The 'Coin Test' & 3 Signs You Need New Tires Immediately

Why You Shouldn't Wait Until the Rainy Season

In Hong Kong's rainy and humid climate, driving safety relies heavily on your tires' grip. Many drivers wait until the rainy season arrives, or even after experiencing a slip, to realize they need a replacement. However, severely worn tires drastically increase braking distances and the risk of hydroplaning. Checking your tires early not only ensures your safety but also prevents expensive repair costs caused by unexpected blowouts.

How to Do the 'Coin Test': Checking Tread Depth

The "Coin Test" is a quick and simple method to check your tread depth anytime. In Hong Kong, the legal minimum tread depth is 1.6 mm. You can insert a coin (such as a 20-cent or 50-cent coin) into the deepest groove of your tire. If the pattern or text on the edge of the coin is completely exposed, it indicates that your tread depth may have fallen below the safety standard. Your tires can no longer displace water effectively and must be replaced immediately for wet-weather safety.

3 Danger Signs You Need New Tires Right Now

Besides tread depth, there are three danger signs you must look out for. First is "Sidewall Bulges or Blisters," typically caused by hitting potholes or curbs, which damages the tire's internal structure and can lead to a sudden blowout. Second is "Visible Cracks or Dry Rot"—long-term exposure to sun and heat hardens the rubber and causes cracks, signaling the end of the tire's lifespan. Finally, "Abnormal Vibration While Driving"; if your car shakes continuously on smooth roads, it might be due to broken internal belts or uneven wear. If you spot any of these signs, seek professional inspection and replace your tires immediately.