The question of “how much tread depth for winter tires” is on many drivers’ minds as the cold season approaches. Tire tread depth is crucial for safety on winter roads. But how many millimeters of tread should winter tires have, and why is it so important?
Legal Requirements and Expert Recommendations
In Germany, the legal minimum tread depth for all tire types is 1.6 mm. However, for winter tires, a minimum tread depth of 4 mm is strongly recommended to ensure sufficient grip on snow and ice. Experts, such as renowned tire expert Hans-Joachim Müller from the Society for Technical Inspection (GTÜ), even advise a tread depth of at least 5-6 mm for optimal safety in winter conditions.
Why is Tread Depth So Important?
The tread grooves of tires are designed to displace water and slush from the contact patch. The deeper the tread grooves, the more water and slush can be displaced. If the tread is too shallow, the tire can no longer sufficiently displace the water film, leading to the dreaded aquaplaning. On snow and ice, the tire’s grip also decreases drastically with decreasing tread depth, which can lead to longer braking distances and an increased risk of accidents.
Dangers of Worn Winter Tires
With worn winter tires, you risk not only your own safety but also that of other road users. Possible consequences include:
- Longer braking distances: During a full brake from 50 km/h, the braking distance on snow can increase by up to 10 meters with worn tires.
- Poorer lateral guidance: In curves, the vehicle can skid more easily because the tires cannot build up enough grip.
- Increased risk of aquaplaning: Even with small amounts of water on the road, loss of traction can occur.
Car aquaplaning on a winter road with worn tires.
How Can I Recognize Worn Winter Tires?
In addition to regularly checking the tread depth with a tread depth gauge, you can also look for the following signs:
- Tread wear indicators: Small bars are located in the tread grooves, marked with the letters “TWI” (Tread Wear Indicator). If the tread grooves reach the height of these bars, the minimum tread depth has been reached, and the tire must be replaced.
- Uneven wear: If the tread is more worn on one part of the tire than on other parts, this indicates incorrect tire pressure or defective axle geometry. In this case, you should visit a workshop.
Conclusion: Safety First!
Even though the legal minimum tread depth is 1.6 mm, you should replace your winter tires at the latest when the tread depth reaches 4 mm. This is the only way to ensure that you have optimal grip and short braking distances, even in winter road conditions. Pay attention to your safety and that of others – drive with sufficient tread through the winter!
More Questions About Winter Tires?
Do you have more questions about winter tires? Visit our website autorepairaid.com – there you will find more helpful information and expert tips on car care and maintenance. You are also welcome to contact us by phone; our team is always there to help you.
