My browsing is by no means exhaustive, but it seems to me that bi-metals almost never have a cup for thumb grinding. Almost all seem to be flat. Is there a reason behind this?
Nobody really does thumb grinds
Sad. I like thumb grinds.
G2 Case File 003
Speak for yourself, I still like doing them.
Check out the 2Sick bimetals. I think most of them have IGRs. I have the Night’nGale, and it’s great for thumb grinds, and a great in general.
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Oh, yeah. YYF seems to like to have them. Check out their bimetals. The Edge, Superstar, Space Cowboy…
A lot of yoyos with just a wide inner lip, can be pretty good at them too.
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I just got that you were answering his question as to why they were hard to come by on bimetals. I think it also has to do with so many having the SS ring placed inside the rim.
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Off the top of my head - These two would work well:
And here’s a link for the bi-metal tag to help your search:
https://shop.yoyoexpert.com/collections/all/bimetal
We probably missed a few tags, but that’s the majority of bimetal yo-yos we have. 
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I love thumb grinds. YYO Hatchet+ is pretty good for them.
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Marco, breeze and navi work alright imo
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