5.) They're Damaged
So... you're telling us damage is bad? Wow. Guess we'll have to stop carving "Jalopnik was here" with a knife into people's tires and calling it a PR stunt. Actually, a careful inspection for missing chunks of rubber, bulges (unsightly or otherwise) and evidence of curb or debris damage can keep you from having to call a tow truck when you're miles from home.

4.) They're Deteriorated
Not to be confused with damage, deterioration happens over time due to atmospheric conditions — mainly ozone in the air acting on the rubber to produce dry rot. Deterioration can be sneaky, resulting in weak spots that can lead to a blowout. Look for spiderweb cracks in the sidewall and a dull, dusty appearance to the rubber.

3.) They're Overinflated
Contrary to what your friend Jeff told you, inflating your tires well beyond the suggested pressure will not increase your fuel economy to 95 MPG.

2.) They're Underinflated
The corollary to overinflated, this condition is not to be confused with a "flat" tire (which is also bad). An underinflated tire doesn't just decrease your MPG, it can also lead to irregular wear. Want to know what the right inflation pressure for your tires is? Don't use the number on the tires — that's just the tire manufacturer's suggested maximum inflation pressure. Instead, check the sticker on the driver's door frame or inside the glovebox for the right pressure. Also, check the owner's manual.

1.) And the number one reason your tires fail is... (it's almost too obvious, but place your bets and check it out here.)

In all seriousness, the points themselves may seem obvious, but PopMech does a good job of explaining the hows and whys behind their top five failure modes, and they might just clue you in on something you've forgotten.

The system is notable because it doesn't need an external air compressor or any other hardware. Just by driving around (a mile should be enough to compensate for a month's worth of normal air-loss, according to the company), you'll keep your tires at their ideal pressures. Obviously, keeping your tires at the correct pressure is good for safety, economy and tire wear.

The Self Inflating Tire is currently being developed for production by Coda Development. With the ability to be incorporated either in the tire sidewall or rim, it should prove cheap and easy to produce. Tire inflation may not be the sexiest aspect of car maintenance around, but it's both incredibly important and oft neglected. SIT will be launched at the SAE World Congress in April. [Via SIT]