What are the criteria for tire replacement?

[DeAsher]

Tire replacement criteria are as follows: 1. Technical standard: When tread grooves are less than 1.6MM, tires should be replaced. If the tread wear indicator is exposed, it indicates that the groove depth is less than 1.6mm. The tread wear indicator is the raised part in the groove. Using tires with remaining groove depth below 1.6mm may result in sudden loss of traction and braking force in rainy conditions, as well as complete loss of traction in snowy conditions. 2. Tread standard: Tires that have been punctured more than 4 times on the tread; tires with punctured or damaged sidewalls; tires with tread punctures exceeding 4mm in diameter; tires with punctured shoulders. The sidewall rubber is thinner, and if the puncture hole is large or the rubber surface shows extensive rough granulation or bulging deformation, immediate replacement is necessary to prevent blowouts. 3. Mileage standard: Based on road conditions, 30,000-50,000 kilometers. For smooth asphalt roads, 50,000 kilometers; for rough gravel roads, 30,000 kilometers. When exceeding 30,000 kilometers, the tread friction coefficient is less than 50. In wet or snowy conditions, the tread's water drainage function decreases or is lost, with a friction coefficient below 15, making gravel roads prone to blowouts.

[VanMarcus]

When changing tires myself, I mainly focus on three key indicators. If the tread depth is below 1.6mm, it's time to replace them - just insert a coin into the tread grooves, and if the outer rim becomes visible, the tread is too thin. Also be wary of bulges or cracks on the tire sidewalls; a blowout at high speeds is no joke. Don't blindly follow age limits - my neighbor's imported car tires developed cracks all over after just five years, while my domestic tires are still fine after seven years. It mainly depends on parking conditions and usage intensity. Last month when I changed tires, I encountered an interesting situation: the left front tire showed severe uneven wear, which turned out to be caused by misaligned wheel positioning. So remember, don't just focus on wear indicators - hidden factors like wheel deformation or having more than three tire repairs should also be considered.

[LaWeston]

Last time when I helped my bestie check her little Polo, I realized some details female car owners often overlook. Not only were the tire grooves packed with small stones, but she hadn't even noticed the tread was nearly worn down to the safety indicators. Actually, tire lifespan is shorter than imagined - if you frequently drive on highways, you should be prepared to replace them after 50,000-60,000 km. A mechanic taught me a trick: park side by side and check if the tires show 'peeling', surfaces that look like they've been shaved by a knife should never be ignored. Pay special attention to sidewall scratches - hidden damage from scraping against curbs can be the most dangerous time bombs. There was a BMW in our neighborhood that skidded and hit guardrails during a rainy turn because of unreplaced bulging sidewalls. Spare tires are silent killers too - a full-size spare left untouched in the trunk for three years had its rubber hardened like a brick.

[StSteven]

Modification enthusiasts truly understand how tire condition affects performance. After five years, grip plummets drastically - rainy day braking distance can extend by half a car length. Check these performance tire wear indicators on mine; when worn down, cornering noise becomes muffled. Once at a track day, a fellow racer had uneven tire wear with tread looking diagonally shaved off - turned out to be caused by leaking shock absorbers. Never underestimate patch counts - tires with over three patches lose balance, causing steering wheel vibrations above 50mph like smartphone alerts. Wide tire users must inspect frequently - mismatched wheel sizes make sidewalls bulge like pregnancy.