# Why not d-bearings for normal-sized yos?

**URL:** <https://forums.yoyoexpert.com/t/why-not-d-bearings-for-normal-sized-yos/381658>\
**Category:** General Yo-Yo\
**Created:** [August 1, 2023, 3:33pm UTC](https://forums.yoyoexpert.com/t/why-not-d-bearings-for-normal-sized-yos/381658 "2023-08-01T15:33:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Benthrowsyoyo](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/benthrowsyoyo/32/300522_2.png) [@Benthrowsyoyo](https://forums.yoyoexpert.com/u/Benthrowsyoyo)\
**Post date:** [August 1, 2023, 3:33pm UTC](https://forums.yoyoexpert.com/t/why-not-d-bearings-for-normal-sized-yos/381658/1 "2023-08-01T15:33:42Z")

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While I know that there are a couple full-size yoyos with d-bearings out there I am curious as to why C is still the reigning choice for most yos while d is reserved for undersized. From a physics standpoint wouldn’t a d bearing allow for longer spintime due to a smaller axis of rotation?

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**Author:** ![Jeaves](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/jeaves/32/203410_2.png) [@Jeaves](https://forums.yoyoexpert.com/u/Jeaves)\
**Post date:** [August 1, 2023, 3:37pm UTC](https://forums.yoyoexpert.com/t/why-not-d-bearings-for-normal-sized-yos/381658/2 "2023-08-01T15:37:39Z")

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possibly,

but limiting factor is more likely friction, strength of throw, and string length

swapping to a smaller bearing (and pads) can up the efficiency, but not provide extra energy to be converted into rotation

i would guess smaller bearings are harder to make as well

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**Author:** ![Captrogers](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/captrogers/32/647012_2.png) [@Captrogers](https://forums.yoyoexpert.com/u/Captrogers)\
**Post date:** [August 1, 2023, 3:49pm UTC](https://forums.yoyoexpert.com/t/why-not-d-bearings-for-normal-sized-yos/381658/3 "2023-08-01T15:49:43Z")

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Some of it I would assume cones with availability and standardization. C bearings work are relatively cheap and used nearly everywhere and in multiple hobbies like skates, skateboards and RC. It makes the hobby more accessible to a wider audience. Not saying that’s perfect either because those hobbies have there own outliers and sizing too however it’s like the 19mm pad situation. Most yoyos have a common set of maintenance items that are interchangeable.