Q - Can I have a larger/smaller wheel? 

A - We researched quite a bit before we settled on the design and size for the Maclaw cat wheel, we consulted with our own Veterinarian and an Animal Behaviourist. The Maclaw wheel is large enough for a full sized male Savannah which is a larger sized and long legged pedigree cat and can reach weights of around 6 - 8 kg but our bearing system is designed to have free movement so that even the smallest of kittens can also use the wheel (under supervision of course). The Maclaw Wheel is designed to take a weight of 12kgs. Which in our opinion is large enough for most domestic cats both weight and running stretch.