Change a tire by pulling over to a flat, stable area with hazards on, loosening the lug nuts slightly while the car is still on the ground, jacking the vehicle up until the flat clears the ground by a few inches, removing the lug nuts fully and pulling the tire off, installing the spare, hand-tightening the lug nuts in a crisscross pattern, lowering the car, then fully tightening the nuts with the car back on the ground. The whole process takes about 15-30 minutes with basic tools most cars already carry.
Here’s the full step-by-step process, the safety precautions that matter most, and what to do once the spare is on.
Key Takeaways
- Always loosen lug nuts before jacking the car up — trying to loosen them once the wheel is off the ground just spins the tire.
- Tighten lug nuts in a crisscross (star) pattern, both hand-tight before lowering and fully torqued after — this ensures even pressure on the wheel.
- Never work under a vehicle supported only by a jack — the jack lifts, but shouldn’t be your only point of support if anything shifts.
- Check your spare tire’s pressure monthly — it can lose pressure over time even sitting unused in the trunk.
Before You Start: Safety First
Pull over to a flat, stable area away from traffic — a parking lot or a wide shoulder — turn on your hazard lights, and engage the parking brake before doing anything else (Motorist Assurance Program). If you’re stuck in an especially unsafe spot, like a busy highway shoulder, and can’t move the vehicle somewhere safer, keep your hazards on and call for help rather than attempting the change in a dangerous position — police can often help block or divert traffic while you or a roadside assistance provider handle it.
If you have flares or reflective warning triangles, set them out according to their instructions, and never turn your back to oncoming traffic while working. Wheel wedges placed behind the rear tires (when changing a front tire) or in front of the front tires (when changing a rear tire) help prevent the car from rolling during the process.
The Step-by-Step Process
Loosen the lug nuts slightly while the vehicle is still on the ground — this keeps the wheel from spinning freely, which happens if you try to loosen them once the tire is already lifted off the ground (SafeWise). Position the jack on a solid, flat point specified in your owner’s manual and pump or crank it until the flat tire clears the ground by a few inches — avoid leaning over the vehicle or reaching underneath it while it’s supported only by the jack.
Remove the flat tire by fully taking off the now-loosened lug nuts and pulling the tire straight off the hub. Install the spare by aligning it with the wheel hub, then hand-tighten the lug nuts in a crisscross pattern rather than working around the wheel sequentially — this distributes pressure evenly and helps prevent the wheel from seating unevenly. Lower the vehicle back to the ground, then use the lug wrench to fully tighten the nuts in that same star pattern, double-checking that every nut is genuinely secure before driving.
After the Spare Is On
Most spare tires — particularly the compact “donut” style common in newer vehicles — are only rated for limited speed and distance, typically 50 mph and around 50-70 miles, so get to a repair shop or tire retailer promptly rather than treating the spare as a full replacement. If you’re not sure whether your specific spare has additional limitations, our guide on how to put air in a tire covers finding your vehicle’s correct PSI specs, which applies to checking spare tire pressure too.
If this happens frequently or you want a faster process next time, our guide on how long it takes to change a tire breaks down realistic timing for different experience levels, and our guide on how to read a tire sidewall helps you confirm your spare and replacement tires are actually the correct size and rating for your vehicle.
Frequently Asked Questions
What if my lug nuts won’t budge even with the lug wrench?
Standing on the end of the lug wrench (with the car still on the ground, not jacked up) adds significant leverage and is usually enough to break a stuck nut loose — a “cheater bar” or breaker bar can also help if you have one available.
Can I drive on a flat tire for a short distance to reach a safer spot?
For a very short distance at low speed, it’s sometimes unavoidable, but it risks damaging the wheel and tire beyond repair — only do this if the alternative is genuinely unsafe, and go slowly.
Do I need to check the spare tire pressure regularly even if I never use it?
Yes — spare tires lose air pressure gradually over time just like regular tires, even sitting unused in the trunk. Check it monthly along with your other tires so it’s actually usable when you need it.
Is it worth learning to change a tire if I have roadside assistance?
Still worth knowing — roadside assistance response times vary, and knowing how to change a tire yourself means you’re not stuck waiting in an unsafe location if help is delayed.
The Bottom Line
Changing a tire takes about 15-30 minutes: secure the vehicle, loosen lug nuts before jacking it up, lift the car, remove the flat, install the spare with a crisscross tightening pattern, then lower and fully torque the nuts. Prioritize safety — a flat, stable location, hazard lights, and never working under a vehicle supported only by a jack — and remember most spares have speed and distance limits, so plan to get a full repair or replacement soon after.
Dealing with tire or wheel damage that needs a professional look? Contact San Diego Bumper and Collision for an inspection.
