Tyre Keeps Losing Air but No Puncture? Check the Wheel

If your tyre keeps losing air but there's no nail or screw in it, the problem is very often the wheel, not the tyre. At our Congleton workshop, a slow leak with no puncture usually turns out to be a cracked or buckled alloy wheel, and occasionally corrosion where the tyre seals against the rim. A new tyre won't fix either of those.

We see cars with this problem most weeks, especially once potholes start opening up in autumn and winter. Here's how we track down a slow leak, why you shouldn't keep topping it up, and what the proper fix is.

How we find a slow leak with no puncture

A slow leak can come from four places, so we check them in order:

1. The valve. We brush soapy water over the valve. If it's leaking, you'll see bubbles straight away.
2. The back of the wheel. If the valve is fine, the wheel comes off and we check the inner barrel, the part you can't see from outside the car, for cracks and buckles, again with soapy water.
3. The tyre. We spray soapy water around the tread and sidewalls to rule out a puncture you can't see.
4. The bead seat. If none of those leak, the tyre comes off so we can check for corrosion around the bead, where the tyre seals against the alloy.

One of those four is always the culprit. In our experience, the most common answer by far is a cracked alloy wheel or a buckled one, usually after a pothole.

Why a tyre keeps losing air from a cracked or buckled wheel

A pothole impact can crack the inner barrel of an alloy wheel or bend the rim out of shape. Either way, the tyre can no longer seal properly, so air seeps out slowly. Because the damage is on the inside of the wheel, most drivers never see it. They just notice a tyre pressure warning that keeps coming back.

A recent example from our workshop: a customer had been pumping a tyre up again and again. When we took the wheels off, we found two cracks on one wheel and another crack on a second wheel, and both wheels were buckled as well.

Tyre losing air with no nail in it? Bring it to our Congleton workshop and we'll find the leak. Crack and buckle repairs are walk-in, Monday to Friday, 10am to 5:30pm. See our alloy wheel crack repair in Congleton or call 0330 133 8719.

Why you shouldn't keep topping it up

Topping the tyre up gets you to work, but it doesn't stop the damage. A crack can grow, and once a wheel is cracked, it isn't as strong as it should be. Keep driving on it and you risk a blowout at speed.

Kyle, who runs our workshop, puts it simply: the sooner you spot it, the better. Leave it, and the crack or corrosion keeps getting worse, which can make the repair bigger and more expensive. In the worst case, a wheel that could have been repaired has to be replaced.

What you can check at home

• Soapy water is the best test. Mix washing-up liquid and water, brush or spray it over the valve and the tyre, and watch for bubbles.
• Think back. Did the leak start after a pothole or a kerb strike? That points to a cracked or buckled alloy wheel.
• Don't drive on a wheel you think is cracked or buckled. If you can, take the wheel off and bring it in. If you can't, get the car recovered by the AA or RAC if you're a member.

From 26 October 2026, our mobile crack and buckle repair service can also come to you at home or at the roadside, as long as it's a safe place to work (never on a motorway). It's £96 per repair plus a £60 call-out on weekdays, or £120 out of hours and at weekends.

Corrosion around the bead: the other slow-leak cause

If the wheel isn't cracked or buckled, the next suspect is corrosion where the tyre seals against the wheel. It usually builds up as a car gets older, for three reasons:

• Water. Water sits on the bead seat and slowly eats away at the paint.
• Tyre changes. Every time a tyre is taken off and refitted, it drags across the bead and wears the paint a little more.
• Heat cycles. The wheel heats up and cools down every time you drive, which works the paint loose over time.

Eventually the paint and the alloy separate, leaving tiny gaps, and air escapes through them.

Bead corrosion: temporary fix or proper fix?

A tyre shop can clean the bead and reseal it, and a new tyre will get you back on the road. Both are temporary fixes, because the corroded surface is still there and the leak tends to come back.

The proper fix is a full alloy wheel refurbishment. We strip the wheel right back to bare metal, repair it and powder coat it, which leaves an even, smooth surface for the tyre to seal against. Refurbishment costs £90 per wheel, which is a significant saving on buying a new wheel.

If you'd like to know what a crack repair costs before you come in, our guide to cracked alloy wheel repair costs explains what affects the price.

Quick answers

Why does my tyre keep losing air with no puncture?

Usually a cracked or buckled wheel, a leaking valve, or corrosion where the tyre seals against the rim. Soapy water will show you where the air is escaping.

Is it safe to keep pumping up a tyre that keeps going down?

Only to get it checked. If the wheel is cracked, it's weaker than it should be and the crack can grow, which risks a blowout.

Will a new tyre fix a slow leak?

Not if the leak is from the wheel. A cracked, buckled or corroded wheel will keep leaking with a new tyre on it.

Book a crack repair in Congleton

We repair cracked alloy wheels in-house at our Congleton workshop for drivers across Cheshire and Staffordshire, including Sandbach and Biddulph. Crack repair is £96 per crack: the wheel is inspected first, TIG welded and pressure tested. Walk in any time from 10am to 5:30pm, Monday to Friday. If a crack isn't safe to repair, we'll tell you and advise on replacement.

Find out about alloy wheel crack repair

Losing air or spotted a crack? Send us a few clear photos or call 0330 133 8719 and we'll give you honest advice.