A 40 series tire has a sidewall height equal to 40% of its tread width — a low-profile configuration found on sport sedans, performance coupes, and higher-spec trims of popular models. Common vehicles using 40-series fitments include the Honda Civic Si, Volkswagen Golf GTI (some trims), Ford Focus ST, Mazda3 Turbo, Subaru WRX, and a range of BMW, Audi, and Mercedes entry-level models.

Low-profile tires like the 40 series offer sharper steering response and better lateral stability than higher-profile options. The tire’s footprint stays firmly planted through corners, and the reduced sidewall flex provides better feedback and more direct handling. The trade-off is a somewhat firmer ride over imperfections — common 40-series fitments like 245/40R18 and 255/40R19 are tuned for driver feel over comfort.

For Alberta drivers, 40-series winter tires are the right call for performance vehicles in winter. The cold-weather compound and tread design of a dedicated winter tire outperform any all-season at low temperatures regardless of profile — stopping distances on snow and ice are dramatically different. Running an appropriate winter fitment in 40-series is straightforward and widely available.

Canada Tire Pro carries 40-series tires across popular fitments. Same-day fitting is available at our Calgary and Edmonton locations.