Tire chains go on before you need them, not during a blizzard
Tire chains attach to your tires to grip snow and ice when regular tread cannot. You thread the chain around the tire, connect the ends, and tighten it so the chain sits snug against the rubber. The whole process takes 10 to 15 minutes per tire once you know the steps, but it is much harder in cold, wet conditions, so practice at home first.
Chains are not legal everywhere — some states and mountain passes forbid them, while others require them during certain weather. Check your state's transportation department website and the specific road rules before you buy. If chains are permitted where you drive, having them in your vehicle during winter is a practical backup when conditions worsen.
Key Takeaways
- Tire chains must match your tire size, which you can find on the sidewall of your tire or in your vehicle's manual.
- You install chains on the drive wheels — the front wheels on front-wheel-drive cars, the rear wheels on rear-wheel-drive cars, or all four on all-wheel-drive vehicles.
- The chain wraps around the tire, and you connect the ends with hooks or clasps, then tighten the side and center straps until the chain is snug but not cutting into the rubber.
- Practice putting chains on at home in daylight and dry conditions so you know how they work before you attempt it in a snowstorm.
- After driving a short distance, stop and retighten the chains, because they loosen as the tire flexes.
Choosing the right chain size for your tires
Tire chains come in sizes that match specific tire widths and diameters. Look at the sidewall of your tire — you will see a code like 225/65R17. The first number (225) is the width in millimeters. The chain package will list which tire sizes it fits, so match that code to the box.
If you are unsure, your vehicle's owner manual lists the tire size, or you can ask a tire shop. Buying chains that are too large will not grip properly and may damage your wheel. Chains that are too small will not fit around the tire at all. Many chain manufacturers offer a sizing tool on their website where you enter your tire code and it shows you which chains work.
Installing chains on your drive wheels
Before you start, park on level ground away from traffic. Lay the chain out flat on the ground and check that it is not tangled. Identify which wheels need chains — on front-wheel-drive cars, that is the front two wheels; on rear-wheel-drive cars, the rear two; on all-wheel-drive, all four (though some people chain only the rear pair if they are in a pinch).
Drape the chain over the top of the tire so it hangs evenly on both sides. The chain should sit in the center of the tire tread, not touching the sidewall or the wheel rim. Pull the bottom ends of the chain under the tire and connect them using the hooks or clasps provided — usually you hook one end through a link on the other end and find it with a pin or clasp. Do not force it; if the chain does not reach, you have the wrong size.
Once the ends are connected, tighten the side straps (the ones running along the sides of the tire) first, then the center strap that runs across the middle of the tread. Tighten until the chain is snug against the tire but not so tight that it digs into the rubber or restricts the tire from turning. You should be able to fit one finger between the chain and the tire.
Checking your work before driving
Spin the tire by hand to make sure the chain moves freely and does not rub against the wheel well, brake line, or suspension. If it catches, loosen the chain slightly or reposition it so it sits more centered on the tire. Drive slowly — no more than 25 to 30 miles per hour — for the first quarter mile, then pull over and check the chains again.
Chains loosen as the tire flexes under your weight, so retightening after a short drive is normal and necessary. If the chain is loose after that first check, tighten the straps again. After that, check every 30 minutes of driving or whenever you stop for any reason. A loose chain can slip off, damage your vehicle, or fail to grip when you need it most.
Removing chains safely
Once you reach clear pavement or conditions improve, remove the chains as soon as it is safe to do so. Driving on bare pavement with chains on wears them out quickly and can damage the road surface. Park in a safe spot, release the center strap first, then the side straps, then disconnect the ends of the chain.
Pull the chain out from under the tire carefully — it will be cold and wet. Lay it flat to dry before storing it, or it will rust. Coil it loosely and store it in a dry place in your vehicle or at home. Do not leave chains on a tire for more than a few miles of pavement driving.
Common mistakes that make chains fail
The most common error is buying the wrong size. Chains that are too loose slip off; chains that are too tight can break or damage the tire. The second mistake is not retightening after the first short drive — chains need a second tightening once the tire has flexed under load.
A third mistake is installing chains on the wrong wheels. If your car is front-wheel-drive and you put chains on the rear, they will not help you steer or accelerate in snow. A fourth is driving too fast. Chains are designed for low-speed traction in deep snow, not highway speeds. Driving faster than 30 miles per hour with chains on can break them or damage your suspension.
Finally, do not leave chains on after the road clears. Pavement wears chains out and they lose their grip. Chains are a temporary tool for severe conditions, not a permanent winter tire replacement.
Alternatives if chains are not practical for you
If you live in a climate with frequent snow, winter tires are a better long-term choice than chains. Winter tires have deeper tread and softer rubber that grips cold pavement better than all-season tires, and you do not have to install them in an emergency. They cost more upfront but last through a full season.
Some states and mountain passes allow cable chains or friction devices instead of traditional chains. Cable chains are lighter and easier to install but wear out faster. Friction devices like traction mats or sand are temporary fixes for getting unstuck, not for driving in snow. Check your local regulations to see what is permitted on the roads you use.
Frequently Asked Questions
Do I need chains on all four tires?
On front-wheel-drive cars, chains on the front two wheels are enough. On rear-wheel-drive cars, chains on the rear two wheels provide traction. On all-wheel-drive vehicles, chains on all four wheels give the best grip, but some people chain only the rear pair if budget or storage is tight. Check your vehicle's manual for the manufacturer's recommendation.
Can I drive on the highway with chains on?
No. Most states restrict chains to mountain passes and secondary roads, and many highways ban them entirely. Even where they are permitted, chains are designed for speeds under 30 miles per hour. Driving faster damages the chains and can harm your vehicle's suspension. Check the specific road's rules before you head out.
What if the chain breaks while I am driving?
Pull over to a safe spot when ready and remove the broken chain. Do not continue driving with a broken chain — it can wrap around the axle or brake line and cause serious damage. If you are on a highway or in heavy traffic, turn on your hazard lights and move to the shoulder. Call for a tow if you cannot safely remove it yourself.
How tight should chains be?
Tight enough that they do not slip, but not so tight that they cut into the tire or prevent it from turning. A good test is to fit one finger between the chain and the tire. If you cannot fit your finger, loosen it slightly. If the chain is loose enough to rattle, tighten it more. Retighten after your first quarter mile of driving.
Can I leave chains on overnight?
Yes, if you are parked and not driving. Chains left on a parked tire do not cause damage. However, if you are driving on pavement, remove them as soon as conditions allow. Pavement wears chains out quickly and they lose their grip. Chains are meant for snow and ice, not bare roads.