I was there - just want to know what you have
I tried what brucepick suggested
the guy at the junk yard thought I was casing his aluminum rims
like I was going to sneak back later and steal them
said he did not have any
he had no idea of why a guy would come to a salvage yard with a scale
I left
here is another alternative if the salvage trip does not work out
weigh your tire and rim
look up the spec weight of the tire and subtract that
guess weight lost to wear (if they are old) and add that back in
I bet you are within a pound of the rim weight
and my aluminum rims varied by almost that much
if you are not changing rims either way
- perhaps that is close enough for your curiosity