Why Winter Tire Tread Matters

Winter driving in Canada is unpredictable with icy highways, heavy snowfall, and slushy city streets. Winter tires are essential for safe driving from late fall to early spring, but even the best winter tires lose their effectiveness if the tread is too worn.

When the tread wears down:

• Stopping distances increase

• Traction on snow and ice decreases

• Hydroplaning risk goes up

In short, less tread means less safety.

Step 1: Check the Tread Depth

In Canada, the legal minimum tread depth for winter tires is 1.6 mm, but safety experts recommend replacing them when they reach 4 mm.

Two easy ways to measure:

1. The Tire Tread Gauge

A simple, inexpensive tool that gives an exact measurement in millimetres.

2. The Toonie Test

• Insert a Canadian toonie into the tread with the bear’s paw facing down.

• If the tread covers the outer silver of the coin, your tires are in good condition.

• If it only covers part of the paw, your tread is getting low.

• If the tread doesn’t reach the paw at all, it’s time for new tires.

Step 2: Look for the Snowflake Symbol

Winter tires in Canada must have the Three-Peak Mountain Snowflake (3PMSF) symbol. This ensures they meet minimum traction standards for severe winter conditions. If your tires don’t have it, they may not perform well on snow and ice.

Step 3: Inspect for Uneven Wear

Even with plenty of tread depth, uneven wear can compromise safety. Check for:

• Bald spots

• More wear on one side of the tire

• Cracks or bulges

These can indicate alignment issues or other mechanical problems that should be addressed.

Step 4: Replace When Needed

If your tread is below 4 mm, consider replacing your winter tires before the snow season is in full swing. Fresh tread can mean the difference between stopping safely and sliding into trouble.

Stay Safe This Winter with Donnelly Kia

At Donnelly Kia, we can measure your tread depth, inspect for wear, and recommend the best winter tires for your Kia. Book your winter tire inspection today and drive with confidence all season long.