Ray, I ran the Ultradynamico Rosé on my Hillborne (one batch ago) which measure 49-50mm in reality, and there was at least 5mm per side thru the fork and lots of clearance at the back. I would feel comfortable running any tires labeled 48c, but I don't think I'd try a 2.1". Besides, anything bigger than 48c doesn't make sense to me - you're starting to change the geometry (namely BB height) and push the bike outside the zone its meant for, and neither of these things are going to make the bike ride better.
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