What is "Tire Dry Rot"?          
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To help reduce dry rot all vehicle custodians are urged to drive their assigned vehicles no less than 1 mile if the vehicle has not been moved during the month. This may help reduce dry rot and prevent flat spots from developing on the tires. In addition, this will be a good time to check out mechanical functioning of the vehicle.

Tire Dry Rot

Dry rot in tires is caused by intense exposure to sunlight and often occurs when an automobile sits for long periods of time, since part of the tire is constantly exposed. Rot, however, can occur in vehicles that are used every day as well. When trying to determine whether it is time for new tires, look at more than how much tread remains; also check for signs of dry rot.

The most common sign of dry rot in tires is cracking along the sides, since the sides of the tires have the most sun exposure. If there are cracks on the side walls, change your tires immediately.

Dry rot can also cause splitting between the tire treads. Tiny cracks in the treads may or may not be a sign of dry rot, and could just be the result of normal wear and tear. Small imperfections may not be a risk; however, if there is significant cracking, you should replace the tire.

Browning or yellowing of the tire is a sign of advanced dry rot. These tires are in no way safe. Do not attempt to drive on discolored tires.

Read more: Signs of Dry-Rotted Tires | eHow.com http://www.ehow.com/list_7243840_signs-dry_rotted-tires.html#ixzz1eYxOxN7F