You are probably safe at 104 psi but here's what I would do:
Inflate your tires up to 87 psi and ride it. If you find that you are getting frequent "snake bite" flats with 2 parallel slits, ease the air pressure up. If you don't (my bet) leave well enough alone.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.