Exercise wheel: plastic and metal aren't equal, a study finds
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
A closed plastic wheel or an open wire-mesh wheel: the choice can look trivial, but a study measured real differences in health and motivation between the two. Our equipment picks are gathered in the rodent accessories section.
A more motivating wheel, with a measurable effect on the body
Walker and Mason published a study in 2018 in Physiology & Behavior comparing a closed "fast-trac" plastic wheel with an upright wire-mesh metal wheel in mice (see the study). Neither wheel caused any detectable health or welfare problem. However, only mice with access to the plastic wheel developed significantly larger hearts and hind legs than wheel-less control animals, a sign of sustained physical effort. The mice were also willing to push through a heavier weighted door — working harder — to reach the plastic wheel than to reach the metal one.
What this means when choosing a wheel
A wire-mesh wheel is not directly dangerous to use, but it does not drive the same level of physical activity as a solid, enclosed running surface. For an active hamster, rat or mouse, a wheel with a solid floor encourages a steadier, fuller running gait than a barred wheel, where a foot can slip or get caught. Diameter matters too: our guide to the silent exercise wheel covers recommended sizes by species, while the closed exercise ball is best avoided for other reasons covered in our article on the risks of the exercise ball.
- Larger hearts and hind legs in mice with access to the closed plastic wheel, not the metal one.
- Greater effort exerted by mice to reach the plastic wheel.
- No health or welfare problem detected with either model in this study.
Between two wheels of the same diameter, one with a solid, enclosed running surface remains the safer pick for encouraging steady physical activity, even though the wire wheel wasn't found to be harmful.
Frequently asked questions
Is a barred metal wheel dangerous?
The study found no health problem linked to its use, but the risk of a trapped foot is higher than with a solid surface, especially in young animals.
Does this study also apply to hamsters and rats?
It only covers laboratory mice; a solid running surface is still the recommended principle for all rodent species that use a wheel.
Should a working metal wheel be replaced right away?
Not urgently, but when it's time to replace it, a solid, enclosed wheel is the more favourable choice according to this study.
In our shop, for this use: Ceramic hideout for hamsters and small rodents (11.5 × 9 × 8.5 cm) (€24.90) · the whole shop
This guide is part of Planète Pets’s Rodents universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.