A new member of our group asked when signing up if the Sun EZ-3 USX
can handle a 350 pound rider? A 300 pound friend had ridden ours. Can
anyone top that?

It occurs to me that a heavy rider might want to replace the standard
65 PSI tires with 100 PSI ones. If I recall correctly, the ideal on a
standard road bike is to have about one square inch of road contact
per tire. Given the 65 pound weight of the Sun EZ-3 USX itself plus a
350 pound rider, even at 100 PSI there would be more than one inch of
road contact on each of the three tires.

Any other advice for helping the bike accommodate a hefty rider?