The context of the following conversation is Sydney worries about blowing a tyre on the highway, she buys two spare tyres even though the car already has one.:
Sydney says I am really worried about getting a flat on the highway..
The friend responds Do you have a spare tire?.
Sydney responds Yes, there's one in the trunk..
The friend responds Well, you're set then..
Sydney responds Not really, I need more spares so I bought a couple others..
The friend responds There's no room in your car for three spares, though..