I have an 11" Wodent wheel and an 8" comfort wheel. Cleo used to have the Wodent wheel when she was younger when I upgraded her form her 8" inch wheel. I like the closed In Wheel but I prefer the idea of the slightly bigger openings on the 11" one (the senior, I think). Having said that, Pip has the 8" comfort wheel and he fits that just fine. I'm lucky because I don't sleep in that room, I'm not sure I could stand it if I did - it's a bit noisy! but he lapses once in a while and pees in his wheel. The Wodent wheel can be a faff if you just need to give it a quick clean so he can stick with the noisy wipe- able wheel for now
