It’s an interesting take from One Drop, considering that was 2010, by which point 56mm was very much an industry standard, looking at brands like Yoyofactory, Yoyojam or Yoyorecreation. Even in 2010 I considered the 54 a mid-sized yo-yo, since it’s the same diameter as the peak.
But anyway, I’ve derailed this thread enough: I like the original 888, the Bear Vs Man and the SPYY Punchline
I’m sure many would not be surprised if I said my favorite small throw and my favorite in general is the David Yo-yos Dreamland. It’s just an incredible joy to throw. 50mm and powerful as !&$@ but incredibly agile with great presence. I also have an MK1 Lossless (hoping to make it 2) and it does indeed have many of the amazing quality of the Dreamland. Funny thing for me is after getting the DL I tried so many other undersized D bearing throws looking for anything close to it (the DL is pretty difficult to attain). I now have quite a few amazing undersized throws… they are my favorite. The Lossless was the only one I tried that even got close to the feel of the DL. The Lossless is a tad more agile and quick where the DL is a tad more luxury. These are both the absolute sweet spot for me. There are other smaller and quite reputable throws but below 49mm they become a lot more like work than joy to me so I’ve not tried many and can’t compare.
I won’t answer for now because my answer might be changing soonish. 
UPDN Orange has entered the chat
On topic though, gotta be the Spinworthy Lemon for a boutique choice, and 888 for a more standard attainable choice.
The new 20th anniversary edition of the ILYY E1NS is supposed to drop on their website tomorrow. Bssed on past releases, I’m guessing the price (with shipping to USA) will be about $140.
I always thought 55mm was the threshold for a yoyo to be “standard” diameter
And I must rep FeatherSpin here. Ptarmigan D shreds and I’m getting a Corvus next week. I also have an Osprey and Ibis on my wishlist. I’ve tried all but the last and they all are stellar in their own way
In my mind (where it is at best 2014)
Undersized is 50mm - 52mm
Full sized is 56mm
Anything between is midsized, anything below is micro/pocket, and anything above is a gimmick. I realise this is no longer accurate 
I agree with you.
I respect all the yo-yos that have been mentioned so far, but maybe we should change the number then ~48mm to 53mm.
We can keep the 55mm as to add to the discussion but also slightly dropping the standard. Would you gentlemen respect those numbers?
I feel anything lower we would be getting into mini-micro numbers
I would include throws <54 mm. I think of full sized, as beginning at 54 mm
Noted! Lets see the turnout with updated parameters and hope to see a positive response. I left a wide open width as I’d like to see what people might think of a wide yet smaller diameter yoyo such as the Atmos lamina.
While following the theme of the thread I listed my favorite… but there are many from 54mm-50mm that I love but they can’t all be favorites. I will say the Atmos Fuji is right up at the top as well as Duncan Yoshicuda.
i have alot of favorites but for this thread lately its been the D bearing Ptarmigan.
The Chanman Empire Naan is my all time favourite, so obviously my favourite undersized 
Also the Project Cosmos Dome is another great undersized throw.
Luftverk- Daytona SE
RSO - SS bowl mini C or D
Jake Bullock Shrunk Dunk slaps at 49. The large width helps stability a ton while still being agile.
+1 for tuna-from-tin
Snack or Heist.
Could a Lacrima a be considered pocket sized, you know because it’s roughly 50mm both ways.
I just started looking at the slenderness of the Snack. Both very appealing
Some secret lore that folks might not know is that I did the CAD work for the Dreamland. The Lossless intentionally uses the same bearing, same sized response pads, and similar weight. It also is intentionally a tiny bit wider, a tiny bit smaller in diameter, and uses a harder H shape instead of the softer roundy-round profile.
Thank you doc!
