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. 
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…
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