How to Change a Flat Tire: A Safe, Step-by-Step Guide

A flat tire is one of the few roadside problems you can fix yourself in about 20 minutes — if you know the steps and stay safe. The biggest risks are not the tire but traffic and an improperly supported car. This guide shows you how to do it right, in the correct order, with safety front and center.

Every driver should know how to change a tire, because a flat can happen anywhere a tow truck is far away. The mechanical part is straightforward; the part that protects you is choosing a safe spot and never trusting a jack with your body. According to NHTSA roadside-safety guidance, the most dangerous moment of a tire change is standing near moving traffic, so location matters more than speed.

Before you start: find a safe spot

• Pull onto a level, firm surface well away from traffic — never on soft ground or a slope.
• Turn on your hazard lights and apply the parking brake firmly.
• Put the transmission in Park (automatic) or in gear (manual).
• Place wheel chocks, rocks or bricks against the tires diagonally opposite the flat.

What you'll need

• The spare tire (check its pressure periodically so it's ready)
• The jack supplied with your car
• A lug wrench (and a wheel-lock key if your car has locking lugs)
• The owner's manual, to locate the jack points
• Gloves, a flashlight and a reflective triangle or flares if you have them

Step-by-step tire change

1. Loosen the lug nuts first

Before lifting the car, break each lug nut loose about a quarter turn using the lug wrench — turn counterclockwise. Do this now, while the tire is still on the ground, because once the wheel is in the air it will spin instead of loosening. If they're stiff, push down on the wrench with your foot, using your body weight rather than yanking.

2. Position the jack and lift

Place the jack only at the reinforced jack point near the flat tire — your manual shows exactly where. Lifting at the wrong spot can dent the floor pan or let the car slip off. Raise the car until the flat tire is about six inches off the ground.

3. Remove the nuts and the flat

Fully unscrew the loosened lug nuts and keep them together — drop them in your pocket or a cup, not on the ground where they roll away. Pull the flat tire straight toward you and set it flat on the ground so it can't roll into traffic.

4. Mount the spare

Lift the spare onto the hub and line up the bolt holes. Push it on, then thread the lug nuts on by hand as far as they'll go. Hand-tightening first prevents cross-threading.

5. Tighten in a star pattern

Snug the nuts in a crisscross (star) pattern rather than going around the circle — this seats the wheel evenly against the hub. Tighten them firmly by hand while the car is still raised, but do the final tightening on the ground.

6. Lower the car and torque properly

Lower the jack until the tire bears the car's weight, then fully tighten the lug nuts in the same star pattern. If you have a torque wrench, tighten to the value in your manual; if not, make them firm and have them torqued correctly at the first opportunity.

7. Stow everything and check pressure

Put the flat tire, jack and tools back where they belong. Check the spare's pressure if you can, and get the flat repaired or replaced promptly.

Know your spare's limits

After the change: re-torque the lug nuts

Lug nuts can settle after a wheel is first installed, so it's good practice to re-check the torque after about 50 to 100 miles of driving. A quick check with a torque wrench prevents the rare but dangerous possibility of a wheel working loose.

If you can't or shouldn't do it yourself

There's no shame in calling for help. On a high-speed highway with a narrow shoulder, a fast-moving lane just feet away makes a DIY change genuinely hazardous. Roadside assistance, included with many insurance policies and car warranties, exists for exactly this situation.

Frequently asked questions

Why loosen the lug nuts before jacking the car up?

If you lift the car first, the wheel spins freely and you can't get enough leverage to break the nuts loose. Loosening them about a quarter turn while the tire is still firmly on the ground lets you apply force without the wheel turning. You then finish removing them once the car is raised.

How far and how fast can I drive on a donut spare?

Compact temporary spares are usually rated for about 50 mph and roughly 50 to 70 miles, but always check the limit printed on the spare's sidewall. They have less traction and can affect handling and braking, so drive gently and get your full-size tire repaired or replaced as soon as possible.

Why tighten lug nuts in a star pattern?

Tightening in a crisscross (star) pattern pulls the wheel evenly onto the hub, preventing warping and ensuring the wheel sits flush. Tightening nuts one after another around the circle can seat the wheel unevenly. Always do the final tightening with the car's weight on the ground.

Should I re-check the lug nuts after changing a tire?

Yes. It is good practice to re-torque the lug nuts after about 50 to 100 miles, because they can settle slightly once the wheel has been driven. A quick check with a torque wrench is cheap insurance against the rare possibility of a wheel coming loose.