  I discuss measurements of disk mass from non-circular streaming motions of
gas in the barred galaxies NGC 3095 and NGC 4123. In these galaxies with strong
shocks and non-circular motions, the inner regions must be disk-dominated to
reproduce the shocks. This requires dark matter halos of low central density
and low concentration, compared to LCDM halo predictions. In addition, the
baryonic collapse to a disk should have compressed the halo and increased the
dark matter density, which sharpens the disagreement. One possible resolution
is a substantial amount of angular momentum transfer from disk to halo, but
this is not particularly attractive nor elegant.
