If they're anything like the Power Cups I've been running all summer they might come up big. My 28s measure 31.5mm.
I've got the now defunct power tubeless ones in 32c which come up at 35c on my rims, I've got used to that plump width.
@Saffronspokes started
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If they're anything like the Power Cups I've been running all summer they might come up big. My 28s measure 31.5mm.