Movielover
Well-Known Member
I'm thinking "change the tires" was humor/metaphor or idiomatic expression.
It's genuinely hard to tell with that poster.
Actually depending on the coaster manufacturer and type of materials used the wheels of coaster cars have to be monitored and changed constantly. You should see the storage space that B&M coaster have to store new wheels.
This article explains it pretty well!
https://www.coaster101.com/2011/10/24/coasters-101-wheel-design/