Recently bougth this, and now discovered rear wheels were very heavy (hardly possible) to turn by hand when jacked up.
Undoing the wheelbearing solved this, and the first bearing was looking undamaged so my thougth is that they were only misadjusted recently .
There are two normal conical rollerbearings in and I expect they need to be only ligthly thigthened so that you cannot feel any play when the wheel is mounted, but that they should keep spinning for at least half a turn (considering the drivetrain).
Can someone confirm this?