Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Schrader Valve shopping experience:

1. Compare - without doubt the biggest advantage that the Schrader Valve offers shoppers today is the ability to compare thousands of Schrader Valve at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.

2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about

3. Testimonials - don't know anybody that has bought a Schrader Valve? Wrong! If the Schrader Valve is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.

4. Questions - Got a question about Schrader Valve then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....

5. Reputation - Never heard of the company selling Schrader Valve? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Schrader Valve and build up a picture of their reputation for sales, returns, customer service, delivery etc.

6. Returns - still worried that even after all of the above your Schrader Valve wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.

7. Feedback - happy with your Schrader Valve then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.

8. Security - check for the yellow padlock on the Schrader Valve site before you buy, and the s after http:/ /i.e. https:// = a secure site

9. Contact - got a question about Schrader Valve, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.

10. Payment - ready to pay for your Schrader Valve, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.

tireThe Schrader Valve is a valve stem invented by August Schrader and is used on virtually all automobile tires and wider rimmed (lower pressure) bicycle tires. It is a poppet valve assisted by a spring. Schrader valves are also used on the fuel rail of some direct fuel injection engines and on some automotive air conditioning systems, in a diameter larger than those used on tires, to allow recharging with refrigerant. In addition, Schrader valves are sometimes used on irrigation systems to provide a place to temporarily attach a portable pressure gauge.

The Valve A Schrader valve consists of a hollow cylindrical metal tube, typically brass, with the exterior end threaded. The interior end takes a variety of forms depending on its application. A new development is Schrader valve stems with integrated transmitters for Tire Pressure Monitoring Systems (TPMS).

In the center of the exterior end is a metal pin pointing along the axis of the tube; the pin's end is approximately flush with the end of the tube. Pushing this pin into the valve opens it. There is a spring (device) inside the Schrader valve which pushes the pin outward to close the valve when the pin is released.



The threaded exterior end of the valve is used to attach a hose fitting for pumping fluid (gas or liquid) in through the valve, to momentarily fit a pressure gauge to the valve for measuring the pressure behind it, and to secure a protective cap such as the combined cover seal and installation tool pictured. The illustrated tool is normally only used to removed the valve's core, which rapidly deflates the tire, pursuant to the repair or replacement of a damage or worn-out tire. (Beware: unscrewing valve cores used in high pressure applications, especially applications other than tires (e.g. refrigerants), can be very dangerous.)

Generally, all Schrader valves used on tires have threads and bodies of a single standard size at the exterior end, so caps and tools generally are universal for the valves on all pneumatic tires on automobiles, bicycles, and even lawnmowers, hand trucks and wheelbarrows (at least in the United States). Most air hose fittings for inflating tires, generally referred to as chucks, actually are not threaded; instead, they seal to the threads by compressing a rubber collar around the threads, or they simply seal to the end of the valve tube with a gasket (usually of rubber) which is sealed by manual pressure. For the former type, the threads are still important because they have essentially the same effect as concentric ridges around the valve tube, giving the rubber something to conform around for a firm grip against the force of pressure, which would tend to push the fitting off of the valve. Both tire chucks and tire gauges include a built in fixed pin to depress the valve core's stem as you apply the tool to the valve.

Depressing the pin is also the method for manually relieving the pressure retained by the valve (for example, when a tire is over-inflated or needs to be deflated but the core removal tool is unavailable). As mentioned above, a pressure gauge, when pressed firmly onto the end of a valve, depresses the pin to open the valve so that the pressure inside can be measured. Deliberately not pressing the gauge firmly is a common practice when a tire is to be intentionally deflated.

The Valve Cap A valve cap is essential on a Schrader valve because if one is not fitted, dirt and water can enter the outside of the valve, potentially jamming it or contaminating the sealing surfaces and causing a leak. Rock salt and other chemical deicers used in the winter are especially damaging for the brass components in the Schrader valve.

Metal valve caps usually have, in addition to the handy tool, a small rubber insert to permit a good seal against the valve body; a cap of this kind also helps to prevent air escaping from a slightly leaking valve. However, the vast majority of Schrader valves used for tires are fitted with plain black plastic caps which effectively serve only to keep contaminants out of the valve stem.

There are also special pressure monitoring valve caps available that use a spring loaded piston to raise a green flag when the pressure is at or above the correct setting. Upon losing pressure the green flag is retracted to reveal a red pin, hopefully catching the attention of the owner before fuel is wasted by running the tire under-inflated.

Recently, colored plastic valve stem caps have appeared. Certain automobile tire dealerships are promoting the use of dry nitrogen to inflate tires. Eliminating oxygen and water is said to prolong the life of both tires and wheels. These dealers install green caps to signify that the tires are filled with nearly pure (typically about 95%) nitrogen.

Other vendors are selling caps in a variety of other colors for purely decorative purposes. The decorative category even includes caps that light up when the wheels move.

Presta vs. Schrader As is true for a Presta valve, pressure inside a Schrader valve will hold the valve shut, but because the Schrader valve has a spring, it closes and stays closed even without pressure. Another difference is that the size of Schrader valve used for bicycle tires has a greater diameter than the Presta valve. The spring makes the Schrader valve better than the Presta valve for low pressure tires, but the larger diameter hole it requires can weaken the wheel rim. For this reason, Schrader valves are more common on mountain bikes--which have wider tires with lower pressure--than on other types of bicycles, particularly racing bicycles (which have narrow rims and tires and higher pressure).

A rim drilled for Presta valves may be converted to accept Schrader valves, by drilling it out with a 21/64" drill bit but care must be taken to carefully de-burr the resulting hole to prevent damage to the tire and inner tube.

The Schrader Valve's Dimensions The standard Schrader valve has the following thread:

External Thread

• METRIC: 7.7 mm OD, thread root diameter is 6.9 mm x 0.794 mm pitch.
• IMPERIAL: 0.305 in OD, thread root diameter 0.302 in x 32 tpi (threads per inch)

Internal Thread (the valve core)

• METRIC: 5.30 mm OD x 0.706 mm pitch
• IMPERIAL: 0.209 in OD x 36 tpi.

External links

• Schrader-Bridgeport website

tireThe Schrader Valve is a valve stem invented by August Schrader and is used on virtually all automobile tires and wider rimmed (lower pressure) bicycle tires. It is a poppet valve assisted by a spring. Schrader valves are also used on the fuel rail of some direct fuel injection engines and on some automotive air conditioning systems, in a diameter larger than those used on tires, to allow recharging with refrigerant. In addition, Schrader valves are sometimes used on irrigation systems to provide a place to temporarily attach a portable pressure gauge.

The Valve A Schrader valve consists of a hollow cylindrical metal tube, typically brass, with the exterior end threaded. The interior end takes a variety of forms depending on its application. A new development is Schrader valve stems with integrated transmitters for Tire Pressure Monitoring Systems (TPMS).

In the center of the exterior end is a metal pin pointing along the axis of the tube; the pin's end is approximately flush with the end of the tube. Pushing this pin into the valve opens it. There is a spring (device) inside the Schrader valve which pushes the pin outward to close the valve when the pin is released.



The threaded exterior end of the valve is used to attach a hose fitting for pumping fluid (gas or liquid) in through the valve, to momentarily fit a pressure gauge to the valve for measuring the pressure behind it, and to secure a protective cap such as the combined cover seal and installation tool pictured. The illustrated tool is normally only used to removed the valve's core, which rapidly deflates the tire, pursuant to the repair or replacement of a damage or worn-out tire. (Beware: unscrewing valve cores used in high pressure applications, especially applications other than tires (e.g. refrigerants), can be very dangerous.)

Generally, all Schrader valves used on tires have threads and bodies of a single standard size at the exterior end, so caps and tools generally are universal for the valves on all pneumatic tires on automobiles, bicycles, and even lawnmowers, hand trucks and wheelbarrows (at least in the United States). Most air hose fittings for inflating tires, generally referred to as chucks, actually are not threaded; instead, they seal to the threads by compressing a rubber collar around the threads, or they simply seal to the end of the valve tube with a gasket (usually of rubber) which is sealed by manual pressure. For the former type, the threads are still important because they have essentially the same effect as concentric ridges around the valve tube, giving the rubber something to conform around for a firm grip against the force of pressure, which would tend to push the fitting off of the valve. Both tire chucks and tire gauges include a built in fixed pin to depress the valve core's stem as you apply the tool to the valve.

Depressing the pin is also the method for manually relieving the pressure retained by the valve (for example, when a tire is over-inflated or needs to be deflated but the core removal tool is unavailable). As mentioned above, a pressure gauge, when pressed firmly onto the end of a valve, depresses the pin to open the valve so that the pressure inside can be measured. Deliberately not pressing the gauge firmly is a common practice when a tire is to be intentionally deflated.

The Valve Cap A valve cap is essential on a Schrader valve because if one is not fitted, dirt and water can enter the outside of the valve, potentially jamming it or contaminating the sealing surfaces and causing a leak. Rock salt and other chemical deicers used in the winter are especially damaging for the brass components in the Schrader valve.

Metal valve caps usually have, in addition to the handy tool, a small rubber insert to permit a good seal against the valve body; a cap of this kind also helps to prevent air escaping from a slightly leaking valve. However, the vast majority of Schrader valves used for tires are fitted with plain black plastic caps which effectively serve only to keep contaminants out of the valve stem.

There are also special pressure monitoring valve caps available that use a spring loaded piston to raise a green flag when the pressure is at or above the correct setting. Upon losing pressure the green flag is retracted to reveal a red pin, hopefully catching the attention of the owner before fuel is wasted by running the tire under-inflated.

Recently, colored plastic valve stem caps have appeared. Certain automobile tire dealerships are promoting the use of dry nitrogen to inflate tires. Eliminating oxygen and water is said to prolong the life of both tires and wheels. These dealers install green caps to signify that the tires are filled with nearly pure (typically about 95%) nitrogen.

Other vendors are selling caps in a variety of other colors for purely decorative purposes. The decorative category even includes caps that light up when the wheels move.

Presta vs. Schrader As is true for a Presta valve, pressure inside a Schrader valve will hold the valve shut, but because the Schrader valve has a spring, it closes and stays closed even without pressure. Another difference is that the size of Schrader valve used for bicycle tires has a greater diameter than the Presta valve. The spring makes the Schrader valve better than the Presta valve for low pressure tires, but the larger diameter hole it requires can weaken the wheel rim. For this reason, Schrader valves are more common on mountain bikes--which have wider tires with lower pressure--than on other types of bicycles, particularly racing bicycles (which have narrow rims and tires and higher pressure).

A rim drilled for Presta valves may be converted to accept Schrader valves, by drilling it out with a 21/64" drill bit but care must be taken to carefully de-burr the resulting hole to prevent damage to the tire and inner tube.

The Schrader Valve's Dimensions The standard Schrader valve has the following thread:

External Thread

• METRIC: 7.7 mm OD, thread root diameter is 6.9 mm x 0.794 mm pitch.
• IMPERIAL: 0.305 in OD, thread root diameter 0.302 in x 32 tpi (threads per inch)

Internal Thread (the valve core)

• METRIC: 5.30 mm OD x 0.706 mm pitch
• IMPERIAL: 0.209 in OD x 36 tpi.

External links

• Schrader-Bridgeport website

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