How deep does a tire scratch need to be before replacement?

[Stella]

Tire replacement depends on the depth of the scratch: 1. If the steel cord ply is exposed, immediate replacement is necessary; 2. Even if only the steel cord ply is visible, replacement is recommended for driving safety; 3. If the scratch on the tire tread is shallow, affecting only a small portion of the surface, and the vehicle is mostly driven in urban areas, a simple tire repair may suffice. Solutions for tread scratches: 1. If the damage is minor and doesn't affect usage, regularly check for cracks, accelerated wear, or bulges near the scratched area—replace the tire if these signs appear; 2. If the front tire is damaged, consider swapping it with a rear tire for better safety in case of a blowout; 3. It's advisable to have the tire inspected by professionals at a specialized tire repair shop and follow their recommendations.

[CaydenFitz]

A few days ago, my tire got scratched by a roadside stone. I asked the mechanic at the repair shop, and he said the depth of the scratch is crucial. If you can see the internal cords or metal wires of the tire, it must be replaced immediately; otherwise, it could easily blow out. Generally, if the depth exceeds 2mm and exposes the internal structure, it's dangerous. Also, if the tread wears down below 1.6mm, it should be replaced because the grip is significantly reduced, making the car prone to skidding in the rain. I usually use a one-yuan coin to measure the depth: insert the coin into the tread—if the entire national emblem side is visible, it means the depth is less than 1.6mm. If the scratch isn’t deep and only on the surface, it might still hold for a while, but you should watch for any cracking or bulging. Safety is the top priority—replacing a new tire doesn’t cost much, and regularly checking tire pressure and wear can prevent accidents. Remember, the sidewall of the tire is the most vulnerable, so be extra careful if it gets scratched.

[MaverickLee]

After experiencing multiple tire incidents, I deeply understand the importance of scratch depth. If a scratch is deep enough to expose the cord layer, the tire must be replaced immediately regardless of its location, as this compromises the tire's strength. Standard tread depth below 1.6mm requires replacement, and wear indicators are usually hidden in the main grooves—when they're flush, it's a clear signal. While professional tools or depth gauges are ideal for measurement, regular car owners can use a coin for a quick test. Additionally, scratches on the tire sidewall are more dangerous due to the thinner wall; shallow scratches might be temporarily acceptable but require inspection for potential cracks or air leaks. Tires older than 6 years also pose safety risks, so monthly visual checks, including tire pressure and overall condition, are recommended. In terms of safe driving, insufficient grip leads to longer braking distances, increasing the risk in emergency situations.

[CamilaLynn]

As a new driver, I was particularly concerned about tire safety. That time when my tire got a scratch, I immediately looked up information: if the scratch depth reveals the inner metal or cords, roughly over 2 mm, the tire must be replaced immediately. Otherwise, it might blow out at high speed. Wear below 1.6 mm tread depth is also unsafe; you can use the coin test—insert it into the groove, and if the national emblem is fully visible, it means it's too shallow. Tires have small raised wear indicator bars; when they are flush, it's time to replace them. When checking, gently feel the depth with your fingers, but it's best to have someone knowledgeable confirm it. Additionally, if the scratch bulges or the edges crack, even if it's not deep, deal with it as soon as possible. New drivers shouldn't skimp on small expenses; changing a tire can ensure safety on the road. I often check my tires during routine maintenance.