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You can find the route above.
I wouldn´t reccomend less than 50mm unless you are strictly doing asphalted roads, but one of the beauties of this country are the Caucasus mountains and the 'gravel' passes there, so you´ll want bigger tyres to enjoy the route with a minimum confort.
Having said that, if you can´t squeeze more than 42mm, go ride with it!
Two weeks tour through Georgia this past August:
https://www.flickr.com/photos/vacarneroveja/albums/72157672112307117