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In the UK, tyres are legally required to have a minimum tread depth of 1.6mm. Many manufacturers integrate a tread wear indicator into the tyre, which becomes visible as the tread depth approaches the minimum. However, for enhanced safety and performance, it is advisable to replace tyres once the tread depth falls below 2.5mm.
The tyre size is prominently displayed on the sidewall of each tyre and provides vital information about its specifications, including width, profile, wheel size, speed rating, and load index.
Example: 185/50R14 82R
185 - This number represents the nominal section width of the tyre, in millimetres. For this tyre, it's 185mm.
50 - This is the profile height, also known as the aspect ratio. It’s calculated as a percentage of the tyre width, indicating that the height of this tyre is 50% of its width.
R - This letter indicates that the tyre has a radial construction, the most common tyre type in the UK. Other types include cross ply and bias belted.
14 - This number indicates the diameter of the wheel that the tyre fits, measured in inches.
82 - This is the load index, which shows the maximum load that the tyre is designed to carry. Always replace tyres with those that match or exceed this value, as recommended by your vehicle's manufacturer.
R - This letter is the speed rating. It represents the maximum speed at which the tyre can safely operate while fully loaded. Like the load index, ensure replacement tyres meet or exceed this rating to maintain vehicle safety and performance.
All tyres fitted in the UK must be capable of meeting or exceeding the legal speed limits.
Maintaining the correct tyre pressure is crucial for maximising tyre effectiveness and lifespan. Tyres should always be inflated according to the vehicle manufacturer’s specifications. You can easily check tyre pressures using a gauge, which is available at most car accessory shops, or by visiting your local garage. Modern pumps allow you to precisely inflate or deflate tyres to the specified pressure.
Under-inflation can significantly reduce tyre lifespan. For instance, if tyre pressure falls to 80% of the recommended level, the tyre’s lifespan may decrease to only 75%. If it drops further to 60%, the lifespan can plummet to less than 40%. It’s also wise to regularly check for uneven tyre wear, which is a common sign of incorrect tyre pressure.
Conversely, over-inflating tyres can decrease their grip because less of the tyre surface makes contact with the road, which in turn can lead to uneven tyre wear.
Maintaining the right tyre pressure isn't just about longevity; it also enhances fuel efficiency, ensuring your vehicle runs optimally.
While these products can provide a temporary fix to get you moving quickly, driving on a punctured tyre can almost inevitably lead to irreparable damage.