# BEARINGS..

**URL:** <https://forums.yoyoexpert.com/t/bearings/32137>\
**Category:** Yo-Yo Mods and Maintenance\
**Created:** [November 29, 2011, 4:23am UTC](https://forums.yoyoexpert.com/t/bearings/32137 "2011-11-29T04:23:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![anonyo](https://avatars.discourse-cdn.com/v4/letter/a/8baadc/32.png) [@anonyo](https://forums.yoyoexpert.com/u/anonyo)\
**Post date:** [November 29, 2011, 4:23am UTC](https://forums.yoyoexpert.com/t/bearings/32137/1 "2011-11-29T04:23:42Z")

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for the last year I have heard about concave, abec, spec, 10 ball, center trac, terrapin, etc. but what is the difference in abec and spec? or 10-ball /spec…what is the difference in each bearing?

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**Author:** ![mingfu](https://avatars.discourse-cdn.com/v4/letter/m/f0a364/32.png) [@mingfu](https://forums.yoyoexpert.com/u/mingfu)\
**Post date:** [November 29, 2011, 4:37am UTC](https://forums.yoyoexpert.com/t/bearings/32137/2 "2011-11-29T04:37:40Z")

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Mainly how they play but usually stock bearings are already pretty good. All the bearings just play differently such as the konkave it’s supposed to keep the string centered though i heard that i could be a bit snaggy also a bit loud, 10 ball is really smooth and very quiet… Its all opinion though i tried a 10 ball for my speeder 2 didnt like it. the other 3 bearings i havent tried (abec,spec,terrapin) I heard though the terrapin is nice. my personal fav is the center trac or the speed 🙂

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**Author:** ![jhb8426](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/jhb8426/32/631_2.png) [@jhb8426](https://forums.yoyoexpert.com/u/jhb8426)\
**Post date:** [November 29, 2011, 6:41am UTC](https://forums.yoyoexpert.com/t/bearings/32137/3 "2011-11-29T06:41:03Z")

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ABEC ratings are generally meaningless in the yoyo world. They apply primarily to tolerances and have little, if any bearing on quality.

[http://skateboard.about.com/od/gear/f/ABEC\_Bearings.htm](http://skateboard.about.com/od/gear/f/ABEC_Bearings.htm)

> **[ABEC scale](https://en.wikipedia.org/wiki/ABEC_scale)**
>
> The ABEC scale is an industry accepted standard for the tolerances of a ball bearing. The ABEC scale is designed to provide bearing manufacturers dimensional specifications that meet the standards of precision bearings in a specified class. The scale is also used by manufacturers who produce equipment that require bearings must also know the dimensional tolerances to design parts that will accommodate a bearing.
> It was developed by the Annular Bearing Engineering Committee (ABEC) of the American...

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**Author:** ![Domin123](https://avatars.discourse-cdn.com/v4/letter/d/57b2e6/32.png) [@Domin123](https://forums.yoyoexpert.com/u/Domin123)\
**Post date:** [November 29, 2011, 7:03am UTC](https://forums.yoyoexpert.com/t/bearings/32137/4 "2011-11-29T07:03:41Z")

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To find out more, you can read the description on the YYE store. Some of them are self-explanatory. For example, Konkave bearings are concave in shape, allowing the strings to be centered during play, decreasing responsiveness.