I've purchased a 55 (red ball) before and I recall it being much larger. Am i to understand it should measure 55" around the middle of the ball?
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.
1548196
I do not believe the size is on the ball but I would say it's a small ball. The smallest of the three choices when buying an exercise ball.
1090123
No. It is bigger. I gave it as a gift, but I would say diameter is 7 inches. Nice small ball.
1439158
The ball is about 2 and 1/4 inches in diameter. It bounces higher than any ball you have seen. As others stated by others, it was used for most all the games we played as a kid.
426502
Get the 45 cm ball is under 5' tall; 55 cm for 5'-5'6"; 65 cm for 5'6"-6'; 75 cm for 6'-6'5" and 85 cm ball if over 6'5" tall. I am 5'10" and got the 65 cm ball which is just right for me!
1745969
I dont know where you got this information, but who ever provided it is crazy. The round ball is about 2 1/4 inches diameter. It is always fully inflated and bounces very high.
1477419
Justin, I have not measured. I have enough air in the ball to hold me up, so I can exercise. I had to fill twice. OK mine is also the same as yours. If you measure to the center of the ball it's 30". Does this help???
1212945
Its a bit bigger than a tennis ball... More like a baseball. I'll take a picture of mine next to a tennis ball and see if I can post it.
1765622
I have a 75cm and it looks like any size should fit the curve of it. It didn't have a box or instructions with it ( you just sit the ball on it ), so I wouldn't be afraid to try it.
80200
It comes with a small ball that is good quality. My son uses tons of other ones, too. I don't think it's quite big enough for a standard ball, but very close.
1641563
I'm 5' 2 1/2" and I bought the small ball, the 55cm. According to the box it is for up to a 5' 5" person.
499452
I have never tried a ball that large, but the chair does accomodate a larger ball. The back rest is arched outward and a larger ball would fit better in the ring at the bottom. The ball it comes with tends to slowly sink down to the floor. My ball stands about 20" if measuring from ground to the top. There is about 6 more inches when the ball is on the chair from the ball to the bottom of the chair back. So if your ball is taller than 26" it probably wont fit. If less, then it probably will. Worst case, if your 75 doesnt fit you still have the one it comes with.
1074421
These sizes are for the diameter of the balls (across) and not circumference (around). The page you use to select sizes also shows the equivalent in inches. I am 6'2" and the large (75cm) ball is about the height of a chair. My wife uses the medium size as she is 5'9". Good quality balls. I still use mine often after ~3 yrs.
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!
804710
Only the one that comes with it. Regilar large-size exercise balls do not fit. This is about half that size. The dimensions should be in the product description Or Sivan's website.
275899
The size of the ball doesn't matter. It is the size of the shaft on the ball. A 2" ball is just fine, just make sure the shaft is the correct size.
2026876
The ones I purchased are not small. I bought a pair in a local store to insure I got small ones. I found it to difficult to manipulate the 1/ 3/4 size boading balls.