How often do tires need to be changed

The replacement cycle of tires should be comprehensively judged based on the service life, mileage, wear degree, damage situation, and usage environment. The following is a professional evaluation framework and decision-making recommendations:

1、 Core judgment criteria and critical values

Evaluation Dimension Critical Value/Judgment Basis Direct Suggestions

Service life 5-8 years (from production date, not installation date) ▶  Professional testing is required annually for over 5 years

▶  Must be replaced after 8 years (even if mileage has not been reached)

Driving range of 60000 to 100000 kilometers (significant differences among different types of tires) ▶  Economy tires ≤ 60000 kilometers

▶  Silent/sport tires ≤ 80000 kilometers

▶  Wear resistant tires ≤ 100000 kilometers

The remaining groove depth due to tread wear is less than 1.6mm ▶  Braking distance extended by more than 40% on rainy days

▶  Winter snow/water accumulation road sections are prone to losing control

Damage type: bulging/cracking/sidewall scratches/multiple tire repairs ▶  Immediate replacement for sidewall injury

▶  Single tire repair ≥ 3 times, replacement required

▶  The bulging tire may burst at any time

Environmental impact: In areas with high temperature, sand and gravel, and strong ultraviolet radiation, the lifespan needs to be shortened by 20% -30% ▶  Hainan/Xinjiang and other regions suggest replacing it every 5 years/60000 kilometers

▶  Urban commuting can be extended to 8 years/80000 kilometers

2、 Guidelines for Decision making by Scenario

1. Daily commuting scenarios

Typical features: Annual driving mileage of 10000-20000 kilometers, mainly on urban paved roads

Replacement cycle:

Tire type: Economy tire (such as Chaoyang SA37)

▶  Recommended 60000 kilometers/5 years for replacement

Tire type: Silent and comfortable type (such as Michelin Haoyue 4)

▶  Recommended 80000 kilometers/6 years replacement

Key inspection items: Check for sidewall cracks and uneven tread wear every 20000 kilometers

2. Business operation scenarios

Typical features: Daily driving mileage>300 kilometers, heavy load/high-frequency start stop

Replacement cycle:

Tire type: Wear resistant truck tire (such as Bridgestone R150)

▶  Recommended for replacement every 500000 kilometers/3 years (monthly replacement required)

Tire type: Taxi specific tires (such as Goodyear durable+)

▶  Recommended 400000 kilometers/2.5 years replacement

Risk Warning: Abnormal shoulder wear (>1.5mm/10000 kilometers) requires immediate four-wheel alignment

3. Special working condition scenarios

Type of working condition, replacement cycle, mandatory replacement conditions

Off road/unpaved road 30000 kilometers/2 years ▶  Tire surface embedding>3mm gravel

▶  The sidewall was cut by a sharp stone

10-15 full throttle track days for track competition ▶  Significant particle detachment on the surface of the hot melt tire

▶  Peak tire temperature>120 ℃

4 years/60000 kilometers in low-temperature ice and snow areas (winter tires) ▶  The thickness of the hard rubber layer on the tread is less than 3mm

▶  Snow traction decreases by more than 30%

3、 Self checking methods and tools

1. Self inspection of tread wear

Coin testing method:

Insert a 1 yuan coin (emblem face) vertically into the main groove. If the complete chrysanthemum pattern can be seen, the groove depth should be less than 1.6mm and it needs to be replaced immediately.

Wear mark recognition:

The "Δ" or "TWI" raised mark in the tread drainage groove must be replaced when the tread is level with it.

2. sidewall injury detection

Visual inspection:

Use a flashlight to shoot diagonally at the sidewall of the tire and observe for transverse cracks greater than 3mm or deep scratches greater than 1mm.

Drum determination:

If the tire sidewall is locally raised by more than 2mm or there is a sponge like sensation when pressed, it indicates that the curtain layer is broken.

3. Professional testing recommendations

Testing items:

▶  Dynamic balance detection (correction required for>10g)

▶  Uniformity testing (attention should be paid to radial force fluctuations>50N)

▶  X-ray flaw detection (detecting cord breakage)

Detection cycle:

▶  Ordinary vehicles: Every 2 years or 40000 kilometers

▶  High performance vehicles: every 1 year or 20000 kilometers

4、 Dispute resolution

Does the tire need to be replaced if it has not been used for more than 3 years since its production date

Conclusion: Replacement is required

Principle: Rubber materials undergo continuous oxidation reactions during storage. Even if not used, after 3 years, the elastic modulus decreases by 15% -20%, and the sidewall impact strength decreases by more than 30%.

Is it feasible to replace only the two coaxial tires

Scenario based suggestions:

▶  Acceptable: The remaining groove depth difference of coaxial tires is ≤ 1mm, and the production date difference is less than 1 year

▶  Need to avoid: mixing tires of different brands/patterns (braking distance can vary by up to 20% on rainy days)

Can explosion-proof tires (RSC) extend their service life? "

Key data:

▶  Although the sidewall strength of explosion-proof tires is high, their thermal aging rate is 25% faster than that of ordinary tires

▶  Recommended replacement cycle: 5 years/50000 kilometers (whichever comes first)

5、 Decision tree and priority sorting

Safety red line:

▶  Tire sidewall injury>1mm → Replace immediately

▶  Tread groove depth<1.6mm → replace within 30 days

▶  Service life>8 years → replacement within 7 days

Economic ranking:

▶  Prioritize replacing severely worn tires (usually drive wheels)

▶  When the difference between coaxial tires is greater than 2mm, they need to be replaced in pairs

Performance optimization:

▶  When replacing, it is recommended to choose the same tire as the original one:

Rolling resistance coefficient deviation<5%

Wetland land grabbing index (G level) consistent

Noise level deviation ≤ 1dB (A)

Ultimate suggestion:

Establish electronic tire records (including production date, installation date, mileage record, and testing data), and monitor them in real-time through the Tire Pressure Monitoring System (TPMS). When the tire meets the following conditions simultaneously, it must be replaced:

▶  The service life is ≥ 5 years and

▶  Driving mileage ≥ 60000 kilometers or

▶  Tread groove depth<2mm or

▶  Structural damage occurs

Attention: For scenarios with strict safety requirements (such as passenger cars with more than 7 seats and hazardous chemical transport vehicles), it is recommended to adopt a "4+2" replacement strategy - that is, the main tire is converted to a spare tire after 4 years of use, and the spare tire is forcibly scrapped after 2 years of use.