What Are Studded Winter Tires? | Ice Traction Basics

If you live where roads regularly turn into glare ice or hard-packed snow, you have probably heard about studded winter tires. These specialized tires swap some of the quiet ride of a standard winter tire for a mechanical bite on ice. They are not the right choice for every driver or every winter road, but on the surfaces they are built for, nothing else grips quite the same way.

How Studded Tires Actually Work

A studded winter tire does two things at once. The rubber compound stays flexible in freezing temperatures, which is what any winter tire does. The difference is the studs. Each stud—typically made from tungsten carbide or another hardened metal—protrudes a tiny amount from the tread, usually around 1/32 to 1/16 of an inch depending on the design. When the tire rolls over ice, the studs concentrate the car’s weight at small contact points, penetrate the thin water film that makes ice slippery, and create a physical grip that rubber alone cannot match. This improves starting, stopping, braking, and cornering on icy roads. Older technical research from the Highway Research Board documented these mechanics as early as the 1960s, and the basic physics has not changed since.

Studded vs. Studdable vs. Studless Tires

Not every winter tire falls into the same category, and mixing up the terms leads to the wrong purchase. Studded winter tires arrive from the factory with the studs already installed. Studdable winter tires are built with pre-drilled divots or holes in the tread so studs can be inserted later using a pressure gun tool; the rubber holds them in place once installed. Studless winter tires, which are far more common on cars today, rely entirely on a soft rubber compound, deep tread blocks, and thin slits called sipes to grip snow and ice without any metal components. The key distinction is straightforward: only studded and studdable tires use metal pins, and a studdable tire becomes a studded tire the moment the pins go in.

Where Studded Tires Shine—and Where They Fall Short

The advantage of studded tires exists primarily one place: on ice and hard-packed snow. On glare ice, the difference between studded and studless can be dramatic. On bare pavement, however, studs reduce traction and increase road noise, and they can accelerate wear on the road surface itself. The trade-off is a real one: studs help most where conditions are worst, and help least—or actively hurt—on dry roads. Because of these trade-offs, studded winter tires are not universally legal. Laws vary by state and sometimes by local jurisdiction, with some areas restricting use to specific calendar months or only on roads that are officially snow- or ice-covered. The Washington State Department of Transportation’s technical research has noted both the traction benefits and the wear concerns over many years.

What To Know Before Buying

Before choosing studded tires over studless ones, a few practical checks matter. Studded tires require enough tread depth to accommodate the studs, which can limit tire size options compared to all-purpose winter tires. If you opt for studdable tires, you will also need the correct tool to install the studs properly. And because studded tires are a niche category, most drivers who deal with frequent ice are best served by checking a dedicated product roundup to compare current models and prices. For a side-by-side look at the top options available right now, our tested picks for the best studded winter tires breaks down the features that matter most. A typical tire carries roughly 80 to 100 studs, though counts vary with tire size and stud pattern.

Even the best studded tire is only the right tool for specific conditions. If your winter driving is mostly on plowed roads or in moderate snow, a quality studless winter tire will likely serve you better with less noise and fewer legal restrictions. If you regularly drive on ice where stopping distance matters most, studded tires are the engineering answer—just make sure they are legal where you live.