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 (ガイアム) 子供用バランスボールチェア - クラシックな子供用安定性ボールチェア、オルタナティブスクールクラスルームの柔軟なデスクシートアクティブな学生向け満足保証付きブルー/グリーン

Gaiam (ガイアム) 子供用バランスボールチェア - クラシックな子供用安定性ボールチェア、オルタナティブスクールクラスルームの柔軟なデスクシートアクティブな学生向け満足保証付きブルー/グリーン

Product ID: 738042252

Details

ブランド
Gaiam
商品の寸法
42.2長さ x 47幅 x
商品の重量
7.59 ポンド
材質
金属
色
グリーン

🎯38cm kid-size ball

⚖️175 lbs max load

🛠️Adjustable back support

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C$37167

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered 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
GTIN (Global Trade Identification Number)	00018713622419
UPC	018713622419
おすすめ度	4.2 5つ星のうち4.2 (477) var
お客様の年齢層	キッズ
カラー	グリーン
サイズ	Onesize
ブランド名	Gaiam
メーカー名	Gaiam
メーカー型番	05-62241
ユニット数	1.0 個
同梱商品	Gaiam キッズバランスボールチェア
品番・型番	05-62241
品目寸法（L x W x H）	42.2長さ x 47幅 x 58.9高さ cm
商品の重量	7.59 ポンド
最大推奨重量	175 ポンド
素材	金属

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C$37167

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered 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 Nicaragua.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Gaiam (ガイアム) 子供用バランスボールチェア - クラシックな子供用安定性ボールチェア、オルタナティブスクールクラスルームの柔軟なデスクシート アクティブな学生向け満足保証付き ブルー/グリーン

Details

Details

Description

Specifications

Common Questions

Gaiam (ガイアム) 子供用バランスボールチェア - クラシックな子供用安定性ボールチェア、オルタナティブスクールクラスルームの柔軟なデスクシートアクティブな学生向け満足保証付きブルー/グリーン