Changing a flat tire is a straightforward process that involves finding a safe location, loosening the lug nuts, jacking up the vehicle, removing the flat, mounting the spare, and lowering the car. The most critical steps are ensuring your safety and properly tightening the lug nuts in a star pattern to avoid warping the brake rotor.
Safety First: Pull Over Properly
As soon as you realize you have a flat, gently slow down and avoid sharp steering or braking. Pull over onto a level, solid surface as far from traffic as possible. Engage your parking brake and turn on your hazard lights. Place a wheel chock (a large rock or a log will work in a pinch) against the tire diagonally opposite the flat to prevent the car from rolling.
Gather Your Tools
You'll need your car's jack, lug wrench, and spare tire (a compact "donut" spare or a full-size spare). The donut spare is temporary and has strict speed and distance limits (usually under 50 mph for less than 50 miles).
The Step-by-Step Process
- Loosen Lug Nuts: Before lifting the car, use the lug wrench to break the torque on the lug nuts by turning them counterclockwise. You may need to use your foot for leverage, but just crack them loose; don't remove them completely.
- Position the Jack: Consult your owner's manual for the correct jacking points, which are typically reinforced metal seams or tabs on the frame, not the plastic bodywork or the floorpan. Crank the jack until it makes firm contact.
- Lift the Vehicle: Jack up the car until the flat tire is about 6 inches off the ground.
- Remove the Flat Tire: Unscrew the lug nuts the rest of the way and pull the tire straight toward you.
- Mount the Spare: Place the spare tire onto the wheel studs. Hand-tighten the lug nuts until they are snug.
- Lower the Vehicle: Carefully lower the jack until the car is fully on the ground.
- Tighten Lug Nutsin a Star Pattern: This is crucial. Tighten the lug nuts in a crisscross or star pattern to ensure the tire is seated evenly. Use the wrench to tighten them as much as possible.
| Vehicle Type | Typical Lug Nut Torque Specification (ft-lbs) | Donut Spare Speed/Distance Limit |
|---|
| Compact Sedan | 80 - 100 | 50 mph / 50 miles |
| Midsize SUV | 100 - 120 | 50 mph / 50 miles |
| Full-Size Truck | 120 - 150 | 50 mph / 50 miles |
Drive cautiously to the nearest repair shop to have your flat tire repaired or replaced. A donut spare is not designed for long-term use.
