When you consider the engineering effort embodied in tires, you realize that these tires, especially truck tires, are truly ingenious engineering. They are black rubber rings with internal components like metal wires, filled with air, yet they are simply the crucial element in transferring power from the engine to the ground. They interact with the steering wheel and driver to execute commands for turning right and left, making them an unparalleled vital component. Bearing all these responsibilities, they are also the most susceptible to damage, wear, and failure. Therefore, it is essential to learn how to perform regular maintenance on these tires, particularly truck tires, as they are more critical and pose greater risks in terms of accident types and their massive scale, in addition to the large size of trucks and the heavy loads they carry and transport from one place to another. This means that neglecting these tires increases the danger on the road for yourself first and foremost, and for others as well. Globally, accidents resulting from truck collisions cause the most damage and material and moral losses.
Tires can be an economical solution for many logistics companies by fulfilling their purpose: ensuring trucks run more smoothly and efficiently. However, if neglected, they turn into ticking time bombs, and operating on them costs logistics companies and individuals a hefty price. Downtime due to maintenance can amount to several daily trips, meaning a truck stopping for maintenance or tire replacement incurs significant annual financial losses. Therefore, it is best to invest in regular tire maintenance and perform the checks we will discuss in later sections of this article, which will introduce you to the types of inspections, how to perform them, and how to avoid sudden tire failure.
The engineering effort invested in tire manufacturing relies on regular maintenance and continuous sustainability for its preservation.
The Tire: Your Only Point of Contact with the Road – What Are Its Components?
To understand why we must maintain tires, we need to know their components, especially modern tires, which are made up of many superimposed layers and chemical elements. Therefore, we will discuss each tire component separately and in detail, starting progressively from the inside out.
- The Inner Liner: This is a thick, airtight rubber layer designed to maintain internal air pressure more effectively and with high durability, genuinely resisting its leakage, while enhancing the flexibility and strength of the tire walls and overall structure.
- Carcass Plies: These layers are the internal supporting component of the tire, consisting of polyester, nylon, rayon fibers, or steel (in radial plies). The structural layers are considered the backbone of the tire, holding it from all sides and providing special protection against punctures and disintegration. They also play a primary role in determining the tire's load-bearing capacity for the weights carried by the truck, while protecting the tire from blowouts during rotation, sharp turns, and extreme pressure. The way these layers are woven and oriented radially or diagonally determines the tire's fundamental characteristics in terms of stiffness and ride comfort.
- Steel Belts: These are layers of steel wires or made from strong, rigid materials and alloys, wrapped around the tire's circumference in various patterns, including radial and diagonal. Their primary function is to stabilize the tread layer responsible for the tire's contact with the road. Their role becomes more critical at high speeds, as they are responsible for the grip of the direct road-contact layer, in addition to preventing deformation under heavy loads and enhancing puncture and indentation resistance, along with uniform distribution of pressure and heat.
- Sidewalls: These walls are considered the most flexible area of the tires, as they are made of rubber designed to resist compression and tension. This allows the tire to flex and bend more flexibly than other areas of the tire. Additionally, they contain important tire-related information such as the manufacturing year, tire type, quality, and other information specifically relevant to the customer.
- Tread: This area is the most exposed to friction with the road. It is made of reinforced rubber materials to ensure extreme strength and rigidity, while its design must effectively provide ground balance. It also features grooves and channels carved into the tread to be more effective against water, mud, and liquids that typically cover roads, all to prevent truck skidding and horrific accidents.
- Shoulders: This is the transition point between the tread area, which directly contacts the road, and the sidewall area, which holds the tire from the sides. They work to strongly connect these two areas, resisting immense stresses during cornering, and play an important role in dissipating the heat generated by the tread's friction with the road.
- Beads: These are very rigid steel wires encased in rubber on all sides, using a strong type of rubber reinforced with hardening agents. They are designed to provide a tight seal with the metal rim flange, preventing slippage or air leakage under immense centrifugal forces.
These intricately interconnected layers enable tires to interact with dozens of environmental and climatic variables, such as cold, heat, heavy loads, high speed, and different road types, which can lead to premature damage and sequential failures. Darbk Tires is committed to providing tires made from extremely strong compounds with the highest specifications and quality, to withstand the harsh climatic conditions in Saudi Arabia.
A tire's components determine whether it is a high-quality product or a commercial tire that wears out quickly!
Visual Inspection: Your First Line of Defense
Daily monitoring and visual inspection don't require extensive equipment or tools, just visual observation. Even experience and knowledge aren't crucial; what's important is the discipline of performing it before trips and daily. The steps begin as follows:
First: Quick Visual Check: Start by inspecting the tire from the side, examining the sidewall for cracks or abnormal bulges like bubbles or egg-shaped distortions. If present, these are an unmistakable sign of a tear in the inner layers or steel belts. This usually occurs due to a severe impact with a pothole, curb, or speed bump. Such a sidewall bulge is extremely dangerous and could burst at any moment, causing the truck to become immobilized.
Cracks, on the other hand, are small lines or networks that also appear on the sidewall, particularly around the shoulder area and rim edge. They are a prominent sign of tire aging and approaching the end of its service life. Causes include severe tire drying combined with very heavy loads, and excessive exposure to UV radiation. This can be accompanied by other visible damage such as peeling or sharp cuts due to the tire being subjected to numerous impacts and changing conditions that cause it to gradually disintegrate and fail.
Second: Uneven Wear: Run your hand over the tread area and inspect it carefully for uneven wear, where one area is more worn than another, or if one area feels smoother than the rest. This indicates issues with the caster or camber angle, which are related to proper wheel alignment and steering, or it could mean the suspension system is fatigued and experiencing multiple problems.
Additionally, you might find foreign objects stuck in the tire grooves. Try not to remove them directly, as they could cause a puncture and a leak in the tire. These objects could be screws, nails, etc. Therefore, you should go to a tire service center to have the tire repaired and to find the best way to fix it and restore it to its original condition.
Third: Light Kick (Preliminary Pressure Test): This test cannot replace an air pressure check, but a kick can indicate if tires need refilling or if their air level has dropped. This procedure helps you avoid driving on over-inflated tires and tires with a hidden or unnoticed leak.
Fourth: Listening to the Tire: While driving at low speeds, try listening to the tire sounds, as a loud noise or unusual clicking is an important sign of tire malfunction. You should investigate this to determine the cause or source of the sound coming from the tires, which could indicate uneven wear, gravel stuck in the tire grooves, or something similar.
The first proper line of defense for tires is to buy them from a company that carries the Saudi Quality Mark!
Air Pressure Check: Daily or Monthly?
Air pressure is considered the lifeblood of tires; it is the biggest factor in a tire's longevity, performance, and safety. Incorrect pressure can be destructive to both the truck and the tire, affecting how it absorbs impacts and the suspension system's ability to handle them, in addition to influencing tread wear patterns.
The effects of pressure on the tire begin with the air pressure inside determining its grip on the road and stability on straight surfaces. The contact patch with the road changes according to the air within the tire. When air pressure is low, the contact area increases, leading to higher tire temperatures, which raises the risk of the tread separating from its reinforcing layers, such as steel belts. Conversely, excessive air pressure in the tire can reduce the contact area between the tire and the road, making friction more concentrated and reducing the tire's ability to absorb bumps and impacts effectively. It's important to note that fuel consumption is significantly affected in both scenarios: with low air pressure, fuel consumption increases by at least 20% above normal levels, whereas optimal air pressure minimizes rolling resistance, leading to lower fuel consumption. However, excessively high pressure inside tires can cause major problems or even lead to a blowout. Therefore, it is recommended to adjust air pressure according to the load and the type of road the truck travels on, in addition to adhering to the standard specifications set by tire manufacturers and truck manufacturers.
How to Correctly Measure Tire Air Pressure?
Tire pressure is measured using a pressure gauge, which must be high-quality and very accurate. Ensure the correct procedure is followed: the tire must be cold, meaning the truck should have been stopped for at least three hours. Measurements taken after driving often show a higher pressure than the actual pressure. When performing the check, you must know the correct tire pressure. To find the true required tire pressure, do not rely on the number written on the tires themselves; instead, check what is written in the driver's cabin, as the truck manufacturer is more specialized and knows the specific weight of that truck. The practical steps, which everyone knows, can be summarized as follows: Open the valve cap, firmly attach the pressure gauge nozzle, read the pressure in PSI. If the pressure is low, connect an air compressor and raise the pressure to the standard level specified by the manufacturer. If it's too high, partially or fully remove the gauge, then press the valve to release air. Release a small amount, then recheck to avoid losing too much pressure. Finally, ensure the valve cap is fully reinstalled. Don't forget to check the air pressure in the spare tire, as it is very important in emergencies.
Furthermore, it's important to note the effects of environmental factors on tire pressure. Hot weather increases the pressure level inside tires, meaning you should reduce the air pressure early in the morning to prevent internal pressure from reaching high levels. In cold weather, the internal tire pressure naturally experiences a noticeable drop due to the contraction of air molecules inside the tire. This means you might need to inflate the tires with more air during winter and in extremely cold regions, in addition to the effects of humidity, which also impacts the air level inside tires. During long journeys, tires automatically heat up due to friction with the road.
Checking Tread Depth
The tire tread, which is part of the tire's contact area, is the primary defense against skidding, punctures, and other road-related issues. Therefore, tread depth should be measured periodically to determine the actual depth of the tire grooves, which are responsible for draining water and other debris. This measurement is typically performed by workshops specializing in routine tire maintenance. Among the tools that should be used in these workshops is a Tread Depth Gauge, which is one of the best and most accurate tools for this purpose. It's a small, ruler-like tool with a sliding needle, placed in one of the main grooves, and the measured value is recorded at multiple contact points on the tire tread. Alternatively, a simple manual check can be done using a coin by inserting it vertically and noting the distance covered by the groove. If the tread depth exceeds half the coin, it is still safe for use. However, if it is less than that, the tread depth is no longer suitable for driving.
Furthermore, tire manufacturers incorporate wear indicators to determine the level of tread wear. These are small, slightly raised rubber bars located at the bottom of the main grooves across the tire. When the tread wears down to the level of these indicators, it signifies that the depth has reached 1.6 mm, which is the legal limit for usable tread depth on roads in Saudi Arabia.
Semi-Annual Truck Inspection
Trucks rely on their tires for a long period, averaging five years. However, a comprehensive inspection of all truck components must be conducted every six months to assess the truck's operational condition and its roadworthiness. Key inspections required during the semi-annual check include assessing wheel balance and the quality of the suspension system. Additionally, ensuring proper wheel alignment by adjusting steering angles is crucial. This comprehensive inspection also covers the tires, meaning the overall condition of the truck directly impacts and is impacted by its performance on the road.
When Should Truck Tires Be Replaced?
The ideal time to replace tires cannot be determined absolutely. However, attention must be paid to visible signs of wear on the tires, in addition to their lifespan, which typically ranges between 2-5 years. This timeframe is considered a maximum, especially for tires on commercial transport trucks, which experience greater wear due to infrequent stops. Furthermore, the signs indicating tire wear are the decisive factor, regardless of whether the tires are newly installed or have not been used for a long time.
