From racing fans Fellnasen recommended ...

Although My six Mongolian gerbils run not excessive, but very, very much in their Bogie Wheels.
And many pluses let rejoice the Körnergeberin:

+ The Wheel Bogie is large enough (At least that !! with 29cm diameter. The other sizes are too small even for small animals), so that back injuries are avoided.
+ Material: Wood, must therefore be nibbled without inhibitions.
+ It is smooth, may well set in motion by the right light but also animals can be stopped easily.
+ It's whisper quiet, you can hear only the Tribbeln the feet, no squeaking or chattering (a gigantic advantage over other runners).
+ It is stable, no scissors effect etc.

- Advantage and disadvantage at the same time, the material: Unfortunately, my fur noses tend to do their business in the impeller, the whole penetrates the wood and can also be scrubbing with almost completely eliminate back, resulting in extreme odor nuisance. As a countermeasure, it has been proven, best from the outset the tread with toy paint (DIN EN 71-3) to sprinkle, so can the bike pretty well clean.

To me, no other runner more into the house.

The video shows Bini and crumble at the very first test ...