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@RuffStuff
My old plug was 67 GI I believe, that's probably about right, maybe 17t cog.
I've just had the arthritis cut off my knees, bones reshaped & microfractures so Spinny's definitely better for my knees hahaha.
I'm going to use a chainring off the tripple but the cogs SS specific, hopefully needing minimal tensioning as I don't want bar-face/balls interface when it slips