No flat front tires ...

[StarTech]

Not all of us are thorn free for example. Here I repair several tires every year from Locust and Bradford Pear tree thorn punctures. One this year actually had a three inch thorn still in the tire. And there are other things that can puncture tires including common household staples and nails of all types.

 

[BigBlueEdge]

I guess I'm luck to not have those things around here.