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 - Classic Kids Stability Ball Chair, Alternative School Classroom Flexible Desk Seat with Satisfaction Guarantee for Active Students, Blue/Green

Gaiam Kids Balance Ball Chair - Classic Kids Stability Ball Chair, Alternative School Classroom Flexible Desk Seat with Satisfaction Guarantee for Active Students, Blue/Green

Product ID: 738042252

Details

Brand
Gaiam
Color
green
Item Weight
3.44 kg
Material
metal
Product Dimensions
42.2L x 47W x

🎯38cm kid-size ball

⚖️175 lbs max load

🛠️Adjustable back support

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2838005Fr

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Sold byAmazon CongoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎈 Balance, focus, and fun — the ultimate kid’s seat upgrade!

ALL IN ONE KIT - Includes pump, adjustable backrest, and smooth-rolling wheels for effortless setup and mobility.
PERFECT FIT DESIGN - Custom inflation method ensures the ideal 38cm ball size tailored for growing kids.
ERGONOMIC STABILITY - Promotes healthy posture with a secure metal ball holder and lockable caster wheels.
ACTIVE FOCUS BOOSTER - Transforms restless energy into laser-sharp concentration for kids aged 5-7.
FLEXIBLE LEARNING SEAT - Ideal for home or alternative classrooms, supporting dynamic, active learning environments.

The Gaiam Kids Balance Ball Chair is a 38cm ergonomic seating solution designed for children aged 5-7 (42-51 inches tall) with a weight limit of 175 lbs. It features an adjustable back support, secure metal ball holder, and lockable caster wheels, promoting active sitting that enhances posture and concentration. Perfect for home or classroom use, it comes with an air pump and easy inflation instructions to ensure the perfect fit for active learners.

Specifications

ASIN	B01DY5J792
Age Range Description	Kid
Brand Name	Gaiam
Color	green
Customer Reviews	4.2 4.2 out of 5 stars (477)
Global Trade Identification Number	00018713622419
Included Components	Gaiam Kids Balance Ball Chair
Item Dimensions L x W x H	42.2L x 47W x 58.9H cm
Item Weight	3.44 kg
Manufacturer	Gaiam
Material	metal
Maximum Weight Recommendation	79.38 kg
Model Number	05-62241
Part Number	05-62241
Size	Onesize
UPC	018713622419
Unit Count	1.0 Count

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2838005Fr

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In stock

Sold byAmazon CongoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Congo.

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