Tire dry rot
Tire dry rot refers to the cracking and splitting that can occur in the sidewalls or treads of rubber tires as the rubber ages and becomes brittle. It’s also known as sidewall cracking.
Ozone and ultraviolet (UV) light are the primary environmental causes of tire dry rot. Tire manufacturers blend chemical ingredients into the tire during the manufacturing process in an effort to combat dry rot caused by ozone and UV exposure. Carbon black is added to the rubber to protect the tires from UV light. Waxes are added to the rubber during tire manufacturing to protect the tire against damage from ozone.
Why vintage cars are particularly at risk for tire dry rot
Vintage cars are particularly at risk for tire dry rot because they are typically driven infrequently, and may be stored for months at a time. Similarly, RV tires and boat trailer tires may dry rot long before the tread is worn.
The two primary causes of environment degradation of tires are UV and ozone and both may impact vintage cars that are parked for extended periods of time. UV rays damage any rubber that is left exposed to direct sunlight. Ozone will degrade any rubber that is exposed to the air.
Protecting the tires on your vintage cars from UV and ozone damage is a process.
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