Tires

The weeks before winter are a good time to take a closer look at your tires, since cold, wet roads ask more of them than almost any other time of year. Knowing how to tell when you need new tires can help you decide whether your current set will carry you through the season or whether it’s worth replacing them before the first cold snap. Most of these checks take just a few minutes in the driveway, and none of them require special tools.

Sign 1: Your Tread Is Getting Shallow

Tread channels move water, slush, and snow out from under the tire, so as the tread wears down, grip gradually drops, especially on wet or snowy roads. Tires have small wear bars molded into the grooves that sit about 1.6 mm below the surface, and once the tread is level with them the tire is considered worn out. Traction in winter conditions starts to fade well before that point, though, and many tire professionals suggest replacing winter tires once they’re down to roughly 4 mm.

A simple way to check at home is the toonie test. Place a toonie in a tread groove and if the tread covers the silver outer ring of the coin, you have about 4 mm or more remaining. If you can see the whole ring, the tread is wearing thin. A tread depth gauge is inexpensive and gives you an exact reading if you’d like one.

Sign 2: Cracks, Bulges, or Cuts in the Sidewall

The sidewall flexes every time the tire rolls, which makes it the part of the tire most likely to show age and damage. Fine cracks across the rubber can be a sign that it’s drying out, while a bulge or bubble usually points to internal damage from a hard impact, such as hitting a pothole or curb. Cuts and gouges are worth a look too. A bulge in particular is something to have checked by a tire shop as soon as you can, and since cold weather stiffens rubber, existing weak spots matter even more once temperatures drop.

Sign 3: Uneven Wear Across the Tread

Run your hand across the tread, and look at how the wear is spread from edge to edge. If the outer or inner edges are more worn than the centre, it can point to under-inflation or an alignment issue, while wear down the middle often suggests the tires have been over-inflated. Patchy or scalloped wear can be a clue that suspension parts need attention. It’s worth having the cause looked at when you replace the tires so the new set doesn’t wear the same way, and regular rotation helps too. Our tips for getting more life out of your tires cover the habits that help.

Sign 4: Your Tires Are Getting Older

Rubber hardens over time, even when a tire has plenty of tread left, so age is one of the signs you need new tires that’s easy to miss. You can find out how old yours are by looking for the DOT code on the sidewall, where the last four digits show the week and year the tire was made. A code ending in 3422, for example, means the 34th week of 2022. Many manufacturers suggest having tires inspected once they’re around six years old and replacing them by about ten, though your owner’s manual and tire shop can give you advice specific to your tires.

Sign 5: Vibration, Pulling, or Pressure That Won’t Hold

Sometimes the signs show up while you’re driving. A vibration at highway speeds, a steady pull to one side, or needing to top up the air more often than usual can point to a tire that’s out of balance, damaged, or slowly leaking. None of these always means you need a new tire, but they’re worth having inspected, since a quick look from a tire shop can tell you whether it’s a simple fix or time to replace.

Why It’s Worth Checking for Signs You Need New Tires Before Winter

Temperature changes how tires behave, which is part of why a set that felt fine in September can feel different in November. Once the temperature settles around 7°C, rubber begins to stiffen, as we explain in our post on the 7°C guideline for winter tires, so any wear or damage you already have tends to show up more. If you’re planning to put on a stored winter set, it’s worth running through the same checks before they go on, and our winter vs. all-season comparison can help if you’re deciding which set suits your driving.

Found Signs You Need New Tires? Making the Swap Easier

If one or more of these checks turned something up, replacing your tires doesn’t have to turn into a big weekend project. Your floor jack handles the lifting, and the Jack and Jill of All Tires takes care of the part most people find hardest: holding a 40 to 100 lb wheel steady while lining it up with the bolts. This trolley works alongside your floor jack, supporting the weight so you’re guiding the wheel into place instead of carrying it.

If you haven’t done a swap before, our beginner’s guide to changing a tire walks through each step, and the tools page lists what’s helpful to have on hand. Ready to make tire changing easy? Check out the Jack and Jill of All Tires here.

For more on tire care and safety, the Tire and Rubber Association of Canada is a helpful resource.