Are The habitrail ovo suite tubes to big for dwarf hamsters.?

No when it comes to small pets bigger is always better but the only thing I would be careful of is the cage bar spacing. As long as the package sais suitable for dwarf hamster on it you should be good.

Nothing is too big as long as the hamster can fit through. I say yes because I have seen videos of dwarf hamsters going through the habitrail ovo things. I don`t recomend using the actual thing as a cage, unless you can get like three or four of them, but you can use it as a carrier or a play zone.