Flat Tire Change Guide: How to Do It Safely, Step by Step

At a glance

Before you start: safety first

Pull as far off the road as possible onto flat, stable, and ideally paved ground — grass or gravel can shift under a jack. Turn on hazard lights, set the parking brake, and if you have wheel chocks, place them on the wheel diagonally opposite the flat. If you're on a busy road or highway shoulder with no safe way to change the tire, it's often safer to call roadside assistance rather than working close to traffic.

What's in the kit

• Spare tire — usually a compact 'space-saver' spare in the trunk or underneath the vehicle; check that it's properly inflated (typically a higher pressure than regular tires, often 60 psi — check the sidewall).
• Jack — usually a scissor jack stored with the spare.
• Lug wrench — sometimes combined with the jack handle.
• Owner's manual — shows the correct jack points for your specific vehicle, which matters since jacking at the wrong spot can damage the body or fail to lift safely.

Step-by-step tire change

1. Park on flat, stable ground; set the parking brake and hazard lights; chock the opposite wheel if possible.
2. Remove the wheel cover or hubcap if present to access the lug nuts.
3. With the wheel still on the ground, use the lug wrench to break each lug nut loose about a quarter turn (don't remove yet) — this is much easier with the tire's grip on the road than once it's lifted and spinning freely.
4. Position the jack under the vehicle's designated jack point nearest the flat tire (check the owner's manual) and raise the car until the flat tire is a few inches off the ground.
5. Fully remove the loosened lug nuts and pull the flat tire off.
6. Mount the spare, then thread the lug nuts on by hand and snug them in a star/criss-cross pattern (not consecutively around the wheel).
7. Lower the car until the tire touches the ground but the full weight isn't yet on it, then tighten the lug nuts firmly in the same star pattern.
8. Lower the car fully, remove the jack, and give the lug nuts one final tightening pass.
9. Check the spare's pressure once you have access to a gauge/compressor, and have the flat tire inspected or repaired as soon as possible.

Torque and the star pattern, explained

Tightening lug nuts in a star (criss-cross) pattern rather than going around the wheel in a circle pulls the wheel evenly and flush against the hub, avoiding warping the wheel or rotor. A torque wrench is the right way to finish the job to the manufacturer's specified value, since over-tightening can stretch or damage studs and under-tightening risks the wheel loosening over time; it's worth having the torque double-checked with a proper wrench once you're somewhere safe, even if you snugged it firmly by hand on the roadside.

When not to change it yourself

If you're on a narrow shoulder with fast-moving traffic close by, in severe weather, or unsure the ground is stable enough for a jack, it's safer to call roadside assistance and wait in the vehicle (with a seatbelt on, away from the traffic side) than to risk changing a tire in an unsafe spot. Many insurance policies and some manufacturer warranties include roadside assistance at no extra cost, which is worth checking before a flat happens.

Mistakes to avoid

• Loosening lug nuts after jacking the car up, when the wheel can spin freely and make it much harder.
• Jacking at a random point on the body instead of the manufacturer's marked jack point.
• Tightening lug nuts in a circular order instead of a star pattern.
• Driving far or fast on a compact spare tire beyond its rated speed and distance.
• Forgetting to have the flat tire repaired or replaced promptly — driving indefinitely on the spare isn't safe long-term.