ball height/firmness? I want to purchase this ball for a computer chair. My current chair is 18 inches high, but I could probably go an inch or so higher. If this ball inflates to a full 75cm that would make it 29.5 inches high, right? Assuming it doesn't give too much when you sit on it (and I don't want it too be too soft/give--I want it to stay as round as possible while I'm sitting on it). But some of the reviews suggest that it doesn't actually inflate that high? Does anyone who has this ball have any suggestions? ball height/firmness? I want to purchase this ball for a computer chair. My current chair is 18 inches high, but I could probably go an inch or so higher. If this ball inflates to a full 75cm that... » Read More ball height/firmness? I want to purchase this ball for a computer chair. My current chair is 18 inches high, but I could probably go an inch or so higher. If this ball inflates to a full 75cm that would make it 29.5 inches high, right? Assuming it doesn't give too much when you sit on it (and I don't want it too be too soft/give--I want it to stay as round as possible while I'm sitting on it). But some of the reviews suggest that it doesn't actually inflate that high? Does anyone who has this ball have any suggestions? « Show Less
1769998
The description is not helpful. Is the inflated ball 75 cm diameter or 75 cm high?
1769999
"diameter: the length of a straight line passing through the center of a circle and connecting two points on the circumference"So 75cm diameter = 75cm height
1770000
I know this post is two months old, but I just received this exercise ball today. I'm also using it as a computer chair, and am replacing a previous ball that was a gift and my cat saw fit to use as a scratching post substitute. I have mixed initial impressions of this Max Fitness ball. It seems sturdy, but not tall enough for someone who's 6' 0". I'll try it out for a few days of course, but I'll be taking a look around Amazon to see if there's anything larger. Unfortunately I don't know the size or even brand of my previous ball so I can't compare, but it was noticeably bigger than this one. I know this post is two months old, but I just received this exercise ball today. I'm also using it as a computer chair, and am replacing a previous ball that was a gift and my cat saw fit to use as a scratching post substitute. I have mixed initial impressions of this Max Fitness ball. It seems sturdy, but not tall enough for someone who's 6' 0". I'll try it out for a few days of course, but I'll be taking a look around Amazon to see if there's anything larger. Unfortunately I don't know the size or even brand of my previous ball so I can't compare, but it was noticeably bigger than... » Read More I know this post is two months old, but I just received this exercise ball today. I'm also using it as a computer chair, and am replacing a previous ball that was a gift and my cat saw fit to use as a scratching post substitute. I have mixed initial impressions of this Max Fitness ball. It seems sturdy, but not tall enough for someone who's 6' 0". I'll try it out for a few days of course, but I'll be taking a look around Amazon to see if there's anything larger. Unfortunately I don't know the size or even brand of my previous ball so I can't compare, but it was noticeably bigger than this one. « Show Less
686188
I site on ball and my legs are flat on floor. I'm 6ft tall.I found the lifters made seat to high to use computer desk.
2140965
I am 5'10 so the 75" ball is great for me but I use it for my workouts. I agree with Linda, see if you can check it out before buying. If you belong to a gym, they should have some there but they may not be as firm as you need them due to repeated usage.
1315630
I am 5'2 and have the smaller ball; I can tell you it sits pretty low to the ground. The larger one may work with a very short desk, but the problem, I think, would be balancing on it for long periods. Why don't you just take it to work and use it to stretch during breaks? Hope this helps somewhat.
1011926
I weigh 120 and it popped on me, they are going to make a 5000 pound ball, they sent me one to replace mine. I don't know if they have them for sale yet, you might want to contact the company. Also I have a play ball that I have had for 20 plus years, you might like it better, made by Sport Fun, or at least that's the name of it. They used to make 3 sizes, I used it to bounce my daughter, and now my grandson to sleep several times a day, it has held up beautifully. I know it holds 300 lbs bouncing.. I can tell you the new black mountain ball is much sturdier than the old one, and far thicker material. Hope this helps. God bless I weigh 120 and it popped on me, they are going to make a 5000 pound ball, they sent me one to replace mine. I don't know if they have them for sale yet, you might want to contact the company. Also I have a play ball that I have had for 20 plus years, you might like it better, made by Sport Fun, or at least that's the name of it. They used to make 3 sizes, I used it to bounce my daughter, and now my grandson to sleep several times a day, it has held up beautifully. I know it holds 300 lbs bouncing.. I can tell you the new black mountain ball is much sturdier than the old one, and far... » Read More I weigh 120 and it popped on me, they are going to make a 5000 pound ball, they sent me one to replace mine. I don't know if they have them for sale yet, you might want to contact the company. Also I have a play ball that I have had for 20 plus years, you might like it better, made by Sport Fun, or at least that's the name of it. They used to make 3 sizes, I used it to bounce my daughter, and now my grandson to sleep several times a day, it has held up beautifully. I know it holds 300 lbs bouncing.. I can tell you the new black mountain ball is much sturdier than the old one, and far thicker material. Hope this helps. God bless « Show Less
1540935
I bought this thinking I could use it as a stand up desk for my laptop (since all the experts tell us we're sitting too much). However, when you extend it to it's maximum height, not only is it not quite high enough to use as a standing desk (and I am short!), but it also gets pretty wobbly. Right now, I have mine set at about 3 ft. and that is perfiect for sitting on the side of my bed and using my laptop. ( We have a somewhat tall bed, FYI.) I esitmate one could raise it another 8 inches or so since there are 2 more holes left on the metal post, but as I said, it gets pretty wobbly when fully extended. I do like it very much, though. Hope this helps. I bought this thinking I could use it as a stand up desk for my laptop (since all the experts tell us we're sitting too much). However, when you extend it to it's maximum height, not only is it not quite high enough to use as a standing desk (and I am short!), but it also gets pretty wobbly. Right now, I have mine set at about 3 ft. and that is perfiect for sitting on the side of my bed and using my laptop. ( We have a somewhat tall bed, FYI.) I esitmate one could raise it another 8 inches or so since there are 2 more holes left on the metal post, but as I said, it gets pretty wobbly when... » Read More I bought this thinking I could use it as a stand up desk for my laptop (since all the experts tell us we're sitting too much). However, when you extend it to it's maximum height, not only is it not quite high enough to use as a standing desk (and I am short!), but it also gets pretty wobbly. Right now, I have mine set at about 3 ft. and that is perfiect for sitting on the side of my bed and using my laptop. ( We have a somewhat tall bed, FYI.) I esitmate one could raise it another 8 inches or so since there are 2 more holes left on the metal post, but as I said, it gets pretty wobbly when fully extended. I do like it very much, though. Hope this helps. « Show Less
2236565
The inflated size of the ball on my chair is about 19". It could be inflated a bit larger than that-- maybe another 4" or so.
438100
Hi Liddia.. Sorry that I cannot be much help, and took so long to let you know. I ordered foam balls from three different suppliers, exactly because I didn't know the sizes. Wondered, as you have. Would be nice if the descriptions included sizes. I don't know which balls came from which source. I can only report that all of them were about 1-1/2 inch to 3 inches. Hope this helps some?? Ralph
2248280
I weight 220 and could still put more air into the ball to make it firmer if I weighed more. so i'd say give it a try. the frame is very sturdy with the 5 rolling casters. I don't lean on the backrest, so don't put any weight there, only use it to "scoot" in to my desk after sitting on the ball. i LOVE the chair and don't think about my low back at all anymore - it doesn't hurt and my abs and torso have gotten worked out each work day! i was gone for a week and my co-workers fought over time using my ball chair. a few of them are ordering one for themselves.
1409391
I am using this cushion on my office chair. I sit all day and I'm "plus size". I don't know exactly how long I've had it (at least 6 weeks) and it has maintained a good level of firmness. It has added height (slight lift). If you want guaranteed lift in height for a long drive, I would definitely say yes, it will hold up for a long drive. I am sorry, but can't give you a good guess on how much height you'll gain. You'll be pleased with the firmness holding up, but not sure it will give you the height in inches you are seeking since that depends on how low your car seat currently rests. I am using this cushion on my office chair. I sit all day and I'm "plus size". I don't know exactly how long I've had it (at least 6 weeks) and it has maintained a good level of firmness. It has added height (slight lift). If you want guaranteed lift in height for a long drive, I would definitely say yes, it will hold up for a long drive. I am sorry, but can't give you a good guess on how much height you'll gain. You'll be pleased with the firmness holding up, but not sure it will give you the height in inches you are seeking since that depends on how low your car seat currently... » Read More I am using this cushion on my office chair. I sit all day and I'm "plus size". I don't know exactly how long I've had it (at least 6 weeks) and it has maintained a good level of firmness. It has added height (slight lift). If you want guaranteed lift in height for a long drive, I would definitely say yes, it will hold up for a long drive. I am sorry, but can't give you a good guess on how much height you'll gain. You'll be pleased with the firmness holding up, but not sure it will give you the height in inches you are seeking since that depends on how low your car seat currently rests. « Show Less
808647
Mine at full height is 34.5" when the seat cushion is compressed with body weight. I always keep it at that height at a 41" counter and over a couple years has never sagged down one bit. It's a great chair and I love the foot rest.
1641852
God love you. Same thing happened to me. I bought the 11" memory foam. Only one person mentioned that the mattress was very firm and that was unfortunately after I purchased it. Damn thing kept getting harder, and I kept buying more foam toppers for comfort. Fortunately, my mom needed a new mattress and she has to have very firm. I gave her the hard 11" and ordered an 8" pressure relief memory foam and I love it. Feels so good to sleep on my side and not wake up hurting! So forget trying to "fix" that hard mattress and just get another one. You will quickly forget about the money you threw away! God love you. Same thing happened to me. I bought the 11" memory foam. Only one person mentioned that the mattress was very firm and that was unfortunately after I purchased it. Damn thing kept getting harder, and I kept buying more foam toppers for comfort. Fortunately, my mom needed a new mattress and she has to have very firm. I gave her the hard 11" and ordered an 8" pressure relief memory foam and I love it. Feels so good to sleep on my side and not wake up hurting! So forget trying to "fix" that hard mattress and just get another one. You will quickly forget... » Read More God love you. Same thing happened to me. I bought the 11" memory foam. Only one person mentioned that the mattress was very firm and that was unfortunately after I purchased it. Damn thing kept getting harder, and I kept buying more foam toppers for comfort. Fortunately, my mom needed a new mattress and she has to have very firm. I gave her the hard 11" and ordered an 8" pressure relief memory foam and I love it. Feels so good to sleep on my side and not wake up hurting! So forget trying to "fix" that hard mattress and just get another one. You will quickly forget about the money you threw away! « Show Less
1315631
I am 5'2" and the 55 cm ball is perfect as an exercise ball, but if I sat on it at work I think I would be too low to use a normal height desk. I would recommend having the ball stored under the desk and a chair and alternate between them. Also, at 5'2" if I did want to sit on a ball at work I might go for a bigger size. I don't remember if there is anything in between 55 and 65 but I think I could do 65 for sitting only.
1335931
I am 5'6" and using it. It is the same height as my chair seat. Some variance may come from how much air you put in the ball, but the higher you go the harder the seat. I spend some time in a regular chair, and some of my time in this chair on any normal day.
1894345
We purchased two and we were surprised that they were compressed into a rather slender box, but once we unwrapped them and let them re-inflate, they were exactly as they had been described on the site. We have used ours many times and they actually are quite comfortable. If after 24 hours they are not 4" in all areas, I would suggest that you contact the company and request a replacement.
485765
It depends on what you will be using it for? I have a 65cm ball with this base and it is NOT a tight fit, although it does work for exercise and also helps to stabilize the ball for sitting on. I have two bases, one for the 65cm ball which I will be using at home for exercise and one for a larger size ball to sit on at work. I do think a 45cm ball is going to be ok but do not know for sure because that is not what I use? Either way I like the base, loose or not... :)
992863
The diameter should be 55 centimeters, from one side to the other side going through the center. I think some companies may make the same size in different colors. My understanding is that the size should be on your ball, either near the brand name or around the end where it is to be inflated. I would check for a size, perhaps you were sent a wrong size.