Question

What is the difference between all-season and winter tyres?

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Answer

The difference is mostly rubber compound rather than tread pattern, which is why the distinction is invisible at a glance and easy to underestimate.

Winter tyres use a softer compound that stays flexible at low temperature. Ordinary tyre rubber hardens as it cools, and hard rubber cannot conform to the road surface, so grip falls away. The commonly cited threshold is around seven degrees Celsius, below which a winter tyre grips better even on dry road. This is the point most people miss: the benefit is not limited to snow.

The tread also differs, with more sipes, meaning small slits that create biting edges, and channels designed to clear slush. But a winter tread on a summer compound performs poorly, which is why compound matters more.

All-season tyres compromise between the two. They perform adequately across a wider range and match neither specialist at its extreme. In a mild climate that rarely sees hard frost, they are a reasonable single choice. In a climate with real winters they are meaningfully worse than winter tyres when it matters most.

The marking to look for is the three-peak mountain and snowflake symbol, which indicates the tyre passed a severe snow traction test. The older mud and snow marking is self-declared and means considerably less.

Two practical points. Winter tyres wear quickly in warm weather because the soft compound is not designed for it, so leaving them on through summer costs money and reduces dry grip. And fitting them to only one axle is worse than not fitting them at all, because the resulting grip imbalance makes the car behave unpredictably.

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