What Does it Mean When Someone Bleeds Their Tyres?

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What Does it Mean When Someone Bleeds Their Tyres?

Tyres are an integral part of every motor vehicle. They are used for enhanced vehicular performance, and they provide traction between the vehicle and the road surface, along with providing a shock-absorbing cushion for passenger comfort. Pneumatic tyres of today are typically made up of natural rubber, synthetic rubber, carbon black, and other chemical compounds. 'Bleeding' the tyres means adjusting, often by reducing, the pressure in tyres at a set temperature. Bleeding should not be performed on warm tyres. One should only bleed the tyres when the tyres are cool. Bleeders are used to relieve excess air pressure that builds up due to the heating of the tyres.

Knowledge of tyres, tyre bleeders, bleeder settings, the effects of temperature, and various care tips are all necessary for a buyer to make an informed purchasing decision. Tyres, bleeders, and other relevant accessories can be acquired from automotive stores as well as online. eBay offers a diverse collection of tyres and accessories in a number of sizes, styles, and price ranges.

Tyre Bleeder Setting Tank

The importance of bleeders is especially recognised when one sets one wrong. The tyre pressure of a vehicle should preferably be the same at the beginning and the end of a drive. A tyre bleeder setting tank is a handy device that ensures this. It is a tool that ensures bleeder accuracy and makes it easier to set the tyre bleeders. A rider is simply supposed to fill the tyre bleeder setting tank with compressed air, and then using the attached relieve valve, 'bleed off' the pressure till the gauge registers the desired pressure to be maintained. Then the bleeders can be popped in and adjusted accordingly. Some tanks even have a holding tray for bleeders, which is quite useful when servicing them.

Bleeder Setting Tips

Due to the normal heating of tyres, excess air pressure can build up inside the tyres. Bleeders relieve this excess pressure. The setting of relief valves is critical to the functioning of bleeders. The adjustments are easy to make by simply loosening the jamb nut and turning the cap. A looser cap setting allows a lower pressure setting, while a tighter cap allows a higher pressure setting.


Consistency is an important aspect for setting the bleeders. The relative accuracy is increased in the long run, and the adjustments are more reliable when carried out the same way every time. It is desirable to keep the tyre pressure a few pounds more than normal pressure when making any adjustments. This allows one to loosen the cap until the maximum flow of air is heard. The next step is to turn the cap slowly and gradually until the air stops completely. To reach an exact pressure, the cap adjustment can later be fine-tuned, as well. The practice of slowly tightening the cap and allowing the air to flow freely is a recommended way of going about things as this reduces the chances of improperly setting the pressure.


In order to see whether the air has stopped coming out of the bleeder completely, a small amount of glass cleaner can be sprayed on the opening. When the bubbles stop, one can be sure that the opening is sealed. At times, it is next to impossible to hear the airflow due to other ambient noises, and a visual is particularly helpful in such a case. It is important to know that while setting the bleeders, even small amounts of air flowing out of the valve can lower the pressure. Precision when setting the valve is critical.

Bleeder Maintenance

Bleeder maintenance is also necessary for consistent results. For people who regularly maintain the valves, simply cleaning them with a damp rag is more than enough. Cleaners can damage the rubber seal, and their use is not recommended. A factory installed screen is helpful in preventing dirt from entering the valve.

Spring Inspection

Spring inspection is also an important part of the overall inspection. Be sure of the squareness of the spring and that the ends are free of any burrs. If there are any burrs, file them off. For consistency and getting repeatable settings, the use of white grease or graphite on the ends of the springs is often recommended.

Spare Bleeders

It is a good idea to keep some spare bleeders in the tool box with marked preset pressures. They can be plugged into a Quick Change Adaptor, which is great for last minute changes. Valves can also be set on the wheels when presetting is also an option. The use of a shim should not be underestimated, especially if the valve is to hold higher pressures. Bleeder springs are supposed to be square, and stretching them is never a great idea as it distorts the spring. As a result, the valve functioning becomes very unpredictable.

Tyre Care

The tyre pressure should be checked after every 1,600 km at a time when the tyres are cold. For achieving recommended pressure, one should never bleed the tyres when they are warm because, as a result, when the tyres cool down, they are under-inflated. Using a rag that is lightly dampened with petrol, one can wipe off any oil, grease, or dirt to keep tyres looking new.

When acquiring or planning to acquire new tyres, it is an important consideration that the rest of the tyres on the vehicle are of the same type. The characteristics of tyres vary a lot, and it is a recommended practice that all tyres, including spare tyres, be changed at one time. If the replacement tyres cause any trouble, manufacturers should be contacted or the user manual should be referenced.

Effect of Temperature on Tyre Pressure

It is a universally known fact that air expands when heated. In the case of tyres, as the tyres warm up, the tyre pressure also increases as a result. By the same token, the pressure increases more in hot weather than in cold weather. High speed also affects tyre temperature and pressure. When the tyres are warm, the pressure should not be reduced to the standard pressure. Bleeding the tyres causes the temperatures to climb higher, and when the tyres are cool, they are then under-inflated.

The rate of tread wear is also dependent on the speed. Tread wear may be twice as fast at 80 kph than it is at 50 kph. Due to more deflections per minute, high speed causes increased temperatures. As the temperature of the tyre increases, the resistance of the tread to abrasion decreases.

Inflation Pressure

Clear evidence on the tread is left behind if the under-inflation is persistent and severe. The temperature and friction in the casing are excessive, and this leads to structural failure. The tread life is reduced by higher than recommended pressure levels because the load is concentrated on a smaller tread area. Other disadvantages of excessive inflation pressure include increased susceptibility to cuts and impact fractures and the overstraining of the casing, which causes more rapid wear.

How to Buy Tyres on eBay

Tyres, bleeders, and other related accessories can easily be acquired on eBay. Use the search bar on the eBay home page to begin the hunt for the desired product. Always look in your vicinity first since finding items locally can save you a lot of money on delivery charges. This can be done by entering your postcode as a filter. As soon as your transaction is successfully processed, you can pick up your item from the seller at a convenient time. Depending on what you are looking for, possible search terms include tyres and bleeders.. For some queries, eBay also suggests related searches that can facilitate the purchasing process and help you find what you need. You can always filter the results based on your personal preferences by simply selecting various options. You can also sort the results by price and other methods.

It is also a recommended practice to go through the feedback of the seller and reviews of the product to gain some buying insight and avoid regrets.


Tyres not only fit around the rim of a wheel to protect it, but they also enhance the performance of vehicles. They provide a flexible, shock-absorbing cushion that ensures passenger comfort and traction between a vehicle and the surface of the road. Most of the pneumatic tyres of this century are made of natural rubber, synthetic rubber, fabric, wire, and other chemical compounds. The job of tread is to provide traction, while the body contains the compressed air.

Someone who is 'bleeding' tyres is adjusting, generally by reducing, the tyre pressure at a particular temperature level. Bleeding is typically performed at cold temperatures for stability. Any excess pressure that is built up due to the heating of tyres is relieved by bleeders. Knowledge of tyres, bleeders, bleeder setting tanks, and the effects of temperature on tyre pressure is necessary for a buyer to make wise purchases. eBay features a huge collection of tyres, bleeders, and related accessories in numerous associated variants, and local automotive and tyre shops stock a certain amount of inventory, as well.

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