By using this website you consent to our terms of service and cookies policy. We use cookies on this site to ensure the best service possible.
Read more
By using this website you consent to our terms of service and cookies policy. We use cookies on this site to ensure the best service possible.
Read more
Three-peak mountain snowflake


The Discoverer AT3 4S™ with Adaptive-Traction Technology™ grips the surface, rocky or smooth, under the most severe weather, hot or cold, wet or dry.
Show available sizes
Find a store
Click to enlarge
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 superior 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
    Smaller gauge sipes in all tread blocks provide increased vehicle stability and control, while reducing stone retention and drilling. Zigzags create more biting edges for optimal wet/dry traction.
Full specs

Tire specifications

There are 20 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
Speed rating
The Speed Symbol is shown as a letter and indicates the maximum speed. Please refer to
Max speed
(cannot find text: coopertires_sites:site.tooltips.max_speed)
(cannot find text: coopertires_sites:site.tooltips.sidewall)
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
(cannot find text: coopertires_sites:site.tooltips.eu_label)
285/45 R 22 XL28545114H210EC75
275/45 R 22 XL27545112H210EC73
265/50 R 20 XL26550111T190Outlined White LetteringEC73
255/50 R 20 XL25550109H210EC73
265/70 R 1826570116T190Outlined White LetteringEC72
255/70 R 1825570113T190Outlined White LetteringEC72
P285/70 R 1728570117T190Outlined White LetteringEC74
265/70 R 1726570115T190Outlined White LetteringEC72
255/70 R 1725570112T190Outlined White LetteringEC72
255/75 R 1725575115T190Outlined White LetteringEC72
235/60 R 1723560102T190Outlined White LetteringEC71
235/75 R 1723575109T190Outlined White LetteringEC71
225/65 R 1722565102H210EC71
215/65 R 172156599T190Outlined White LetteringEC71
255/70 R 1625570111T190Outlined White LetteringEC72
245/70 R 16 XL24570111T190Outlined White LetteringEC72
245/75 R 1624575111T190Outlined White LetteringEC71
235/75 R 1623575108T190Outlined White LetteringEC71
265/70 R 1526570112T190Outlined White LetteringEC72
265/75 R 1526575112T190Outlined White LetteringEC72
Tire care

Tire care

Tire inspection
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
Tire safety tips
How to get the most out of your tires.
Speak to an expert