# Dimensions of bearing?
**URL:** https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587
**Category:** General Yo-Yo
**Created:** [April 22, 2013, 3:32am UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587 "2013-04-22T03:32:01Z")
**Posts on this page:** 13
**Page:** 1
### Author:  [@MYNAMEISZen](https://forums.yoyoexpert.com/u/MYNAMEISZen)
#### Post date: [April 22, 2013, 3:32am UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/1 "2013-04-22T03:32:01Z")
I was wondering what the dimensions of a C and D size bearing are in mm because I’m fiddling around with designing a yoyo and need to know how much to factor it In for the width and to design the bearing seat
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### Author:  [@daniel0731ex](https://forums.yoyoexpert.com/u/daniel0731ex)
#### Post date: [April 22, 2013, 3:33am UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/2 "2013-04-22T03:33:09Z")
> **[Ball Bearings](https://yoyo.fandom.com/wiki/Ball_Bearings)**
>
> 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:  [@MYNAMEISZen](https://forums.yoyoexpert.com/u/MYNAMEISZen)
#### Post date: [April 22, 2013, 3:57am UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/3 "2013-04-22T03:57:56Z")
> [@daniel0731ex](#):
>
> [Ball Bearings | YoYo Wiki | Fandom](http://www.yoyowiki.org/wiki/Ball_Bearings)
thanks now to decide on D or C… Probably D
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### Author:  [@Bcmaddog](https://forums.yoyoexpert.com/u/Bcmaddog)
#### Post date: [April 22, 2013, 12:24pm UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/4 "2013-04-22T12:24:37Z")
> [@MYNAMEISZen](#):
>
> > [@daniel0731ex](#):
> >
> > [Ball Bearings | YoYo Wiki | Fandom](http://www.yoyowiki.org/wiki/Ball_Bearings)
>
> thanks now to decide on D or C… Probably D
D is basically a A.
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### Author:  [@Jdrabik](https://forums.yoyoexpert.com/u/Jdrabik)
#### Post date: [April 22, 2013, 12:34pm UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/5 "2013-04-22T12:34:48Z")
> [@Bcmaddog](#):
>
> > [@MYNAMEISZen](#):
> >
> > > [@daniel0731ex](#):
> > >
> > > [Ball Bearings | YoYo Wiki | Fandom](http://www.yoyowiki.org/wiki/Ball_Bearings)
> >
> > thanks now to decide on D or C… Probably D
>
> D is basically a A.
Not really, a D is wider. Some are wider than C bearings.
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### Author:  [@yuki\_onitsura](https://forums.yoyoexpert.com/u/yuki_onitsura)
#### Post date: [April 22, 2013, 12:52pm UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/6 "2013-04-22T12:52:19Z")
Errrr… no, a D is noticeably larger than an A bearing.
Yuki
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### Author:  [@kendamaguy101](https://forums.yoyoexpert.com/u/kendamaguy101)
#### Post date: [April 22, 2013, 2:30pm UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/7 "2013-04-22T14:30:03Z")
trololol
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### Author:  [@MYNAMEISZen](https://forums.yoyoexpert.com/u/MYNAMEISZen)
#### Post date: [April 22, 2013, 4:57pm UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/8 "2013-04-22T16:57:05Z")
Size D is 5x11x4 and A is 5x10x4 noticeably different.
Here’s my noob design specs 🙂
Diameter: 56.5 mm
Width: 46 mm
Weight: 64.8 g
Size D bearing
I hate designing yoyos that will never be produced … Oh well 🙂
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### Author:  [@Jdrabik](https://forums.yoyoexpert.com/u/Jdrabik)
#### Post date: [April 22, 2013, 9:10pm UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/9 "2013-04-22T21:10:33Z")
> [@MYNAMEISZen](#):
>
> Size D is 5x11x4 and A is 5x10x4 noticeably different.
> Here’s my noob design specs 🙂
> Diameter: 56.5 mm
> Width: 46 mm
> Weight: 64.8 g
> Size D bearing
> I hate designing yoyos that will never be produced … Oh well 🙂
That looks like an interesting yoyo. If it ever does get produced, please tell us. I’d like to see it.
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### Author:  [@PlasticWhip](https://forums.yoyoexpert.com/u/PlasticWhip)
#### Post date: [April 22, 2013, 9:42pm UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/10 "2013-04-22T21:42:45Z")
> [@MYNAMEISZen](#):
>
> Size D is 5x11x4 and A is 5x10x4 noticeably different.
> Here’s my noob design specs 🙂
> Diameter: 56.5 mm
> Width: 46 mm
> Weight: 64.8 g
> Size D bearing
> I hate designing yoyos that will never be produced … Oh well 🙂
Wrong, D is 5x11x5
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### Author:  [@MYNAMEISZen](https://forums.yoyoexpert.com/u/MYNAMEISZen)
#### Post date: [April 22, 2013, 10:17pm UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/11 "2013-04-22T22:17:51Z")
> [@Jdrabik](#):
>
> > [@MYNAMEISZen](#):
> >
> > Size D is 5x11x4 and A is 5x10x4 noticeably different.
> > Here’s my noob design specs 🙂
> > Diameter: 56.5 mm
> > Width: 46 mm
> > Weight: 64.8 g
> > Size D bearing
> > I hate designing yoyos that will never be produced … Oh well 🙂
>
> That looks like an interesting yoyo. If it ever does get produced, please tell us. I’d like to see it.
haha ok I’m trying to talk to my dad right now about it so we’ll see. Still debating the C and D bearing
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### Author:  [@yuki\_onitsura](https://forums.yoyoexpert.com/u/yuki_onitsura)
#### Post date: [April 23, 2013, 12:08am UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/12 "2013-04-23T00:08:40Z")
I think for a first up effort, a C bearing might be best because it gives you more options to figure out what type of bearing works best. I’d love to see some prototypes of this. The specs look very interesting.
Yuki
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### Author:  [@MYNAMEISZen](https://forums.yoyoexpert.com/u/MYNAMEISZen)
#### Post date: [April 23, 2013, 12:47am UTC](https://forums.yoyoexpert.com/t/dimensions-of-bearing/52587/13 "2013-04-23T00:47:27Z")
> [@yuki\_onitsura](#):
>
> I think for a first up effort, a C bearing might be best because it gives you more options to figure out what type of bearing works best. I’d love to see some prototypes of this. The specs look very interesting.
>
> Yuki
pm me your email or # and I can send you pics it still needs a bearing seat and axle though