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Don't have a clue. Can't recall ever having a fish on the reel while using the Ibis / BBS II combination.

It's certainly good enough to prevent tangles when you are stripping off line quickly. ...

I have the BBS II on my Winston Ibis 7'6" for 3 wt. It balances very nicely to that rod. I think a BBS I might be a bit light and small for my Ibis, but it might work out for the rod you have.
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