Few things deflate a morning quite like walking out to a flat tyre. The good news is that a puncture doesn't automatically mean buying a new tyre. Many punctures can be repaired safely and affordably — but not all of them, and knowing the difference matters for your safety.
When a puncture can usually be repaired
In Australia, tyre repairs are guided by a national standard that sets out where and how a tyre can be safely fixed. As a general rule, a puncture is a good candidate for repair when:
- It's in the central tread area. The middle band of the tread — the part that contacts the road — is the only zone where a proper repair can be carried out.
- The hole is small. Punctures from nails and screws around 6 mm or less in diameter can typically be repaired. Larger holes or gashes usually can't.
- The tyre has plenty of tread left. If the tyre is close to the legal minimum tread depth of 1.5 mm anyway, a repair rarely makes financial sense.
- You haven't driven far on it flat. A tyre that's been driven while flat, even a short distance, may have hidden internal damage.
When the tyre needs to be replaced
Some damage simply can't be fixed safely, no matter how new the tyre is:
- Sidewall damage. The sidewall flexes constantly as you drive, so plugs and patches won't hold there. Any cut, bulge or puncture in the sidewall means replacement — no exceptions.
- Shoulder punctures. The curved zone between tread and sidewall is also off-limits for repairs, for the same reason.
- Run-flat tyres driven while deflated. Most manufacturers advise against repairing a run-flat once it's been used in deflated mode, because the internal structure may be compromised.
- Visible internal damage. If the inner liner is creased, crumbled or discoloured, the tyre has been run under-inflated and its structure can't be trusted.
- Multiple punctures close together, large cuts, or exposed cords and steel belts.
Why a proper repair beats a quick plug
You may have seen string plugs or aerosol sealant cans sold as roadside fixes. These have their place — getting you off the roadside and to a workshop — but they're temporary measures, not permanent repairs.
A proper repair involves removing the tyre from the rim so a technician can inspect the inside for hidden damage, then fitting a combination plug-and-patch that seals the inner liner and fills the puncture channel. Without that internal inspection, there's no way to know whether the tyre was damaged while it lost pressure. If you've used a sealant or plug to get home, treat it as borrowed time and have the tyre properly assessed soon after.
Found a nail but the tyre isn't flat?
Leave it in place and head to a tyre shop. The nail is often acting as its own plug, and pulling it out can turn a slow leak into a flat. Slow leaks are worth acting on quickly — driving on an under-inflated tyre builds heat, wears the shoulders and can quietly ruin a tyre that would otherwise have been repairable.
A quick habit that helps
Check your tyre pressures once a month, including the spare. A tyre that keeps losing a few kPa between checks often has a small puncture you can't see — catching it early is usually the difference between a cheap repair and a new tyre.
If you've picked up a puncture or spotted a nail in your tread, the team at Global Tyres Geelong in North Geelong can inspect the tyre properly and let you know honestly whether a repair or replacement is the safer option — drop in or give us a call.