# One Drop Flat Bearings Are Outdated: Change My Mind **URL:** \ **Category:** Yo-Yo Mods and Maintenance\ **Created:** [May 17, 2019, 3:57pm UTC](https://forums.yoyoexpert.com/t/one-drop-flat-bearings-are-outdated-change-my-mind/302430 "2019-05-17T15:57:04Z")\ **Posts on this page:** 1\ **Showing post:** 31
**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**Post date:** [May 18, 2019, 1:39am UTC](https://forums.yoyoexpert.com/t/one-drop-flat-bearings-are-outdated-change-my-mind/302430/31 "2019-05-18T01:39:33Z")
Overview of shapes > [@History of / differences between different concave bearings?](https://forums.yoyoexpert.com/t/history-of-differences-between-different-concave-bearings/290973): > > [image] OK so there are a variety of concave bearing shapes: obviously, pure smooth concave, the “O” of bearing shapes if you will concave but with a center channel indent for the string angled down to the middle, the “V” of bearing shapes if you will the most common type: flat in the center, but the sides angle up, the “H” of bearing shapes if you will. I’d say 80% of the “concave” bearings I encounter are this type the least common type, a combination of V and H, angled steps i… - Flat is… flat. Simple. 🙂 - CT is flat in the middle, angled up slightly on each end. I would kiiiinda put DS and “pixel” in this category as well (four “steps” meaning the middle is relatively flat and the sides are angled up more). - Pure concave, V, and string groove are all strong centering and conceptually really do _force_ the string into the center at all times. --- _[View the full topic](https://forums.yoyoexpert.com/t/one-drop-flat-bearings-are-outdated-change-my-mind/302430)._