Yes we all know I love undersized yoyos… so I’m want to stick around that. They’re the most fun and easy to throw. Anywhere around 53 diam or less. I doubt there are undersized bimetals with SE’s, but if so I’d be very eager.
Right now I want to find something that looks nice and is undersized. I plan to try finding some nice spiral SE’s. I will want something fun to throw them with, thanks!!
I’ve been a big side effects fan for a while now. The only bi metal yoyo that uses side effects I’m aware of is the Atmos Projects - Khuno which is definitely not undersized and reasonably difficult to find.
Side effects are incredible and are such a unique and satisfying feature to tinker with.
OD 54 is the smallest SE yoyo as far as I know
i would recommend the parlay, or a sudo, both are on the bst right how. of you like organics, and i believe they fit your size goal.
Rebirth and Reboot are 53mm. 54 gen 2 is 54mm.
54 had a notable diameter, but because it was the largest (so far).
Also, Kamuraiju at 54mm
Look up the Dietz on OD.
The Noma by Atmos is a sweet undersized SE throw! 52.6 mm and <60 g! It’s light, floaty, and organic.
Unfortunately, I think it’s sold out.
reboot and rebirth are fun. rebirth has some cool colors out there
I think the noma might be smaller!
second this one, Rebirth is amazing.
Yelets is a 52.6147 diameter
also, Zero gravity Janus is also pretty cool, if you want a something more micro at 45mm. It’s light and narrow so more oriented for modern responsive.
My recommendation, if you can find one is the luftverk daytona SE it’s 52.81mm diameter; my personal go to yo-yo. I like it so much I am always just considering selling all my other yo-yos 
I too, was going to recommend OD Rebirth!
The Parlay is a really solid throw and One Drop still seem to be releasing them all these years later. So they’re accessible and also reasonably affordable.
Haven’t tried a Dietz, but the Lab Experiment & Halifax are pretty similar and I’ve used both. They definitely feel & play like minis. If that’s what you’re after then maybe try to track one down.
Cascades have a good reputation (never tried one myself), but they’re usually a bit expensive. Prescriptions have a somewhat similar design (never tried one either!) but are harder to find.
Sakura SE and Lab Experiment #1 are just… incredibly rare.
1to1s are seriously so insanely wide that it feels like cheating. Probably not what you would describe as undersized. It feels like .
I think I’m going to wait for a Market I like, or an Aitch in obviously the Market. Markets are very beautiful. I don’t really know all what’s out there though so XD
Rebirth would be my recommendation. Great player, relatively inexpensive, and it’s fun to think it’s inspired from the project and project 2. Kind of a project 3. It’s been the throw that pops back out and in to my rotation. I now own 2.
