623575108T190Outlined White LetteringDC72
215/70R162157100T190Outlined White LetteringDC72
265/75R1526575112T190Outlined White LetteringN/AN/AN/AN/A
255/70R152557108T190Outlined White LetteringDC72
235/75R1523575109T190Outlined 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