The function of radial tires for automobiles
The radial tire of a car is a mainstream tire structure in modern times. Its core feature is that the tire carcass lines are arranged along the meridian direction (i.e., at a 90° angle to the centerline of the tread)， and it is equipped with a belt layer (usually composed of steel wires or high-strength fibers) to secure the carcass， thereby significantly enhancing the tire performance. Its main functions can be summarized as follows：
Core Function
Supporting the vehicle load: The tire carcass's radial structure can efficiently withstand internal pressure and external load， providing stable support.
Transmitting driving force， braking force， and steering force： Through the contact with the ground via the tread patterns， it realizes the force transmission for acceleration， braking， and steering operations.
Buffering road impact： The radial elasticity of the tire carcass is good， which can absorb vibrations from uneven roads， improving ride comfort and reducing damage to vehicle components.
Enhancing adhesion and handling stability： With a large contact area and uniform pressure distribution， it improves grip， especially shortening braking distances on slippery roads.
Key Advantages of the Structure
Longer service life
The belt layer limits radial deformation， resulting in more uniform tire tread wear and a mileage that is 30%–50% higher than that of bias tires.
Low rolling resistance and good fuel economy
The fewer ply layers and lower heat generation result in a 8%–10% reduction in rolling resistance， saving 5%–12% fuel consumption.
Stronger load-bearing capacity
The tire carcass帘lines are fully utilized， with a load-bearing capacity 10% higher than that of bias tires； even all-steel radial tires can bear up to 1800 kg.
Higher safety
The steel belt layer forms a "shield"， with strong puncture resistance， and can still allow the vehicle to travel at low speeds for 100–200 kilometers (some models without inner tubes) after being punctured.
Good heat dissipation performance， with a tire temperature 15–20°C lower than that of bias tires when driving at high speeds， reducing the risk of tire blowouts.
Comfort and environmental performance
Noise reduction and vibration absorption， reducing interior noise by 5–8 decibels； optimized rolling resistance reduces exhaust emissions and complies with environmental standards such as Euro 6B.
Types and application scenarios
All-steel radial tires： The carcass and belt layer are both steel wires， used for heavy-duty vehicles and construction machinery.
Half-steel radial tires： The carcass is fiber， and the belt layer is steel wires， widely used in cars， light trucks， and buses.
All-fiber radial tires： The tire carcass帘lines are all made of artificial fibers， used for low-speed vehicles and tractors.
Notes： The sidewall of radial tires is thinner and should not be driven at high speed on bumpy roads； avoid mixing with bias tires； inflate according to the standard pressure and rotate regularly to balance wear.
Radial tire failures can be mainly classified into two categories： usage reasons and manufacturing reasons. Based on the latest publicly available information as of April 2026， combined with common failure manifestations and causes， the following is compiled：
Common Fault Types and Manifestations
Tread interior faults (common in all-steel radial tires)：
Internal cracks： Radial cracks in the tread interior， with severe cases resulting in a "U"-shaped burst on the outside.
Tread interior overheating： Foaming， delamination of the inner liner， or gelation and detachment of the rubber.
Deflation-induced abrasion： Delamination of the inner liner or detachment of the rubber along the circumferential direction.
Foreign object damage： Scratches on the surface of the inner liner (rare in new tires).
Strake detachment： Bulges and cracks at the ends and interfaces， tearing of the interface.
Tread crown/tread shoulder/tread side faults：
Tire blowout： Rapid air loss (puncture) or chronic air loss (poor repair， aging valve stem).
Blistering： Tread side or shoulder fracture due to impact.
Abnormal wear：
Intermediate wear → High air pressure；
Single-sided uneven wear → Incorrect front wheel alignment (excessive camber/anti-squat)；
Wave-like/feather-like wear → Loose vehicle components or poor dynamic balance.
Bleeding/Scoring: Occurs when driving on gravel roads or being scratched by sharp objects.
Stripping/Bursting: Caused by overloading, sharp turns, or cuts to the tire sidewall.
Blowout (common in load-bearing tires): Caused by overloading, sharp turns, or cuts to the tire sidewall.
Blowout Hole (common in load-bearing tires): The tire cord separates from the tire body when pressed, giving a "bubbling" sensation. This is usually caused by a mismatched rim, high temperature, improper assembly, or design flaws.
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