Tire Test Reveals: Cheap and Worn Tires Can Extend Braking Distance by Up to 28 Meters on Wet Roads

Imagine this: you're driving on the highway at 80 km/h, it's raining, and the car in front of you suddenly brakes. You hit the brakes. If your car is equipped with new premium tires, you'll likely stop in time. But what if your tires are worn—or worse, cheap? You might continue driving for dozens of meters. Possibly straight into an accident.

This isn’t journalistic exaggeration—it’s fact. Tire tests by ADAC, AutoBild, and the German Technical Inspection Association (GTÜ) show shocking differences that don’t become visible until it’s too late.

Wet Roads – The Invisible Enemy

A new premium summer tire stops in about 30 meters on a wet road. The same tire, worn down to only 1.6 mm tread? It needs 48 meters. And if it’s a cheap tire made in China, the number can increase to 58 meters.

In ADAC's tests, the situation was downright grotesque: Where a car with new tires had already stopped, the car with worn tires was still moving at 35 km/h. This is no longer a question of “if” an accident happens, but when.

What Happens with Every Lost Millimeter?

Every millimeter lost from the tread reduces the tire’s ability to disperse water. When the tread is shallow, a layer of water builds between the tire and the road surface—leading to aquaplaning. ADAC found:

• A new tire (8 mm) handled water up to 87 km/h
• A tire with 4 mm tread aquaplaned already at 63 km/h

A small difference in numbers—an enormous difference in real life.

⚠ Cheap Tires – A Budget Risk

New budget tires (e.g., Linglong, Autogrip) already stop 10–11 meters later than mid-range tires when new. Once those cheap tires are worn? The difference grows even more. In GTÜ tests, a cheap Chinese tire stopped 11 meters later than a European reference tire—and that was when it was new!

When worn, the situation becomes even more dangerous: Tests show that budget tires with 2 mm tread depth lose grip completely at 60–65 km/h. That’s basically a “ticket to aquaplaning.”

🏁 Can a Worn Tire Ever Be Better?

The only scenario where a worn tire might theoretically brake better is on dry asphalt. With less tread, the contact patch can be larger, and braking might be slightly shorter. AutoBild's test showed that some tires with 2 mm tread braked 14% shorter than new ones on dry roads.

But this is the exception, not the rule. ADAC warns: ideal dry conditions are rare. Estonian weather is rainy, variable, and often damp. And moisture + worn tire = bad combination.

A Good Tire Ages Gracefully

Premium tires (e.g., Michelin, Pirelli) maintain grip even when worn. Tests showed that, for example, Michelin tires with 2 mm tread performed nearly as well as new ones. Cheap tires, on the other hand, degrade much faster—not physically, but in performance.

Both AutoBild and Vi Bilägare emphasize: A “good” tire wears well. A “bad” tire becomes dangerous. And most importantly—if your braking distance differs by 20 meters, that can mean the difference between life and death.

Conclusion: Don’t Wait Until the Last Millimeter

The law allows summer tires down to 1.6 mm tread depth, but that’s a legal minimum, not a safety standard.
Tire testers recommend replacing summer tires when they reach 3 mm.

A tire is not just a black ring around your wheel—it’s your car’s only point of contact with the road.
And with a bad or worn tire, that contact may disappear right when you need it most.