Knowing how to change a flat tire is one of the most useful skills you can have as a driver — especially in Calgary, where potholes, road debris, and extreme winter conditions can leave you stranded at any moment. This guide walks you through exactly what to do, step by step, even if you’ve never changed a flat tire before.
Can You Drive on a Flat Tire?
No — you should never drive on a flat tire if you can avoid it. Even driving a short distance on a completely flat tire can destroy the tire beyond repair, bend or crack your rim, and damage your suspension. If you feel a sudden loss of pressure while driving, don’t brake hard or swerve. Ease off the accelerator, grip the steering wheel firmly, and slowly guide your vehicle to a safe stop. The cost of driving even 500 metres on a flat can turn a $40 repair into a $400 rim replacement.
What Do You Do When You Get a Flat Tire?
The moment you realize you have a flat tire, stay calm and follow these steps in order. Panicking or making sudden moves is the most dangerous thing you can do. Here’s exactly what to do — from the moment you notice the flat to the moment you’re back on the road.
How to Change a Flat Tire — 8 Simple Steps
What You’ll Need Before You Start
Most vehicles come with these tools in the trunk — check yours now so you’re not looking for them on the side of the road:
- Spare tire (check it’s inflated — do this before winter every year)
- Car jack
- Lug wrench
- Vehicle owner’s manual
- Wheel wedges or large rocks
- Reflective warning triangle or flares (optional but strongly recommended)
- Flashlight if it’s dark
- Gloves
Step 1: Get to a Safe Location
Don’t stop where you are. As soon as you feel the flat, gradually slow down and look for a safe place to pull over — a parking lot, a wide shoulder, or a side street. Avoid stopping on a curve, a hill, or a narrow shoulder with fast-moving traffic. On Calgary’s highways like Deerfoot or the Ring Road, keep moving slowly until you reach a wider, safer spot. Turn on your hazard lights the moment you realize something is wrong.
Step 2: Secure the Vehicle
Once stopped, apply your parking brake immediately — this prevents the car from rolling while you work. Place wheel wedges, large rocks, or anything solid behind the tires on the opposite end of the flat. If you’re changing a rear tire, wedge the front tires. If you’re changing a front tire, wedge the rear. Place a reflective triangle behind your vehicle if you have one — especially important on Calgary roads after dark or during low-visibility winter conditions.
Step 3: Loosen the Lug Nuts Before Jacking
This step surprises most first-timers — you loosen the lug nuts while the tire is still on the ground, not after. Use the lug wrench and turn counterclockwise. Don’t remove them yet — just break the resistance, about a quarter to half turn each. If you try to loosen them after the car is jacked up, the wheel will just spin freely and you won’t be able to get them off.
Step 4: Position the Jack and Lift the Vehicle
Check your owner’s manual for the correct jack point — it’s usually a reinforced section of the vehicle frame just behind the front wheels or just in front of the rear wheels. Placing the jack in the wrong spot can crack your vehicle’s frame or cause the car to fall. Once positioned correctly, raise the vehicle until the flat tire is about 15 cm (6 inches) off the ground. Never put any part of your body under the vehicle while it’s on the jack.
Step 5: Remove the Lug Nuts and the Flat Tire
Now fully remove the lug nuts and place them somewhere safe — a pocket, a cup holder, or on the ground near you where you won’t accidentally kick them. Pull the flat tire straight toward you and set it aside. It’s heavier than it looks, so use both hands and keep your back straight.
Step 6: Mount the Spare Tire
Lift the spare tire and line up the holes with the bolts on the wheel hub. Push it straight onto the hub until it sits flush. Hand-tighten the lug nuts back on — use a star or cross pattern (tighten one, then the one directly opposite, then alternate) rather than going around in a circle. This keeps the tire centered and seated evenly.
Step 7: Lower the Vehicle and Fully Tighten the Lug Nuts
Lower the jack slowly until the spare tire is touching the ground but the full weight of the vehicle isn’t on it yet. Now use the lug wrench to fully tighten the lug nuts — again in the star pattern, as tight as you can get them. Once fully tightened, lower the vehicle completely and remove the jack. Give each lug nut one final check to make sure nothing has loosened during the process.
Step 8: Check the Spare Tire Pressure and Drive Carefully
Most spare tires — especially compact “donut” spares — are rated for a maximum of 80 km/h and no more than 80–100 km of driving. They are not a permanent solution. Check the pressure if you have a gauge, drive carefully to the nearest tire shop, and get your flat tire inspected or replaced as soon as possible. In Calgary, Good Tire is open every day — drive straight to us at 2125 52 St SE.
Can You Repair a Flat Tire Yourself?
For a temporary roadside fix — yes, a plug kit can get you moving again. But a plug alone is not a permanent repair. It doesn’t include an internal inspection or liner repair, and it can fail without warning at highway speeds. A proper flat tire repair means removing the tire from the rim, inspecting the liner, applying a patch-plug combination from the inside, and remounting the tire. That’s something only a tire shop can do correctly.
When to Call a Professional Instead of Changing It Yourself
Changing a flat tire yourself is absolutely manageable in the right conditions. But there are situations where you should call a professional instead:
- It’s dark, icy, or you’re on a busy highway with no safe shoulder
- You don’t have a spare or your spare is also flat
- The tire has a sidewall blowout — not a simple puncture
- You’re not confident the jack is positioned correctly
- You have a medical condition that makes physical work unsafe
- Your lug nuts are corroded and won’t loosen
Your safety matters more than saving time. When in doubt — call for help.
We can Fix Your Flat Tire In No Time!
If you’re looking for a place to fix your flat tire — Good Tire is the number one choice in Calgary. We offer full service for your vehicle, wide selection of tires, rims, and wheels, and professional technicians to take care of any car concern you may have. No need for appointment. We open every day!
Frequently Asked Questions – Flat Tire Repair
How Do I Change a Flat Tire if I Don’t Have a Spare?
If your vehicle doesn’t have a spare — increasingly common in newer models — you have two options. First, use a tire inflation kit or fix-a-flat canister if one came with your vehicle. These work for small tread-area punctures only and are strictly temporary. Second, call roadside assistance or a mobile tire service. Do not attempt to drive any significant distance on a completely flat tire — the rim damage alone will cost far more than a tow.
What Does Run Flat Mean for Tires?
Run-flat tires are specially designed with reinforced sidewalls that allow you to keep driving after a puncture — typically for up to 80 km at speeds up to 80 km/h. If your vehicle came with run-flat tires, you may not have a spare at all. You’ll still see the TPMS warning light when pressure drops, but you have a short window to reach a tire shop safely. Run-flat tires cannot always be repaired after being driven on — bring them to us and we’ll inspect them properly.
Can a Tire Go Flat Without a Leak?
Yes. A few common causes:
- Temperature drop — tire pressure drops roughly 1 PSI for every 6°C decrease in temperature. Calgary’s Chinook cycles and sudden cold snaps can drop tire pressure significantly overnight without any puncture at all
- Aging valve stem — a cracked or corroded valve stem leaks air slowly over time
- Bead leak — air escapes where the tire meets the rim, often on older wheels with corrosion
- Porous tire — very old tires can lose pressure through the rubber itself
If your tire keeps losing pressure but you can’t find a puncture, bring it in — we’ll find the source.
Can You Just Patch a Tire With a Nail in It?
Yes — if the nail is in the central tread area, no larger than 6mm, and the tire hasn’t been driven on flat, it can be safely repaired with a patch-plug. Here’s the important part: leave the nail in the tire. It’s temporarily sealing the hole. Pulling it out causes immediate pressure loss. Drive carefully to a tire shop and let a technician remove it and assess the damage properly.
Will a Flat Tire Ruin My Rim?
It can — and quickly. Driving even a short distance on a completely flat tire puts the full weight of the vehicle on the rim. Steel rims can bend or crack. Alloy rims are even more vulnerable. A bent rim can’t always be repaired and may need full replacement, which costs significantly more than the original tire repair. The safest rule: if you’re on a flat, stop as soon as it’s safe to do so.
Can a Flat Tire Make You Lose Control?
Yes — and it happens fast. A sudden blowout at highway speed causes an immediate pull toward the side of the flat. Rear blowouts are especially dangerous as they can cause the vehicle to fishtail. If you experience a blowout while driving, do not brake hard. Grip the wheel firmly with both hands, ease off the accelerator, and let the vehicle slow naturally before gently steering to safety. Once stopped safely, call for help.
Can a nail in my tire cause a blowout?
Yes — if left unattended long enough. A nail creates a slow leak that gradually drops your tire pressure. Once pressure gets low enough, the tire overheats and the sidewall collapses — that’s a blowout. The good news is a nail caught early is usually a simple, affordable flat tire repair. Don’t wait and hope it holds — come in and we’ll check it in minutes.
