What Size Exercise Wheel Does a Hamster Need?

The Straight-Back Test

Watch your hamster run. If its back curves upward like a banana, the wheel is too small, and running that way all night every night strains the spine. In a big enough wheel, the back stays level from head to tail. Young hamsters grow, so buy the adult size from the start.

Solid Surface, Not Rungs or Mesh

Wheels with rungs, bars or wire mesh can catch toes and legs. Choose a wheel with a solid running surface that is wide enough for the whole body, with no gap between the wheel and its stand where feet can get trapped.

Syrian vs Dwarf

• Syrian hamsters: at least 12 inches (30 cm) across. Many keepers go bigger.
• Dwarf hamsters (Campbell's, winter white, Roborovski): at least 8 inches (20 cm). Roborovskis are tiny but run a long way and enjoy a larger wheel if they can turn it.

These are PDSA minimums; check with your vet or an experienced keeper if you're unsure.

Noise and Night Running

Hamsters run mostly at night, sometimes for hours. A well-made wheel on good bearings is much quieter. Set the wheel on a firm base in deep bedding, and check it doesn't wobble or rub. A squeaky wheel is usually fixable, but a wobbly one should be replaced.