What Happens If I Drive on a Flat Tyre?
So you have had a nice breakfast, you’re getting ready for work, you jump in your car ready to seize the day, and you begin to hear thump thump thump. You jump out to check, and see that one of your tyres is flat! The question that follows is always: is it safe to keep driving, even for a few hundred metres?
Can You Drive on a Flat Tyre?
The short answer is no. Driving on a flat tyre, even briefly, changes how the tyre behaves under load and can turn a simple, repairable puncture into a costly replacement. Here is what happens to the tyre, how to spot the damage, and what to do next.
What Happens When You Keep Driving on a Flat Tyre?
A properly inflated tyre uses air pressure to hold its shape and carry the weight of the vehicle. Once that pressure drops, the sidewall starts to flex and fold under the car’s weight with every rotation. Continue driving and the rubber overheats, the internal structure separates, and the sidewall can collapse completely, a condition known as “run flat” damage.
At the same time, the wheel rim loses its cushion of air and begins to take the impact directly. On rough roads, at speed bumps, or over potholes, this can crack or bend the rim. As explained in our blog driving with a damaged rim, a compromised rim can no longer maintain the tyre’s shape properly, and cracks in particular cannot be reliably welded back to a safe standard, meaning the wheel needs replacing rather than repairing.
The longer you drive on a flat, the more of these problems are likely to stack up, and the more likely a straightforward puncture repair turns into a full tyre and rim replacement.
Signs of Run Flat and Rim Damage
A few warning signs point to damage that has already happened:
- A persistent thumping sound while driving, which often means the rim is struggling to hold its shape
- Vibration through the steering wheel
- The car pulling noticeably to one side
- Rubber residue or scuffing on the inside sidewall
- A visible dent, crack, or flat spot on the wheel rim
If any of these show up after driving on a low or flat tyre, book the car in rather than waiting for the next warrant of fitness. Left unchecked, a damaged rim increases the risk of a sudden blowout at speed.
How Drury Tires Decides: Repair or Replace
Whether a tyre can be repaired boils down to a few checks our team runs through in person, including tread depth, the location of the puncture, and the extent of any sidewall or run flat damage.
Tread depth matters because the legal minimum in New Zealand is 1.5mm across the tyre. A tyre already close to that limit, combined with flat tyre damage, is far less likely to be a safe candidate for repair. Punctures through the tread are generally repairable, while damage to the sidewall or run flat wear usually is not, since the structural strength in that area cannot be restored.
Drury Tires includes free puncture repairs for the first six months on new tyres purchased from us, so a straightforward puncture caught early can be a quick, no-cost fix.
After a Flat Tyre: Check the Alignment Too
Driving on a flat, or hitting a pothole or kerb while the tyre was low, can knock the wheel out of alignment even if the tyre itself is repairable. Drury Tires recommends a wheel alignment check after any major pothole or kerb strike, alongside the usual signs of misalignment: uneven tyre wear, the car pulling to one side, or a steering wheel that sits off-centre once you are driving straight.
Preventing the Next Flat Tyre
A lot of flats start with a slow pressure loss that goes unnoticed until it becomes a problem on the road. Checking tyre pressure regularly helps catch this before it becomes a flat. A tyre pressure monitoring system does this automatically, warning you about low pressure early, before it becomes a safety issue on the road.
It also pays to prepare for a tyre emergency before it happens: keep a working spare, jack, wheel spanner, and lock nut in the car, along with a basic understanding of how to use them, so a flat tyre away from home does not cause more delay than necessary.
Contact Us
If you are dealing with a flat tyre right now, or want a rim and tread check after driving on one, the Drury Tires team is based at 1 Firth Street, Drury, and serves Auckland’s southern suburbs, including Manurewa, Papakura, Ramarama, and Pukekohe. Call 0800 443 465, or get in touch to book a check. If the tyre needs replacing rather than repairing, browse our range of tyres in Auckland for a straightforward, fairly priced fit.