All Weather Tire Size

 In most regions with a winter tire mandate, yes -  those laws are typically written around the M+S or 3PMSF symbol rather than the words "winter tire," and all-weather tires carry that 3PMSF rating. Quebec's mandatory winter tire law is a common example: it accepts either symbol, so an all-weather tire satisfies it. The exact wording isn't identical everywhere, so it's worth a quick check for your own province or state before relying on it.

 No -  that's the core appeal of the category. All-weather tires are built to stay on the vehicle year-round while still carrying the 3PMSF snow-traction certification that would otherwise mean swapping twice a year.

They can. The rubber compound that keeps all-weather tires flexible in cold weather is softer than a standard warm-climate compound, so it wears faster in sustained heat -  in a climate with no real winter at all, a dedicated summer or all-season tire will usually outlast it, worth factoring in if you're buying for convenience rather than necessity.

 Not fully. The certification reflects performance at full tread depth. As the tread wears, snow and ice traction decreases the same way it would on any tire -  even though the symbol stays molded on the sidewall long after the performance it represents has faded. If your current set is past half tread depth heading into winter, that's worth weighing now rather than waiting.

Check the sidewall for the Three-Peak Mountain Snowflake (3PMSF) symbol. All-weather tires carry it; standard all-season tires generally carry only the M+S marking without it -  and since the two categories often use similar-sounding product names, the symbol is the only reliable way to tell which one you're actually buying.

Use the size selector on our homepage if you already know your size, or the VIN lookup tool to confirm it from your vehicle. Since all-weather tires are meant to stay on year-round, double-check the size against both your summer and winter use case if you've previously run different sizes seasonally -  you're now committing to one size for the whole year.

 Load index, speed rating, and how the manufacturer balances winter versus all-season performance in the compound all move the price within a size -  a tire leaning harder into winter capability typically costs more than one treating the 3PMSF rating as a minimum bar to clear. Check the spec line on each listing rather than assuming the priciest option is automatically the most winter-capable.