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

€ 526.07

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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

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Description

🎯 Sit Smart, Learn Sharp — The Balance Chair Every Kid’s Classroom Needs!

KID CENTRIC DESIGN - Sized precisely for 42-51 inch children, supporting up to 175 lbs with style and durability.
ERGONOMIC STABILITY - Promotes healthy posture with a secure metal ball holder and adjustable backrest.
ACTIVE FOCUS BOOSTER - Transforms restless energy into laser-sharp concentration for kids aged 5-7.
MOBILITY MEETS SAFETY - Smooth-rolling caster wheels with dual locks for flexible yet secure classroom seating.
PERFECT FIT INFLATION - Optimized air pump and inflation method ensure ideal bounce and comfort every time.

The Gaiam Kids Balance Ball Chair is a 38cm ergonomic seating solution designed for children aged 5-7 (42-51 inches tall), supporting up to 175 lbs. Featuring an adjustable back support, secure metal ball holder, and lockable caster wheels, it encourages active sitting to improve focus and posture in home or classroom settings. Includes an air pump and detailed inflation instructions for optimal comfort and performance.

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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TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

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3 weeks ago

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€ 526.07

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Imran F.

Very reliable shop with genuine products. Will definitely buy again!

2 weeks ago

Ayesha M.

The product exactly matches the description. Very satisfied with my purchase.

5 days ago

View all Trustpilot reviews

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