Tyres are ring-shaped protective coverings around the wheels of a vehicle that can either be pneumatic or solid. They are generally made of rubber or plastic composite, and they enhance vehicle performance. Pneumatic tyres are mostly made of fabric and wire, natural rubber, carbon black, and other compounds. The fundamental purpose of tyres is to provide traction between the surface of a road and a vehicle while at the same time also providing a cushion to absorb the shock.
Knowledge of the various tyre buying considerations is imperative for buyers to make informed decisions. Tyres of various sizes, materials, and purposes can be acquired from the very diverse eBay marketplace. The site boasts a huge collection of tyres in a number of sizes, styles, and quality levels, and the site also offers a great Deals section that features other automotive items, as well.
Tyre Buying Guide
Tyres are one of the most important parts of any vehicle. Knowing the various components and the performance characteristics of a set of tyres is always a good idea before making any purchasing decisions. Tyres are the only part of a vehicle that comes in direct contact with the road surface. Making sure that the rubber on tyres is in good condition at all times is an extremely important safety measure. The tyre quality also affects the overall running cost of a vehicle. For example, the amount of tyre wear proportionally affects the way a vehicle performs and handles on the road.
No matter how good a set of tyres is upon purchase, there comes a time when a user is compelled to change the tyres yet again. When a user intends to purchase new tyres, he or she should know about the various components of a typical tyre in advance.
Components of a Tyre
Due to the extremely simple geometric shape of a general-purpose tyre, people might think that it does not have many components, but that is not true. A tyre has many critical components, each with its own function.
Tread is the part of a tyre that comes in direct contact with the road surface. It is generally a thick rubber that provides plenty of traction but does not wear away easily. The 'contact patch' is the specific portion of the tyre that is in contact with the road surface at any particular point in time. 'Void ratios' for high performance tyres are small. This allows for better traction in most driving scenarios. However, in order to channel away excessive mud, rain, and snow, mud and snow (M&S) tyres have higher void ratios.
The area of a tread design that contacts the road surface to provide traction is known as tread lug. It is compressed upon entering the road contact area (footprint). A circumferential deformation takes place when the tread lug rotates through the footprint. As soon as the tread lug leaves the footprint, it resumes its original shape. The term 'force variation' is used to describe the variable forces exerted on the vehicle during the compression and recovery cycle.
The spaces between the lugs that enable them to flex and evacuate water are known as tread voids. Lug sizes are kept non-symmetrical in order to reduce the noise levels at certain frequencies. Rainwater, snow, and mud can easily be channelled away from the footprint, courtesy of the tread voids. The void area of a tyre when divided by the total tread area provides the user with the void ratio.
The rain groove is a design element of a tread pattern. Its primary purpose is to channel water away from the footprint. Rain grooves run circumferentially throughout the tyre. In various high performance tyres, rain grooves are angled outwards from the centre. Tread flexing results in the active pumping out of water from beneath the tyres, and this results in a smoother ride on wet roads.
Sipes are simply the valleys cut across the tyre, generally at right angles to the grooves. They help with the escape of water from the grooves so that hydroplaning is avoided. The overall geometry helps reduce stress in the lug and heat build up. Siped off-road tyres are popular with off-roading enthusiasts, and many manufacturers are now offering siped tyres.
Performance Characteristics of a Tyre
The overall performance of a tyre is a function of several variables. The interaction of a tyre with the surface of the road is a detailed process that requires a lot of research to fully understand the different performance characteristics. For one thing, tyre balance is an important consideration. Automatic tyre balancing machines check tyres for excessive dynamic imbalance and static imbalance. Any imbalance is corrected by applying weights to the wheels to counteract the tyre imbalance.
Centrifugal forces that are acting outwards on a moving tyre tend to increase the diameter of the tyre by pushing the tread rubber away from the axis of rotation. As a result, a speedometer error may occur. Also, the tyre can rub against the vehicle at high speeds due to centrifugal growth.
A tyre deforms flat to conform to the roadway when it comes in contact with the road surface. The resistance to rolling caused by this deformation is called rolling resistance. In order to improve the fuel economy, especially in trucks, manufacturers strive for lower rolling resistance values. Pneumatic tyres generally have lower rolling resistances than solid tyres.
The behaviour of a tyre under load is termed the load sensitivity. For pneumatic tyres, as the load on a vehicle increases, the friction decreases, which is in direct contrast to the classical friction theory. A tyre can prematurely fail to perform correctly if it is put under undue stress. Therefore, it is necessary to measure the workload placed on a set of tyres. Ton kilometre per hour (TKPH) is the common unit for measuring workload. For the mining industry, TKPH is an extremely important parameter to consider, but it does not typically play a key role in general consumer tyre usage.
Buying Tyres on eBay
You can begin the search for tyres on the eBay site by locating the search bar on any page. Enter a search query to see relevant results, and then sort the results based on your preferences. You can also narrow the results by selecting one of the various filters. Some possible queries to consider include tyres, pneumatic tyres, and mud and snow (M&S) tyres. For some queries, a few related searches are suggested by eBay to help you facilitate the buying process.
Consider beginning the hunt locally to avoid delivery charges. This can simply be done by entering your postcode. If you do find the desired tyres or accessories nearby, you can pick them up from the seller at a convenient time and possibly even have them installed. Do not forget to go through the feedback and reviews for a seller before placing your order.
Tyres are a compulsory component of virtually every vehicle on the planet. Generally made of a plastic composite or rubber, tyres are either pneumatic or solid in construction. Other materials used to manufacture tyres include fabric, wire, carbon black, and several other compounds. Tyres of all types provide a cushion to absorb the shock of motion and also traction between the road surface and the vehicle.
Preliminary knowledge of the various components and performance characteristics of a tyre is important before buying. Tyres of all sizes, styles, and price ranges can easily be found with a few mouse clicks on eBay. The site's easy to use search interface is virtually guaranteed to have buyers clicking their way to successful tyre purchases.
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