It's hard to give an approximation. Chins will continue to surprise you in this manner. Many times when i looked at my kits and thought 'na.. shes way to big to fit though now' and then the next thing i no, shes slipping right through them again.
Also a warning in this; You want to make sure sure the chin is definitely big enough not to fit though. Iv seen kits try to fit though 1 inch bars and get stuck half way though.
I don't wanna scare you or anything, but better safe then sorry.
Most of quality cages give you the option of having the 1/2 inch spacing - have you double checked?
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