# Centertrac, flat, ceramic, gold: what's up with those bearings?

**URL:** <https://forums.yoyoexpert.com/t/centertrac-flat-ceramic-gold-whats-up-with-those-bearings/293197>\
**Category:** Yo-Yo Mods and Maintenance\
**Created:** [September 19, 2018, 6:01pm UTC](https://forums.yoyoexpert.com/t/centertrac-flat-ceramic-gold-whats-up-with-those-bearings/293197 "2018-09-19T18:01:13Z")\
**Posts on this page:** 1\
**Showing post:** 13

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**Author:** ![codinghorror](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/codinghorror/32/8052_2.png) [@codinghorror](https://forums.yoyoexpert.com/u/codinghorror)\
**Post date:** [October 4, 2018, 9:56pm UTC](https://forums.yoyoexpert.com/t/centertrac-flat-ceramic-gold-whats-up-with-those-bearings/293197/13 "2018-10-04T21:56:49Z")

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Right but [what _kind_ of concave?](https://forums.yoyoexpert.com/t/history-of-differences-between-different-concave-bearings/290973) There are many!

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