It's not on the listing but it looks like 3/4". If that's the case, it would probably be ok.
However, if those dimensions include the seed skirt, it is really not big enough. I see you're picking cages with playtops and seed skirts. Unfortunately most cages with them are made for larger birds. You'll have a hard time finding one that's both large enough and has appropriate bar spacing for a cockatiel.
Last edited by Jaguar; 06-18-2016 at 04:29 AM..