I spent big on a Steelcase Gesture chair last year, which has been great.
Recently though, it has making a lot of creaking noises. I think they are emanating from the casters more than anything. I imagine they've gradually been picking up floor dust?
After trying some WD-40, which didn't help very much, I emailed Steelcase to ask their advice.
They suggested spraying Lithium Grease on all visible joints.
I hope it works, because a creaking chair is the worst.