Joined: Aug 2010
Posts: 12,717
Likes: 2,104
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
I always want my best tire on the front. When the rear wears out, the front goes to the back and the new one goes on the front.
If you are going on a tour that is long enough to completely wear out a rear tire, buy a new one when you need one. Or if you carried a spare, put the spare on and keep your old worn out one as a spare.