When should you change your tires?
user
It’s best to change your tires before they have a nail or other object embedded in them, and preferably before they have a flat.  It’s also good to change your tires every 6,000 miles, but don’t do this if the tires are worn enough that they could become damaged more quickly.
assistant
That seems awful quickly.
user
The ideal is to do it every 6,000 miles.
assistant
Are you sure?
user
I am absolutely sure.
assistant
When should you change your tires?
user
It’s best to change your tires before they have a nail or other object embedded in them, and preferably before they have a flat.  It’s also good to change your tires every 6,000 miles, but don’t do this if the tires are worn enough that they could become damaged more quickly.
assistant
That seems awful quickly.
user
The ideal is to do it every 6,000 miles.
assistant
Are you sure?
user
Yes, that’s what they said.
assistant
When should you change your tires?