Only two yoyos I have (that I can think of) shipped with optional rubber weight o-rings. It’s an interesting idea.
The two I know are the Tom Kuhn SB-2 and the ThrowCafe Cappucino (pictured, this one is mine)
Of course the yo-yo has to have just the right dimple or curve in the cup to hold the o-ring in place via pressure fit. ThrowCafe even sells rings of varying weight:
- Black (3.0g)
- Red (3.3g)
- White (3.7g)
- PTFE (5.3g)
The Tom Kuhn website lists their black weight rings as compatible with the SB2, SB4, Tom Cat, and Black Cat and weighing in at 4g. My SB2 came with a pair in the bag, along with the friction stickers, string, and manual.
3.0g doesn’t sound like much, but as a percentage of the overall weight, let’s assume it is a typical ~65g, that’s about 5%. And the PTFE rings are getting into 10%. It’s also rim weight so the effect of that 5-10% should be noticeable in theory?
When I’ve experimented with this, I don’t feel the weight rings too much on the Cappucino so I’m not sure what to think about them. But I definitely didn’t like the weight rings on the SB2 personally which is only 55g, but then again responsive yoyos tend to be lighter and I think rightfully so!
Anyway I was just curious, I suppose a well designed yoyo should be just the “right” weight as shipped, and shouldn’t require weight rings… but you could technically experiment with rubber O rings on almost any yoyo that has enough cup support to hold them in, if for some reason you wanted to give it a bit more rim weight. Not sure if it’ll add “vibe” or not, I didn’t detect a ton of vibe on the Cappucino or SB2 with the rings installed, but maybe that’s because they are held tightly in place and are just the right size.
I guess you could say rubber o rings are the poor man’s bimetal yoyo