A flat tire can happen anywhere, and knowing how to change one safely keeps you moving instead of stranded on the shoulder. The good news is that the process is straightforward once you understand the steps and the few safety rules that protect you from traffic and from the jack itself. This guide walks you through changing a tire from start to finish, including where to place the jack, how to tighten the lug nuts correctly, and what to do once the spare is on. With a little practice in a safe driveway, you can handle a roadside flat with confidence.
Pull Over Safely and Prepare
The moment you feel a flat, slow down gradually and look for a safe place to stop. Choose flat, level ground that is as far from moving traffic as possible. Avoid stopping on a curve, a hill, or soft ground like grass or gravel, because an unstable surface can let the jack tip while the car is raised. A paved shoulder, a parking lot, or a quiet side street is ideal. If you are on a busy highway and cannot reach a safe spot, it is often better to call for roadside assistance than to work next to fast traffic.
Once stopped, turn on your hazard lights so other drivers can see you. Engage the parking brake firmly, and if you have an automatic transmission put it in park; with a manual, leave it in gear. Set out a reflective triangle or flares behind the car if you have them. Gather your spare, jack, and lug wrench, and place a wheel wedge or a heavy rock against the tire diagonally opposite the flat to stop the car from rolling.
Loosen the Lug Nuts and Jack Up the Car
Before you lift the car, break the lug nuts loose while the tire is still on the ground. Fit the lug wrench onto each nut and turn counterclockwise. Loosening them now is much easier, because the weight of the car keeps the wheel from spinning. Loosen each nut about half a turn, but do not remove them yet. If a nut is stuck, you can carefully use your body weight or step on the wrench, keeping your footing stable.
Next, find the correct jack point. Most vehicles have a reinforced spot just behind the front wheels or in front of the rear wheels, often marked with a notch or arrow along the pinch weld under the door sill. Your owner manual shows the exact location. Placing the jack anywhere else can dent the floor or let the car slip off. Position the jack on solid ground, raise it until it meets the jack point, then lift the car until the flat tire is a few inches off the ground.
Remove the Flat and Mount the Spare
With the car raised, finish unscrewing the loosened lug nuts by hand and set them somewhere they will not roll away, such as inside an upturned hubcap. Grip the flat tire firmly and pull it straight toward you to slide it off the bolts. Tires can be heavier than they look, so use your legs and keep your back straight. Lay the flat flat on the ground under the car near the frame as a backup, so that if the jack fails the car has something to land on rather than dropping all the way.
Lift the spare and line up its holes with the wheel bolts, then push it onto the hub until it sits flush. Thread the lug nuts back on by hand and turn them clockwise until they are snug. Hand-tightening at this stage helps the wheel seat evenly and prevents cross-threading. Do not use the wrench for full tightening yet, because the wheel can still spin while the car is in the air.
Lower the Car and Torque the Lug Nuts
Remove the flat tire from under the car, then slowly lower the jack until the spare is resting on the ground and bearing the weight of the vehicle. Now you can fully tighten the lug nuts. The key is to tighten them in a star or crisscross pattern rather than going around the circle in order. Tighten one nut, then the one across from it, then continue alternating. This pattern pulls the wheel against the hub evenly and prevents it from sitting crooked, which can cause vibration or loosening.
Apply firm, steady pressure with the wrench until each nut is tight, but avoid jumping on the wrench, which can strip the threads or overtighten. If you carry a torque wrench, set it to the value listed in your owner manual and tighten until it clicks. Lower the jack the rest of the way, remove it, and stow the flat tire, jack, and tools. It is good practice to recheck the lug nut tightness after driving a short distance, since they can settle.
Check the Spare, Mind the Speed Limit, and Get the Flat Fixed
Before you drive off, check the air pressure in the spare. Spares, especially the compact donut type, often lose pressure while sitting unused for months, and an underinflated spare handles poorly and wears quickly. A portable inflator is handy here so you can top up the spare to the pressure printed on its sidewall or in your manual. If you want a reliable unit to keep in the trunk, see our guide to the best tire inflators.
Compact spares are built for temporary use only. Keep your speed below the limit marked on the spare, which is usually around fifty miles per hour, and avoid long distances or highway driving when possible. The spare is meant to get you to a repair shop, not to serve as a permanent tire. Have the flat inspected and repaired or replaced as soon as you can, because driving on the donut for too long stresses the drivetrain and leaves you without a backup if another tire goes flat.
Frequently Asked Questions
How long can I drive on a spare tire?
A compact or donut spare is for temporary use only and should be driven no more than about fifty to seventy miles, staying under the speed limit printed on the tire, which is typically around fifty miles per hour. A full size spare can be driven longer, but you should still have the original flat repaired or replaced as soon as possible so you always have a working backup.
Why do I tighten lug nuts in a star pattern?
Tightening in a star or crisscross pattern, rather than going around in a circle, pulls the wheel evenly against the hub. This keeps the wheel sitting flat and centered, which prevents vibration, uneven stress on the bolts, and lug nuts working loose over time. Always tighten one nut, then the one across from it, and continue alternating until all are firm.
Where do I place the jack to change a tire?
Place the jack at the reinforced jack point your vehicle is designed for, usually a notch or arrow along the metal pinch weld under the door sill, just behind the front wheels or ahead of the rear wheels. Your owner manual shows the exact spots. Never lift the car by the body panels, plastic trim, or suspension parts, because the jack can punch through or slip off.
The Bottom Line
Changing a tire comes down to a safe stop, careful jack placement, and tightening the lug nuts evenly in a star pattern. Take your time, keep clear of traffic, and never put any part of your body under a car held up only by a jack. Once the spare is on, mind its speed limit and get the flat repaired soon so you are never caught without a backup. Practicing the steps once in your driveway turns a stressful roadside situation into a quick, manageable task.
