My favourite tyre on my commuting bent is the Marathon Plus. It's slow heavy and virtually bombproof (Just like the rest of the bike). I don't even bother to carry a pump.
On my RANS I had Primo Comets in the 1.5x20 size and will get them again. I like the wider tyre for the shock absorption on our horrible chip sealed roads. I got about 4000km out of the rear and over 5000km out of the front before they got too worn and cut and were puncturing all the time.
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Get a bicycle. You will not regret it if you live. ~Mark Twain, "Taming the Bicycle"
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