Milder winters and moderate weather in many regions are leading more drivers to choose all-season tyres. They avoid seasonal tyre changes and the costs that come with them, making them particularly popular with city residents and motorists who cover relatively short distances.
Summer tyres are designed for warm temperatures and favourable road conditions. Their rubber compound is intended to retain its properties in the heat, while the tread supports safe manoeuvring. As temperatures fall, summer rubber stiffens and loses flexibility and grip, reducing safety. Winter tyres have tread designed to bite into snow and maintain traction on slippery roads; their compound is formulated to work in low temperatures and support braking and stability. Motoring publications cite about 7°C as a rule-of-thumb point for changing from summer to winter tyres.
All-season tyres combine selected features of summer and winter designs. Their construction and rubber compound are intended to work across a wider temperature range, but that flexibility involves trade-offs. The limits are most apparent in deep snow and very low temperatures, where winter tyres remain more effective. All-season models are better suited to moderate climates where snow and ice are rare and roads are regularly cleared. The article says they are a less suitable choice for frequent trips to mountains or remote areas with less-maintained roads.
Motoring publications describe all-season tyres as a possible fit for drivers covering up to roughly 10,000 kilometres per year, mostly in town. For annual distances above 10,000–15,000 kilometres, a dynamic driving style or frequent travel in difficult conditions, two separate sets—summer and winter—are presented as the better option. All-season tyres wear faster under intensive use.
Using one set can reduce the cost of buying tyres and paying for seasonal changes, and removes the need to store a second set. Drivers without a garage or cellar may otherwise have to pay for storage. The article also says all-season tyres are best suited to low- and medium-powered cars, at around 150–170 horsepower or less; seasonal tyres are recommended for more powerful or sporty vehicles. Buyers are advised to compare specifications and test results because the quality and performance of individual models can differ substantially.