Would this would be good for a 2nd grader with child size desks at school?

Yes. It is the right size for my (small, but long legged) 9 y.o. (Fourth grader)

I have four of these and one ball has a leak where can I get replacement balls?

They offer replacement balls on Amazon: https://www.amazon.com/gp/product/B073XZPZYC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Can the castor wheels be replaced with the roller blade style wheels that come on some desk chairs now? Is their attachment point the standard size?

I’m not sure what the standard size is but hopefully this helps

Would a 3 year old be able to sit on this chair comfortably?

My son is 47" and it's perfect for him...he's kindergarten. However, you need a very low desk. We have it paired with a lifetime adjustable plastic table on the lowest leg height. It's the rectangle portable table from Costco. I would say it is going to be too small for him in a couple years.

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Gaiam Kids Balance Ball Chair, Blue/Green, Metal

Gaiam Kids Balance Ball Chair, Blue/Green, Metal

Product ID: 33043777

Details

Brand
Gaiam
Color
Blue/Green
Item Weight
7.59 Pounds
Material
Metal
Product Dimensions
16.6"L x x

🦽Lockable caster wheels for mobility

⚖️38cm kid-sized balance ball

🛠️Includes pump & assembly tools

Details

Brand
Gaiam
Color
Blue/Green
Item Weight
7.59 Pounds

Description

🎯 Sit Smart, Learn Sharp: The Balance Ball Chair That Keeps Kids Ahead of the Curve

ACTIVE FOCUS BOOSTER - Transforms restless energy into laser-sharp concentration for kids aged 5-7.
COMPLETE READY TO USE KIT - Comes with inflation pump, metal holder, and easy-glide wheels—assembly in under 5 minutes.
ERGONOMIC POSTURE SUPPORT - Promotes healthy spine alignment with adjustable back support and dynamic sitting.
FLEXIBLE CLASSROOM ESSENTIAL - Ideal for active learning environments, reducing fidgeting and boredom with movement-friendly seating.
PERFECT FIT FOR GROWING KIDS - Designed specifically for children 42-51 inches tall, supporting up to 175 lbs comfortably.

The Gaiam Kids Balance Ball Chair is a kid-sized ergonomic seating solution designed to enhance focus and posture for children aged 5-7. Featuring a 38cm stability ball, adjustable back support, secure metal frame, and lockable caster wheels, it encourages active sitting to reduce restlessness and improve concentration. Perfect for home or classroom use, this chair supports up to 175 pounds and comes with an easy-to-use air pump and assembly tools, making it a practical and health-conscious alternative to traditional desk chairs.

Specifications

ASIN	B01DY5J792
Age Range Description	Kid
Best Sellers Rank	#6,320 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #38 in Exercise Balls
Brand	Gaiam
Brand Name	Gaiam
Color	Blue/Green
Customer Reviews	4.2 out of 5 stars 500 Reviews
Global Trade Identification Number	00018713622419
Included Components	Gaiam Kids Balance Ball Chair
Item Dimensions L x W x H	16.6"L x 18.5"W x 23.2"H
Item Weight	7.6 Pounds
Manufacturer	Fit For Life
Material	Metal
Maximum Weight Recommendation	175 Pounds
Model Number	05-62241
Part Number	05-62241
Product Dimensions	16.6"L x 18.5"W x 23.2"H
Size	Onesize
UPC	018713622419
Unit Count	1.0 Count

Reviews

D**E

26.05.2025

M**A

3.08.2024

J**S

8.04.2017

T**0

18.03.2022

A**A

30.01.2026

T**S

14.01.2025

M**3

4.05.2022

B**H

30.08.2021

A**A

27.03.2025

R**D

17.04.2025

M**A

30.04.2025

V**C

24.07.2022

E**K

18.04.2023

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