I always mean to write the ideal pressure on the sidewall, near the valve, because I have so many bikes with so many different tire sizes that I usually can't remember what I liked the tire pressure at.
But then I always forget to do that, too, so...
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1964 JRJ (Bob Jackson), 1973 Wes Mason, 1974 Raleigh Gran Sport, 1986 Schwinn High Sierra, 2000ish Colian (Colin Laing), 2011 Dick Chafe, 2013 Velo Orange Pass Hunter