  We made a detailed analysis of the sample of 39 cluster spiral galaxies of
various types observed at H$\alpha$ wavelength by Amram et al. (1992 to 1996),
with a scanning Fabry-Perot. We plotted the outer gradient of their rotation
curves as a function of the deprojected cluster-centric distance. The rotation
curves of late type galaxies markedly rise far from the cluster center. This
suggests evolutionary effects, since early types show no special trend. We
suggest that the evolution process within a cluster leads late type galaxies to
exhibit flatter curves when they get closer to the center, on their way to
evolving into early type galaxies.
