TL;DR: A light kerb scrape is usually cosmetic. Worry when you see a sidewall bulge or bubble, a bent or cracked rim, a tyre losing air, or the car pulling or vibrating afterwards. A sidewall bubble means the internal plies have been damaged and the tyre must be replaced — it cannot be repaired.

Is kerb damage always serious?

No — most kerb contact leaves nothing worse than a scuff on the alloy face, known as kerb rash. That is cosmetic. The concern is what a hard hit does out of sight: it can pinch the tyre’s sidewall against the rim, bend or crack the wheel, disturb the alignment, or damage the bead seal so the tyre slowly loses air. The speed and angle of the strike matter far more than how ugly the scrape looks. A gentle graze at walking pace is very different from clouting a kerb at 40 km/h while turning.

What does a dangerous kerb strike look like?

Run through this checklist after any solid hit. The moment you find one of these, treat the tyre or wheel as suspect until a professional clears it.

Sign	What it means	Urgency
Bulge or bubble on the sidewall	Internal plies damaged — replace tyre	Do not drive at speed
Cut or gouge into the sidewall	Casing may be compromised — inspect/replace	High
Visible dent, flat spot or crack on rim	Bent/cracked wheel — bead may leak or fail	High
Tyre going soft over days	Bead-seat or rim damage causing a slow leak	Medium
Car pulls or steering off-centre	Alignment knocked out	Medium
New vibration through wheel/seat	Bent rim or thrown balance weight	Medium
Scuffed alloy face only	Cosmetic kerb rash	Low

Why is a sidewall bubble the one to fear?

When a tyre is pinched hard between the kerb and the rim, the fabric plies inside the sidewall can split even though the outer rubber looks intact. Air then pushes into the rubber and forms a visible bubble. Michelin’s advice is blunt: a bulge means the carcass ply behind the rubber has been damaged, and such a tyre must be replaced because it can burst suddenly at speed. A sidewall bubble is not repairable — the sidewall flexes and carries load with every rotation, so no plug or patch is safe there. Worse, the bubble may not appear until days or weeks after the strike, which is why a professional inspection after a hard kerb hit is worth it even when the tyre looks fine.

Can a kerb strike bend or crack the wheel?

Yes. Alloy wheels are stiff but brittle; a sharp impact can bend the rim flange or crack it outright. A bent rim often shows up as a slow air leak (the tyre bead no longer seals cleanly) or a vibration that grows with speed. Whether a bent alloy can be saved depends on where and how badly — see can bent alloy wheels be safely repaired in Australia. If the bead area is damaged, you may also get the kind of bead leaks and rim-related air loss we cover elsewhere. A cracked structural wheel should never be driven on.

Should I get an alignment after hitting a kerb?

If the car pulls to one side, the steering wheel sits off-centre, or the tyres start wearing unevenly, yes — a hard kerb strike can knock toe or camber out of spec. The signs your car needs a wheel alignment are worth knowing. Left unchecked, a knocked alignment quietly chews one edge of a tyre; if you later notice a new shimmy, cross-check vibration at 100 km/h. A kerb hit and a pothole strike do very similar things, so the same checks apply to both.

What should I do right after a kerb hit?

Pull over safely and look at the tyre and wheel you struck. Check for bulges, cuts and rim damage; run your hand around the sidewall. If it looks and feels fine, drive gently and watch for pulling, vibration or a dropping tyre over the next few days, then have it professionally inspected if anything changes. If you see a bulge, a cut into the casing, or an obviously bent rim, fit the spare or call roadside assistance rather than drive on it.

Bottom line: cosmetic kerb rash is annoying, not dangerous. A sidewall bulge, a cut into the casing, a bent or cracked rim, a slow leak or a new pull/vibration is the real deal — and a sidewall bubble always means replacement. When in doubt after a hard hit, get it inspected.

FAQ

Can you repair a tyre with a kerb bulge?

No. A bulge means the internal plies are damaged. The sidewall can’t be safely repaired and the tyre must be replaced.

How do I know if I bent my rim on a kerb?

Look for a visible dent or flat spot on the rim, a slow air leak, or a vibration that grows with speed. A tyre shop can spin the wheel to confirm.

Is scuffed alloy from a kerb dangerous?

Usually not — surface kerb rash is cosmetic. It only becomes a concern if the rim edge is bent or cracked, which can affect the bead seal.

Should I claim kerb damage on insurance?

That depends on your policy and excess. Get a repair or replacement quote first, then weigh it against your excess. This is general information, not financial advice — check your policy.

Guidance here is general; have any suspected structural damage assessed by a licensed tyre fitter or wheel specialist. Suggested schema: Article + FAQPage.