Green Cap on Tires: What Does It Mean When You See Them?

Green cap on tires might get car owners confused because, aside from the cap keeping dirt and debris out of the valve stem, it also signifies something. There are different tire cap colors, but the green one is important to know because it affects how you pump your tires.

What Does A Green Cap on Tire Means

There are different benefits of using green cap tires, especially since your tires would last longer and you won’t need to check the pressure often, but what does it really mean? Continue reading our guide below to learn more about what the green cap means.

What Does It Mean to Have a Green Cap on Tires?

To have a green cap on tires means that the tire is filled with nitrogen gas rather than regular air. Any tire that has the green cap has been nitrogen-filled, and this is becoming the standard for many tire manufacturers and carmakers because of the benefits of nitrogen.

Nitrogen is an inert gas, so it is less likely to leak out of the tire, unlike with standard air. It is also cooler than air and would extend the lifespan of your car tires. Since nitrogen filled tires retain their pressure for a long time, you won’t have to check the pressure often.


Nitrogen-filled tires have been promoted by car professionals, dealers, repair centers and gas stations as the better option than plain air. The plastic cap also plays an important role rather than signifying that the tire is filled with nitrogen.

The plastic cap on the valve stem is meant to prevent debris and dirt from entering the tire, as this could cause a leak. Aside from the green cap, other colors include red, yellow and blue. Blue means your tire is filled with oxygen, while red and yellow signify low and high tire pressure, respectively.

What Are the Benefits of Tires With Green Caps?

The benefits of tires with green caps are that it maintains tire pressure for a longer time, reduces oxidation, runs cooler, improves fuel efficiency, lasts longer and also handles temperature changes better. You can enjoy using your green cap tire for a very long time.

Benefits of A Tire With Green Caps

Maintains Tire Pressure

Tires filled with nitrogen tend to maintain their pressure for a longer time than tires that are filled with regular air. Nitrogen does not contract or expand like compressed air because it is an inert gas, so it maintains its pressure in the tire. You won’t have to check your pressure often.

Mechanic While Checking The Tire Pressure

Lower Oxidation

Green tire caps also reduce oxidation when you’re driving, which reduces the chances of suffering from wear and tear. Nitrogen gas does not react with rubber as much as regular air, so it won’t negatively affect your tires.

Runs Cooler

Unlike plein air, nitrogen air runs cooler when it is filled in your tire. Nitrogen gas has a lower thermal conductivity than normal air, so it would be cool when it’s in your tire. This allows your tire to stay cool, even when there is a lot of friction or it is under stress.

Handles Temperature Changes Well

Nitrogen-filled tires don’t reduce or increase air pressure when the temperature changes, unlike normal tires. So regardless of the weather, you can enjoy using your tire.

Better Fuel Economy

Since nitrogen-filled tires keep their pressure for longer and the pressure is always balanced, they help you save gas and improve your fuel economy.

An Image Of Different Fuel Pumps

Long Lasting

In general, nitrogen tires last for a longer time. Unlike oxygen, they don’t adversely affect the rubber and metal parts of your tire.

Dozens Of Tires Dumping Somewhere

What Are the Disadvantages of Tires With Green Caps?

The disadvantages of tires with green caps are the cost and availability. While there are a lot of benefits to these tires, they are hard to find, and it would be expensive to fill your tires with nitrogen. But the pros do outweigh the cons in this case.

It Is Costly

The main drawback of using nitrogen in tires is the cost. It would be really expensive to fill all your tires with nitrogen gas. Luckily, the tire would last for a longer time, so you won’t have to spend

Not Widely Available

Another downside of using tires with green stem caps is the availability. Not all service stations come with nitrogen to fill your tires, so you would have to look around for a place that does. On the bright side, once you find a place, you can visit it whenever you need your tire filled.

Why Is the Valve Cap Important?

The valve cap is important because it protects the valve stem from ice, grease or road dust and comes with different colors to show you the type of tire you have. If your valve cap is not well installed or you don’t have it, it will damage your tire.

If your valve stem caps are not working, the stem can get clogged by debris like ice, dust or grease. It would make it hard for you to inflate your tire when the pressure goes down. Also, if there are no tire caps, the nitrogen will gradually leak out, and you will have a flat tire before you know it.

A Green Valve Cap on Vehicle Tire

You can easily remove the tire cap, but it’s important to put it back as soon as possible. To remove it, you should turn the wheel so that the cap is upside down. Then, use pliers with a snub nose to hold the bottom of the stem, and use a different plier to twist the cap until it has been removed.

Most people forget to put the valve cap on the tire after filling the tire with nitrogen, but you would have to spend money on another one. You can simply install it back from where it was removed and ensure it is tight.

What Is the Difference Between Green Cap Tires and Other Tires?

The difference between green cap tires and other tires is that the green cap is filled with nitrogen gas, and other tires are filled with regular gas, which mixes oxygen, nitrogen and other gasses. They also have differences in their tread life, fuel efficiency, rolling resistance, and cost.

Tread Life

The tread life measures how long a tire lasts before you have to replace it. Green valve stem tires have a longer tread life than the other tires, which means that it lasts longer. The nitrogen gas inside the tire keeps it inflated for longer and maintains pressure, so it won’t wear down quickly.

Threads Of A Used Tire


Although the cost of nitrogen tires differs based on the model and brand, and even the service station you visit, they are generally more expensive than other tires. But if you can afford it, it’s best to go with this tire and enjoy all the benefits.

Gas Mileage

Unlike other types of tires, green valve cap tires offer better fuel economy. It keeps your tire pressure maintained and helps you save gas.

Rolling Resistance

The rolling resistance of a tire contributes to its lifespan and the fuel economy of a car. Luckily, green cap tires have a lower rolling resistance, which means the car won’t spend a lot of energy to keep the tire rolling.

How Much Will You Spend on Pumping Nitrogen in Tires?

You will spend between $10 and $15 per tire on pumping nitrogen in tires. The cost of filling your tire with nitrogen would be different based on the service station you visit, but it should cost up to $15. That means you would spend up to $60 on four tires.

If you’re buying new tires from some service stores, they might also fill them with nitrogen at a lower price, so this would save you money. But filling your existing tires with nitrogen would cost more. If you want to switch to nitrogen, the service station would have to empty your tire, which would cost a lot more than getting a nitrogen refill.

Mechanic While Pumping Nitrogen On Tire

There is a lot of time and labor involved in removing the compressed air from your tire. Once it is completely empty, it will then be filled with pure nitrogen. You would spend between $50 and $100 or even more per tire to get this done. If you’re thinking of nitrogen tire inflation at home because of the lack of availability, it would be really expensive to buy the special equipment.

How Can You Check the Pressure of Green Cap Tires?

You can check the pressure of green cap tires the same way you check the pressure for normal tires, with a tire pressure gauge. There isn’t any difference in checking the tire, so you can use the standard tire gauge. It’s important to check the user manual before checking.

Technician Check The Pressure of Tire

You need to check the car’s manual to check the correct pounds per square inch (PSI) for your tire. Then, you can measure the pressure. Keep in mind that it’s important to check the pressure of your tires regularly so that they last longer.

If you want to check the pressure of your green cap tire, you should wait for the tires to cool down if you were just driving. This would give you a more accurate PSI. Also, keep in mind that the PSI for green cap tires is the same as tires with normal air. You don’t have to learn a new reading for your tires with nitrogen.

Frequently Asked Questions

Can You Put Normal Air in a Green Cap Tire?

Yes, you can put normal air in a green cap tire. There is nothing wrong if you mix nitrogen with regular air in your tire, as it won’t harm your tire. As long as it meets the correct tire pressure, you can add air to the tire.

Does Over-Tightening the Valve Caps Make the Tire Lose Pressure?

No, over-tightening the valve caps does not make the tire lose pressure, but it might crack and get damaged. If it’s plastic, there is a higher chance of it getting cracked. But if the cap is metal, it would be really hard to remove the cap later on.

Does Costco Provide Green Cap Tires?

Yes, Costco provides green cap tires. You can fill your tire with nitrogen at Costco or buy a green cap tire. It is also not as expensive as other service stations. All Costco stations use nitrogen and not compressed air to inflate tires.

Do Crosswind Tires Have Green Caps?

Crosswind tires manufacturer information is crucial for customers seeking green caps. Wondering if crosswind tires have green caps? No need to worry, as the crosswind tires manufacturer information holds the answer. Stay informed by researching the manufacturer details before purchasing crosswind tires.


With our detailed guide on green cap on tires, you know what it means when you leave a service station with a plastic valve cap of this color. Here’s a summary of our guide:

  • Green cap on tires means that the tire was filled with nitrogen and not standard air.
  • Tires with green caps come with better tire pressure, high gas mileage, lower oxidation, and maintain the pressure regardless of the temperature.
  • Filling your tire with nitrogen is more expensive, and not all service stations provide this.

If you’re interested in the benefits of getting nitrogen in your tires rather than compressed air, you can visit a service station that offers this service.


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