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@diceface
I just dug out the chainrings from my XT sac
They're not Biopace, I'm a doughnut. They're plain SGs. They do have comically short teeth in 2 places but apparently those are for my shifting pleasure and are not just worn down.
I might still be interested in some more tho, I want them for touring so a spare middle ring wouldn't go amiss :)
As for the marathon Jack, nothing mentioned yet. I've never ridden the route pre-race, I'd be up for it...