
Basketballs can be expensive, so it's important to take good care of them. One way they can deteriorate is by becoming lopsided. A quick way to check if your basketball is lopsided is to throw it up in the air above your head and see if it spins in a perfect circle or has a wobble. If it wobbles, it's lopsided. This can be caused by overinflation, pumping it up too fast, or storing it in a cold place. Unfortunately, there is no at-home solution to fix a lopsided basketball, but you can try taking it to a leather shop for repair.
| Characteristics | Values |
|---|---|
| Spin test | If the basketball wobbles when spun, it is lopsided. |
| Bounce test | If the basketball bounces back to waist-height when dropped from shoulder height, it is not overinflated. |
| Storage | Storing the basketball in a cool place can cause the air to contract and the ball to deflate. |
| Inflation | Overinflation or fast inflation can cause bumps or lumps due to the air not spreading evenly. |
| Repair | There is no at-home solution to fix a lopsided basketball. Professionals may be able to repair it by reshaping the bladder. |
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What You'll Learn

Throw it in the air, if it wobbles, it's lopsided
If you want to check whether your basketball is lopsided, the quickest way to do so is to throw it in the air. Throw the ball up in the air about 15 feet above your head and observe its movement. If the basketball spins in a perfect circle, it is not lopsided. However, if it wobbles, even slightly, it is lopsided. The severity of the wobble will indicate how lopsided the ball is.
There are several reasons why a basketball may become lopsided. One common cause is overinflation or pumping the ball up too quickly, which can result in bumps or lumps on the ball's surface. Additionally, storing the ball in a cold place or in a trunk can cause the air to condense and the ball to deflate. When the temperature rises, the ball will return to its natural state and re-inflate.
It is worth noting that a lopsided basketball may still be playable, but it may not perform optimally. If you believe your basketball has become lopsided due to a manufacturing issue, you may be able to exchange it at the place of purchase, even without a receipt.
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Overinflation or fast pumping can cause lopsidedness
Basketballs can become lopsided due to overinflation or fast pumping. This is because the air inside the ball does not have enough time to spread uniformly throughout the ball and is forced to one centralized location, resulting in a bump or lump. This bump will continue to grow as the bladder inside the ball weakens with the air pressure being forced against it.
To prevent this from happening, it is important to store your basketball properly. Storing the ball in a cool space and then moving it to a hot space will cause the air particles to expand and contract, putting stress on the basketball's bladder. This can be avoided by keeping the ball at a consistent temperature.
Additionally, it is important to not overinflate the ball. Overinflation can cause the ball's bladder to not equally distribute the air, and it will take the path of least resistance, forming a bump. Balls stored in trunks or cold places will condense the air, which will cause the ball to deflate. Once it hits high temperatures, the ball will naturally re-inflate.
If your basketball does become lopsided due to overinflation or fast pumping, there are a few ways to get the bump removed. One option is to go to a leather shop and ask them to repair the ball. They will have to remove the top layer and completely repair the inside of the ball, either by melting or reshaping the bladder.
Another quick way to tell if your basketball is lopsided is to throw it up in the air above your head and observe its spin. If it spins in a perfect circle, it is not lopsided. However, if it wobbles, it is lopsided, and the severity of the wobble will determine how lopsided it is.
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Storing in cold places can cause deflation and lopsidedness
Storing basketballs in cold places can cause deflation and lopsidedness. This is due to the relationship between pressure, volume, and temperature outlined in the ideal gas law. For a closed system, the initial pressure divided by the initial volume is equal to the final pressure divided by the final volume. In the context of basketball, this means that a basketball exposed to lower temperatures will experience a loss in pressure, resulting in reduced bounce.
It's important to note that the NBA recommends inflating basketballs between 7.5 and 8.5 lb. of pressure. Using the ideal gas law, we can estimate that for every 10-degree temperature change, a ball's pressure will change by one pound. For example, a ball inflated to 8.5 lb. of pressure at 75°F will have a pressure of 7.37 lb. if the temperature drops to 65°F.
To avoid issues with lopsidedness and deflation, it is recommended not to store basketballs in cold places. Additionally, avoid inflating the ball more to compensate for cold temperatures, as this can cause damage when the ball is brought inside or exposed to warmer temperatures. Instead, ensure the ball is inflated correctly and store it at room temperature.
If you suspect your basketball may be lopsided, you can perform a simple test. Hold the ball out from your body at shoulder height and drop it. A properly inflated ball should bounce back up to your waist. If it doesn't, the ball may be overinflated or underinflated, causing lopsidedness. Unfortunately, there is no known fix for a lopsided basketball, as the inner lining is compromised. The best course of action is to exchange the ball, as most places will allow, even without a receipt, if it's a manufacturing issue.
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Bumps or lumps are a sign of a lopsided basketball
Bumps or lumps on a basketball are a clear indication that it is lopsided. This is usually caused by overinflation or by pumping the ball up too quickly. If a ball is stored in a cold place, such as the trunk of a car, this can also cause the air inside to condense and the ball to deflate, which can also result in bumps or lumps when the ball returns to a higher temperature.
There is a simple test to check whether a basketball is lopsided. Throw the ball up into the air to a height of around 15 feet. If the ball spins in a perfect circle, it is not lopsided. However, if there is any wobble, then the ball is lopsided. The severity of the wobble will indicate how lopsided the ball is.
Another test for a lopsided basketball is to hold the ball out at shoulder height and drop it. If it bounces back up to waist height, then it is not overinflated or underinflated.
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The inner lining may be compromised
A basketball is made of a hollow bladder composed of butyl rubber, which is wrapped in nylon thread and encased in a leather sleeve. The butyl rubber that makes up the inner bladder of the basketball is the same material that is used in the inner tube of a bicycle wheel. This material is a synthetic copolymer made of 98% isobutylene and 2% isoprene. It has properties that make it resistant to abrasion, tearing, and flexing, and it has a low gas permeability due to its high density and low molecular movement.
If a basketball is lopsided, it may be because the inner lining of butyl rubber has been compromised. This could be due to a manufacturing defect or damage caused by external factors such as being kicked or played on rough surfaces. When the inner lining is compromised, air can leak out, causing the ball to become lopsided or oblong.
It is challenging to fix a lopsided basketball, and there may be no effective way to repair it completely. Some people suggest experimenting with adding more weight to one side of the ball to counterbalance the lopsidedness. However, this may not be a reliable or long-lasting solution.
If you suspect that your basketball is lopsided due to an issue with the inner lining, it is recommended to take it back to the place of purchase. Most retailers will allow you to exchange the ball, even without a receipt, if it is determined to have a manufacturing defect.
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Frequently asked questions
Throw it up in the air about 15 feet above your head. If it spins in a perfect circle, it's not lopsided. If it wobbles, it's lopsided.
This is usually due to overinflation or pumping it up too fast. The air doesn't have time to spread throughout the ball, so it gets forced into one area, creating a bump.
Store your basketball properly to maintain its uniform shape. Avoid storing it in cool and hot spaces, as this will cause the air particles to expand and contract, putting stress on the basketball's bladder.
There is no at-home solution to fix a lopsided basketball. However, you can get the bump professionally removed. A leather shop may be able to help by melting or reshaping the bladder inside.
Yes, proper storage and care can help prevent lopsidedness. Avoid kicking the ball, as this can cause it to become lopsided.










































