# Defining size?

**URL:** https://forums.yoyoexpert.com/t/defining-size/16371
**Category:** General Yo-Yo
**Created:** [July 5, 2010, 10:15pm UTC](https://forums.yoyoexpert.com/t/defining-size/16371 "2010-07-05T22:15:58Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![XLazyThrowerX](https://avatars.discourse-cdn.com/v4/letter/x/b5e925/32.png) [@XLazyThrowerX](https://forums.yoyoexpert.com/u/XLazyThrowerX)
#### Post date: [July 5, 2010, 10:15pm UTC](https://forums.yoyoexpert.com/t/defining-size/16371/1 "2010-07-05T22:15:58Z")

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What defines a yoyo of being a certain size? I know that yoyos that have a diameter of 50mm or less are considered undersized, but what about full size and medium sized? Thanks. 😃

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### Author: ![SR1](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/sr1/32/104603_2.png) [@SR1](https://forums.yoyoexpert.com/u/SR1)
#### Post date: [July 5, 2010, 10:18pm UTC](https://forums.yoyoexpert.com/t/defining-size/16371/2 "2010-07-05T22:18:28Z")

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There isn’t really anything…

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### Author: ![Kristiawan](https://sea1.discourse-cdn.com/flex015/user_avatar/forums.yoyoexpert.com/kristiawan/32/366_2.png) [@Kristiawan](https://forums.yoyoexpert.com/u/Kristiawan)
#### Post date: [July 6, 2010, 12:28am UTC](https://forums.yoyoexpert.com/t/defining-size/16371/3 "2010-07-06T00:28:02Z")

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> [@SR1](#):
>
> There isn’t really anything…

yeah, i think theres no written standard about yoyo sizing.  
but most people, below 50 mm is mini yoyo, 50-51 mm are undersize, 52-54 mm are midsize, 55-57 are fullsize, 57 up is oversize.  
theres also micro size yoyo, but i’m not sure how to define it…