Originally Posted by dddd

I would feel confident that achieving an even 75kg on these wheels would be better than any steel-rim "showroom" bike from that era.

Familiar numbers like 120kg are for 32-hole double-walled rims, not single-walled and not "tubular" steel clincher rims.

The Schwinn-made rims are so heavy and sturdy that 40kg tension on a single-rider bike would suffice.