# "A" Size bearing question
**URL:** https://forums.yoyoexpert.com/t/a-size-bearing-question/381148
**Category:** General Yo-Yo
**Created:** [July 26, 2023, 12:48am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148 "2023-07-26T00:48:59Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@Hojo-YoYo](https://forums.yoyoexpert.com/u/Hojo-YoYo)
#### Post date: [July 26, 2023, 12:48am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/1 "2023-07-26T00:48:59Z")
What yoyos use an A size bearings? I need two for some hubstacks and was wondering if I had something I could borrow them from.
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### Author:  [@SML](https://forums.yoyoexpert.com/u/SML)
#### Post date: [July 26, 2023, 12:52am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/2 "2023-07-26T00:52:13Z")
Most small bearing Duncans use A.
Are you sure you don’t need B bearings? They’re almost the same size as As but have a larger inner diameter. Some small bearing YYJ use those.
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### Author:  [@bheinz63](https://forums.yoyoexpert.com/u/bheinz63)
#### Post date: [July 26, 2023, 12:55am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/3 "2023-07-26T00:55:06Z")
Hub stacks typically use A bearings
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### Author:  [@Big](https://forums.yoyoexpert.com/u/Big)
#### Post date: [July 26, 2023, 12:56am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/4 "2023-07-26T00:56:15Z")
He needs a size. All hub stacks that i can think of use a bearings. Most older model duncans and the newer freehand ones use a bearings. For hubstacks you will also need caps and o-rings to hold the bearings in place
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### Author:  [@SML](https://forums.yoyoexpert.com/u/SML)
#### Post date: [July 26, 2023, 1:00am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/5 "2023-07-26T01:00:07Z")
I think most of my hubstacked yoyos are Magic Yoyo, which use B. I guess they’re the outliers.
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### Author:  [@Exmime](https://forums.yoyoexpert.com/u/Exmime)
#### Post date: [July 26, 2023, 1:09am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/6 "2023-07-26T01:09:59Z")
Get 2 FH1ps
> **[Freehand One - Plastic FH1](https://shop.yoyoexpert.com/products/freehand-one-yoyo-by-duncan-toys)**
>
> In 2001 the original Duncan Freehand was launched and with it came a change in the world of yoyos. Duncan had tapped into something unique. Although the why was not fully understood, everybody recognized it: the Freehand was special. In addition to...
And 2 upgrade kits and use the flats in your stacks
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### Author:  [@Hojo-YoYo](https://forums.yoyoexpert.com/u/Hojo-YoYo)
#### Post date: [July 26, 2023, 2:23am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/7 "2023-07-26T02:23:08Z")
Big, I have the rings and caps just need bearing and everyone seems to be out of stock
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### Author:  [@Hojo-YoYo](https://forums.yoyoexpert.com/u/Hojo-YoYo)
#### Post date: [July 26, 2023, 3:04am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/8 "2023-07-26T03:04:02Z")
Thank you all for your input, I just ordered a 10 pack from the rain forest at less than a 1.00 each.
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### Author:  [@rizki\_yoist](https://forums.yoyoexpert.com/u/rizki_yoist)
#### Post date: [July 26, 2023, 6:25am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/9 "2023-07-26T06:25:49Z")
Size A bearing measures 5 x 10 x 4mm, and part number MR105. You can get a generic one from most bearing stores, just use the measurement or part number to search. I got non C sizes flat bearings this way, they costs almost nothing.
> **[Ball Bearings](https://yoyo.fandom.com/wiki/Ball_Bearings#Sizes)**
>
> Ball bearings, in the context of yo-yo play, were introduced in the early 1990s. They are used to reduce friction while the yo-yo is sleeping. A ball bearing yo-yo can be played in two extreme states. One configuration involves using a thick...
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### Author:  [@Big](https://forums.yoyoexpert.com/u/Big)
#### Post date: [July 26, 2023, 7:00am UTC](https://forums.yoyoexpert.com/t/a-size-bearing-question/381148/10 "2023-07-26T07:00:54Z")
Yoyoexpert has 38 yoyofactory A bearings in stock. Sorry i do t know how to link it. Edit: I figured it out.
> **[YoYoFactory Bearings](https://shop.yoyoexpert.com/collections/yo-yo-bearings/products/yyf-yoyo-bearing?variant=42515858129086)**
>
> These are replacement bearings for your YoYoFactory yo-yos.The Small Spec Bearing is a high quality Size A (5x10x4 mm) stainless steel bearing yo-yo for small bearing compatible yo-yos.The Large Spec Bearing is a Size C (.250 x .500 x .187) and fits...