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 | Kids-Sized Stability Ball | Metal Frame Base | Core Engagement | Alternative Desk Seating | Home & School

Gaiam Kids Balance Ball Chair, Blue/Green, Metal | Kids-Sized Stability Ball | Metal Frame Base | Core Engagement | Alternative Desk Seating | Home & School

Product ID: 33043777

Details

Brand
Gaiam
Color
Blue/Green
Item Weight
7.59 Pounds
Size
Onesize
Style
Kids

🛞lockable caster wheels

⚖️38cm kid-sized balance ball

🛠️sturdy metal frame base

$336.09

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Description

🎯 Sit Smart, Focus Hard: The Ultimate Active Learning Throne for Kids!

FLEXIBLE MOBILITY - Smooth-rolling, lockable caster wheels for easy movement and stability when needed.
ACTIVE FOCUS BOOSTER - Transforms restless energy into laser-sharp concentration for kids aged 5-7.
COMPLETE KIT INCLUDED - Comes with inflation pump, adjustable back support, and secure metal holder for hassle-free setup.
CLASSROOM HOME READY - Designed to fit preschool to 2nd grade kids, perfect for dynamic learning environments.
ERGONOMIC CORE ENGAGEMENT - Promotes healthy posture and strengthens core muscles with every bounce.

The Gaiam Kids Balance Ball Chair is a kid-sized ergonomic seating solution featuring a 38cm stability ball supported by a durable metal frame and lockable caster wheels. Designed for children aged 5-7 (42-51 inches tall) and up to 175 pounds, it encourages active sitting to improve posture, core strength, and concentration. Ideal for home or classroom use, it includes an air pump, adjustable back support, and secure ball holder for easy assembly and long-lasting use.

Specifications

ASIN	B01DY5J792
Additional Features	Arm Rest, Ergonomic, Rolling
Assembly Instructions Description	Includes: Child-sized 38cm balance ball, easy-inflation air pump, ... INFLATION INSTRUCTIONS: For a perfect fit, it may be necessary to re-inflate the ball once or twice after the initial inflation to stretch to its final size. Inflate ball with air, let stand for 24 hours, deflate 50% then fill again to 38cm height.
Best Sellers Rank	#4,906 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #27 in Exercise Balls
Brand Name	Gaiam
Color	Blue/Green
Customer Reviews	4.2 4.2 out of 5 stars (499)
Global Trade Identification Number	00018713622419
Included Components	Gaiam Kids Balance Ball Chair
Item Depth	21 inches
Item Dimensions	34 x 18 x 21 inches
Item Weight	7.59 Pounds
Manufacturer	Fit For Life
Manufacturer Part Number	05-62241
Material Type	Metal
Model Number	05-62241
Product Care Instructions	Wipe with Dry Cloth
Required Assembly	Yes
Size	Onesize
Style Name	Kids
UPC	018713622419
Unit Count	1.0 Count

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$336.09

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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