# Concave bearing

**URL:** <https://forums.yoyoexpert.com/t/concave-bearing/39339>\
**Category:** Looking for Help/Recommendation\
**Created:** [June 27, 2012, 1:31am UTC](https://forums.yoyoexpert.com/t/concave-bearing/39339 "2012-06-27T01:31:47Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![thanthedragelet](https://avatars.discourse-cdn.com/v4/letter/t/ce73a5/32.png) [@thanthedragelet](https://forums.yoyoexpert.com/u/thanthedragelet)\
**Post date:** [June 27, 2012, 1:31am UTC](https://forums.yoyoexpert.com/t/concave-bearing/39339/1 "2012-06-27T01:31:47Z")

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So i only have an axiom, sfx, and dm2, and was wondering if there are any concave bearings compatible with yyj. I tried looking but couldnt find anything.

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**Author:** ![sirnaq\_MN42](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/sirnaq_mn42/32/613_2.png) [@sirnaq\_MN42](https://forums.yoyoexpert.com/u/sirnaq_MN42)\
**Post date:** [June 27, 2012, 1:42am UTC](https://forums.yoyoexpert.com/t/concave-bearing/39339/2 "2012-06-27T01:42:07Z")

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Any C size bearing should fit including a KK.

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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:** [June 27, 2012, 1:48am UTC](https://forums.yoyoexpert.com/t/concave-bearing/39339/3 "2012-06-27T01:48:33Z")

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Check the specs to see what size bearing they take. In your case, those are all throws that use C-sized bearings. As a result, any C-sized bearing will fit. That includes Crucial Grooved, CenterTracs, KK’s, General Yo and plenty of others.

I think the bigger question will be does that bearing give you the performance you’re looking for. There’s only one way to find out.

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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:** [June 27, 2012, 4:17am UTC](https://forums.yoyoexpert.com/t/concave-bearing/39339/4 "2012-06-27T04:17:44Z")

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> **[Dif-E-Yo KonKave Bearing](https://shop.yoyoexpert.com/products/konkave-yoyo-bearing)**
>
> Setup your yo-yo right with the original centering bearing - Dif-e-Yo Konkaves! Dif-e-Yo Konkaves are not your average run-of-the-mill centering bearings, these are the original! Rather than just repurposing bearings for yo-yos,...

“The YYJ / YYF Size C (.250 x .500 x .187) bearing fits all “Large Bearing” YoYoJam”

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**Author:** ![vegabomb](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/vegabomb/32/199_2.png) [@vegabomb](https://forums.yoyoexpert.com/u/vegabomb)\
**Post date:** [June 27, 2012, 5:12am UTC](https://forums.yoyoexpert.com/t/concave-bearing/39339/5 "2012-06-27T05:12:28Z")

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There is a metric “C” size bearing as well. It’s used by ILYY and other yo-yo manufacturers. It’s very close to a standard C size bearing but a tiny bit smaller in diameter (at least as far as sitting on the bearing seat. It’s normally referenced as 6x13x5).