Free
Factory jack and lug wrench
Under the trunk floor or behind a side panel. Check it's actually there and that the jack still cranks before you need it at 6pm on a Sunday.
Auto Guide
How to Fix a Flat Tire: Step-by-Step Instructions
Time needed15 to 30 min
Temp spare speed limit50 mph
1
Loosen lugs
While the tire's still on the ground, so it can't spin.
2
Jack, swap, snug
Rated jack point. Spare on, lugs snug by hand.
3
Lower, then tighten
Full weight down first. Star pattern, not circular.
I've changed enough tires by now, mine and other people's in school pickup lots, that the actual swap takes about fifteen minutes. The other twenty minutes people burn is finding out mid-shoulder that the wrench in their trunk doesn't fit their lug nuts, or that nobody's checked the spare's air in three years. So here's the whole thing in order: what's worth keeping in the car, the sequence that keeps you from stripping anything, where people mess it up, and what it actually costs to fix versus just replace.
01 · What you need
What's already there, and what's worth buying
Most cars come with the two tools that matter. There's really only one thing I'd add to the factory kit, and one small kit that turns a lot of flats into a five-minute fix instead of a full swap.
$25–40
A real torque wrench
The single upgrade I'd tell anyone to make. The factory wrench gets nuts on, it doesn't tell you when they're actually tight, and both over and under-torqued lugs cause real problems.
$20–35
Plug kit and mini compressor
For a puncture in the tread, not the sidewall. Plugs it without pulling the wheel, then you air back up and you're done. This is the one that's saved me a full tire swap more than once.
02 · The actual swap
The order matters more than the muscle
Get these six in sequence and you'll never be the person jacking a car up on a slope with the parking brake off. Skip the order and you're the person with a tire that won't budge because it's spinning freely in the air.
Pull over safeFlat, level ground, hazards on, parking brake set.
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Break the lugs loose firstWhile the tire's still on the ground, so it can't spin.
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Jack it upUse the car's rated jack point, not the plastic rocker panel.
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Pull the flat, mount the spareLugs on by hand first, snug but not tight.
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Lower, then tightenStar pattern, full weight on the ground before final torque.
→
Check the spare's pressureMost temp spares run higher PSI than your regular tires. Check it.
03 · Where it goes wrong
The mistakes that actually cause damage
None of these are exotic. They're the same handful of things over and over, and they're the difference between a clean fifteen-minute job and a tow truck call.
×
Loosening lugs after the car's already jacked up
Nothing to brace against, so the tire just spins and you get nowhere.
Nothing to brace against, so the tire just spins and you get nowhere.
×
Tightening lug nuts in a circle instead of a star pattern
Pulls the wheel on unevenly, which can warp a rotor or leave the wheel seated crooked.
Pulls the wheel on unevenly, which can warp a rotor or leave the wheel seated crooked.
×
Using a random spot on the frame as a jack point
Your owner's manual shows the reinforced points. Anywhere else and you risk bending the pinch weld or having it slip.
Your owner's manual shows the reinforced points. Anywhere else and you risk bending the pinch weld or having it slip.
×
Treating a temporary spare like a normal tire
Those donuts are rated for around 50 mph and 50 to 70 miles. Past that you're wearing it out fast and changing how the car handles.
Those donuts are rated for around 50 mph and 50 to 70 miles. Past that you're wearing it out fast and changing how the car handles.
×
Never checking the spare until the day you need it
A flat spare on the day you get a flat tire is its own special kind of bad afternoon. Check it when you check your regular tires.
A flat spare on the day you get a flat tire is its own special kind of bad afternoon. Check it when you check your regular tires.
04 · What it costs
Fix it, plug it, or replace it
This is the part I actually track. A puncture in the tread isn't the same decision as a sidewall gash, and knowing the price gap before you're standing in a shop parking lot helps you not get talked into more than you need.
New tire, mounted and balanced$150–250
When it's this: sidewall damage, the tread is already worn down, or the puncture is too close to the edge to plug safely.
Tow to a shop, no usable spare$100–150
When it's this: no spare, a run-flat that's actually done, or a flat somewhere you'd rather not jack a car up. Roadside assistance through insurance or a card often covers it.
Shop patch or plug, in-bay$20–45
When it's this: straightforward tread puncture and you'd rather let someone else pull the wheel and do it properly from the inside.
DIY plug kit$10–20
When it's this: small tread puncture, you've got ten minutes, and you're comfortable doing it yourself. Same fix as the shop, without the wait.
Sealant in a can$8–12
When it's this: honestly, only to get you to a shop. It's a stopgap, not a fix, and it makes the eventual real repair messier.
Temporary spare speed limits vary by manufacturer and are usually printed right on the spare itself.