Reader asks about flat-spotted tires

Wheels: Doug. P of Centerville asks, "I have a vehicle that is not used very often but when I do drive it, it shakes as if the tires are square. I know you have to drive the vehicle about 10 miles before it rides normally. What is the most likely cause? I don't want to spend a lot of money on it just for this problem."

Halderman: The most likely reason for the harsh and bumpy ride is that the tires have "taken a set" from being parked. This is normal for many types of tires, especially high-performance tires that use an overlay ply over the steel belt. When the vehicle is parked, the tires "flat-spot" where they contact the ground and it takes a while until the tire becomes round again. If the vehicle is stored for a long period, this flat-spotting can become permanent and ruin the tires which would then require replacement. The least expensive thing to do is nothing. There are several ways to help avoid this issue including:

Overinflate the tires about 4 PSI higher than the door placard pressure to help reduce the amount of deflection of the tire.

If the vehicle is going to be stored for several weeks or more, consider using a curved platform where the tires can be kept round.

Use a jack and safety stands to raise the vehicle off the ground when not being used.

If replacing the tires, check that the material used includes polyester or rayon, and try to avoid tires that contain nylon to help reduce this flat-spotting.

Have an automotive related question? Write to Jim at jim@jameshalderman.com.

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About the Author

James Halderman