actually, plastic wheels are very unsafe for them, if they chew they can become impacted and die, also those run around balls, please stay away from them. not that every chin has to die from heat stroke using them, but they can, think of it this way, you have on a fur coat, and you are told to go running, you get very very hot, but you don't sweat.. whats gonna happen to you.. thats what happens to alot of chinchillas that use those. i wish they would put on then unsafe for chinchillas.
also, for wheels the leo one that someone mentioned is good if you can find one used, quality cage has good wheels, i have one on my sight, also there are the saucers and ed spins.. all great wheels. worth every penny.
good luck.