# Speed bearings
**URL:** https://forums.yoyoexpert.com/t/speed-bearings/46569
**Category:** Yo-Yo Mods and Maintenance
**Created:** [December 14, 2012, 6:45am UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569 "2012-12-14T06:45:34Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@Domin123](https://forums.yoyoexpert.com/u/Domin123)
#### Post date: [December 14, 2012, 6:45am UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569/1 "2012-12-14T06:45:34Z")
I have not been actively maintaining my yoyo parts recently, and now, I found a few unlabelled bearings in my collection. I am not sure what bearings they are, so I would like to inquire, how do I recognize a YYJ Speed bearing? Does it have any distinguishing features?
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### Author:  [@wcrase](https://forums.yoyoexpert.com/u/wcrase)
#### Post date: [December 14, 2012, 8:08am UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569/2 "2012-12-14T08:08:43Z")
On the shield is stamped YYJ SPEED.
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### Author:  [@dynikus](https://forums.yoyoexpert.com/u/dynikus)
#### Post date: [December 14, 2012, 8:45am UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569/3 "2012-12-14T08:45:04Z")
does it matter? a bearing’s a bearing. I honestly don’t see a noticeable difference in play from a ceramic kk to a yye bearing, or a crucial groove to a terrapin x.
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### Author:  [@GregP](https://forums.yoyoexpert.com/u/GregP)
#### Post date: [December 14, 2012, 9:01am UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569/4 "2012-12-14T09:01:56Z")
> [@dynikus](#):
>
> does it matter? a bearing’s a bearing. I honestly don’t see a noticeable difference in play from a ceramic kk to a yye bearing, or a crucial groove to a terrapin x.
I envy you, I really do. I notice a significant difference between most bearings.
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### Author:  [@Domin123](https://forums.yoyoexpert.com/u/Domin123)
#### Post date: [December 14, 2012, 10:29am UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569/5 "2012-12-14T10:29:42Z")
> [@dynikus](#):
>
> does it matter? a bearing’s a bearing. I honestly don’t see a noticeable difference in play from a ceramic kk to a yye bearing, or a crucial groove to a terrapin x.
While it might not matter sometimes, but it’s always a good to be able to identify and differentiate your bearings. It would help in describing your setup to others, or when selling them with your yoyos.
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### Author:  [@anonyo](https://forums.yoyoexpert.com/u/anonyo)
#### Post date: [December 14, 2012, 5:32pm UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569/6 "2012-12-14T17:32:00Z")
> [@Cinimod105](#):
>
> > [@dynikus](#):
> >
> > does it matter? a bearing’s a bearing. I honestly don’t see a noticeable difference in play from a ceramic kk to a yye bearing, or a crucial groove to a terrapin x.
>
> While it might not matter sometimes, but it’s always a good to be able to identify and differentiate your bearings. It would help in describing your setup to others, or when selling them with your yoyos.
I catalog what I have in a yoyo in my database. I can’t remember a whole lot of stuff like this. Write it down!
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### Author:  [@Domin123](https://forums.yoyoexpert.com/u/Domin123)
#### Post date: [December 15, 2012, 9:39am UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569/7 "2012-12-15T09:39:56Z")
> [@Waylon](#):
>
> On the shield is stamped YYJ SPEED.
Is ‘S’ and ‘SPEED’ interchangeable? Mine states ‘S’.
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### Author:  [@daniel0731ex](https://forums.yoyoexpert.com/u/daniel0731ex)
#### Post date: [December 15, 2012, 6:27pm UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569/8 "2012-12-15T18:27:12Z")
The shields are narrower and the edge of the outer race is truncated/rounded quite a bit, so you can’t really utilize the full width of the bearing.
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### Author:  [@dynikus](https://forums.yoyoexpert.com/u/dynikus)
#### Post date: [December 16, 2012, 6:05am UTC](https://forums.yoyoexpert.com/t/speed-bearings/46569/9 "2012-12-16T06:05:44Z")
> [@Cinimod105](#):
>
> > [@dynikus](#):
> >
> > does it matter? a bearing’s a bearing. I honestly don’t see a noticeable difference in play from a ceramic kk to a yye bearing, or a crucial groove to a terrapin x.
>
> While it might not matter sometimes, but it’s always a good to be able to identify and differentiate your bearings. It would help in describing your setup to others, or when selling them with your yoyos.
It probably would be a good idea, but I’m not worried about it. I think I traded away a yoyo with my ceramic kk in it a while ago, never missed it.