I don't use tire's or tubes at all any more...too much rotational weight. I
have also found that a bare rim on pavement has quite low rolling
resistance, though traction may suffer. Best of all - no more wasting money
on tires and tubes. The only expense is replacing the rim when you wear down
to the spoke nipples, but you'll easily get several thousand miles out of
'em before this happens.

Hope this settles things. Cheers!