SubscribeIf the punctures are always in the side of the tire, then somebody is doing it. If you tend to bump against curbs, the somebody is probably you. If it isn't you, someone doesn't like you.
If the punctures are in the part that touches the road, you're driving over nails or screws. (Many of those holes can be patched, but a lot of people say they shouldn't be.) Roofing nails and drywall screws are the most common and effective tire-biters, and roofers are known for being casual about depositing and cleaning up old nails. Try to avoid the driveways of houses with new roofs or new interior walls.
The most common cause is corrosion on the wheel where the tire sits, or where the valve stem goes through the wheel. (The stem is the rubber post you can see; the actual valve is hidden inside the stem.) Bad valves could also make a tire go flat, but I don't think I've ever seen it.
The someone who doesn't like you could also be loosening the valve, which would act like a leaky tire.
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posted by tiamat at 12:29 PM on November 26, 2006