I'll have to look at that brand when the time comes to replace our very noisy one. (theinspiredroom.net)
I have seen the bearing be noisy one day and gone the next. (yourmechanic.com)
Chew toys (not noisy ones) are a great option, as they can lie in their crate and enjoy the treat without needing to move around too much. (petcarrierverdict.com)