If the thread and width of the tires are approx. the same, no reason why it shouldn't work. I have...various times in cycling life.
What I was warned just this weekend because I wanted to buy a slightly different (and tougher) tire for my front wheel, I was told by the bike mechanic, that never to install a back tire that is skinnier/narrower than the front.
I suspect it has to do with weight-bearing issues, particularily if your bike regularily carries substantial back pannier/back rack weight. (and my bike does work hard in this area since we don't have a car)



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