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I don't think I went quite that skinny (Vredestein S-Licks on the road for commuting doesn't count) but they were less than 2" that's for sure. I do remember buying a 2.3" "downhill" tyre - maybe a Tioga DH? or something for the front of my rigid SS to make up for lack of suspension.
Punctured it during a team 24hr and swapped to my hardtail anyway so didn't really use it much.Tioga Factory DH 2.3"
I bet there's road bikes out now that would fit that DH tyre :)
I remember racing on 1.5" specialized hardpacks, and some really skinny Ritchey Z-max, the brick red ones. :)