I purchased a 75cm ball but could only inflate it to 63.5cm. Does the ball need to stretch a bit before it can reach the 75cm size?
269072
Yes. inflat to the max. wait a few days,use it, sit on it. In time it will stretch out. You feel the difference once it's stretched out.
1017754
This ball is 30" in diameter when fully inflated. You may inflate it to any diameter up to that size by simply putting in less air. That way it is adjustable to your liking. Thanks for asking!
975557
yes, yu have a choice a ball that yu fill with air or a foam filled ball.. i actually called the company and spoke with the owner (his name is justin) . you should be able to choose at the time of your purchase
2217193
Hello - the balls do need to be inflated up to 1.45 pounds per square inch [psi]. Thanks!
499454
The chair comes with it's own ball, and a circumference tape to check inflation. If the ball is sinking through it is underinflated. I had that problem in the beginning, and once properly inflated (by air compressor not the cheesy hand pump)it has been fine. I'm sure you could use a larger ball, I tried one but it was actually too tall once in the chair frame and I went back to the original. And yes you do lose the back support with a larger ball, but the whole point of the chair is to engage your lower body, so the backrest has always seemed more cosmetic than functional to me.
265282
It's a large exercise ball and fills the space in the chair. The instructions actually tell you to pump it as full as you can, and then the ball will stretch and you can add more air. I added air for about the first week until it was what I consider fully inflated. It hasn't needed more since then. Hope this helps.
830448
Yes-it's very easy. You should not inflate this ball fully. Mine is about 3/4s full. It's a personal preference.
1619588
Yes, it deflates and becomes small and light. It's good, but the ball is awful -- take along your own; any cheap, small rubber or plastic ball will do (about softball size: 12"-16" diameter would be fine).
1745968
Nope. Just means the ball has a diameter of 3 inches. If you squeeze it, it depresses perhaps another inch in.The rubber is a very thin material, not designed for longevity. The originals in the 1950's were very thick rubber.
312375
Inflating the ball with the included foot pump does not require a special valve. I wish it did. My only complaint about the ball is: during inflation, one looses half the air while disconnecting the foot pump.
508185
Just unroll it , open the valve and it will inflate, then close the valve. It only inflates an inch or 2.
202758
I have mine on the 2nd hole from the bottom and from the floor to the top of the backrest, it's about 30". There are a total of 4 holes for you to adjust the height as you need. As for the ball, mine fits fine. I think the very nature of the ball causes it to expand after you've sat on it for a while. I agree, it feels like it's deflating, but I think more often than not, it just feels like that because the ball is being stretched out. I have mine in my office at work and I sit on it for 8 hours a day so it gets a lot of stretching. I just keep the pump that came with it in my desk and I'll re-inflate it as needed. No big deal. I have mine on the 2nd hole from the bottom and from the floor to the top of the backrest, it's about 30". There are a total of 4 holes for you to adjust the height as you need. As for the ball, mine fits fine. I think the very nature of the ball causes it to expand after you've sat on it for a while. I agree, it feels like it's deflating, but I think more often than not, it just feels like that because the ball is being stretched out. I have mine in my office at work and I sit on it for 8 hours a day so it gets a lot of stretching. I just keep the pump that came with it in my desk and... » Read More I have mine on the 2nd hole from the bottom and from the floor to the top of the backrest, it's about 30". There are a total of 4 holes for you to adjust the height as you need. As for the ball, mine fits fine. I think the very nature of the ball causes it to expand after you've sat on it for a while. I agree, it feels like it's deflating, but I think more often than not, it just feels like that because the ball is being stretched out. I have mine in my office at work and I sit on it for 8 hours a day so it gets a lot of stretching. I just keep the pump that came with it in my desk and I'll re-inflate it as needed. No big deal. « Show Less
811806
Agreed. Make sure the ball is out of the locking space. If that doesn't work, it could be faulty. I received one that didn't latch properly and the seller promptly sent me a new one.
1115931
Since the question I have received sounds like the first part of the question is missing. I will respond this way. You will need to have a pump to inflate and maintain the inflation of your ball. The one you shared as being the one you used looks more than fine for the task.
79570
I am in the same boat. Mine came a bit inflated but not enough to use. Trying to inflate with pump (not provided) I don't feel much progress is happening.
1765625
I imagine it should fit, but honestly don't "know." It's pictured with a 55cm ball and I bought a 45cm that doesn't fit snugly into the base. that's why I think the larger ball may even be more stable in this base than smaller ones. Enjoy!
1136991
I got mine on ebay and also got a smaller ball. I'm hoping the answers are correct and it will stretch out. I know the ball I already had seems a lot thinner than this one. So maybe that's why.