there french ,,, realy good at retreating ,,,but shit at going forward ,,,,,, i hear the germans supplied the french army with them in ww2 on all there vehicles
heres a reply i got from arnaud a while ago ,asking about the pair i have
there was a "diabolo" model with sealed bearings and then there were unsealed ones aswell.
some had a specai freewheel system "helicomatic "
forgot to mention i had a set of zd's with them on i got on a survivor