We bought this bike because it has a large diameter and the hamster so his back does not sag. Our hamster has accepted the wheel immediately and we were happy! The next morning, after he got the bike, everything was full of blood spatter! Our little has very extreme accrued paws, so that even on the platforms in the enclosure bloody small Pfötchenabdrücke could be seen!
Good size and beautiful appearance, but dangerous for the little rodents! Then maybe buy from Trixie the 28cm plastic impeller!