Tire covers protect tires from UV rays and weather damage, extending their lifespan. Carbon black in tires absorbs UV rays, but it depletes over time. Tire covers are especially important for vehicles that are not driven frequently, such as motorhomes and trailers. They come in different sizes and materials, and spare tire covers are also available. Look for UV-blocking covers with a warranty of two years or more. Prices start at $20 USD for a set of two standard covers.
Tire covers, also called tire guards or tire guards, slip over your wheels to protect them from the weather and harmful ultraviolet (UV) rays that can prematurely age rubber. Unrated vehicles, especially those that are driven less frequently, are at higher risk of developing cracked sidewalls from sitting in the sun. Tire covers can protect your investment by blocking UV rays and slowing the aging process.
There is no greater enemy of rubber than UV rays and ozone. To combat these environmental effects, tires are made with a “competitive absorbent” known as carbon black. This compound is what gives tires their color. The molecules in carbon black absorb UV rays and convert them into heat that can be dissipated from the tire. However, over time, the carbon black depletes and the rubber turns gray and brittle. By shading your tires with UV-blocking covers, you are effectively extending the life of your tires.
Tires that sit for long periods are even more susceptible to UV damage because driving helps the tires remain flexible. When you drive a tire, the flexing of the rubber causes it to heat up, stretch, and work; A “kneading” process that agitates protective wax compounds that rise to the surface, keeping the rubber protected and in good shape. Without flexing, tires become prime candidates for premature failure. Add in constant exposure to UV rays, and the aging process speeds up.
While it’s good to know what’s best for a tire, it’s not always practical or even possible to park all vehicles and drive them regularly. Vehicles in storage or stationary, such as motorhomes and trailers, are at particular risk of developing tire problems. A good set of tire covers is the best option when garages are not possible. Coating the rubber with a UV shield will help preserve the natural oils and compounds in the rubber and will slow down the depletion rate of the carbon black.
Tire covers come in many sizes to accommodate all tires. The tire slides over the top of the rim reaching approximately one third of the way to the rear of the wheel. The front side of the tire extends like an apron to the ground to ensure no exposed rubber. Covers are commonly made of vinyl with a soft interior lining and rip-stop nylon stitching. Steel grommets attached to either edge of the bottom of the apron can be fitted with a bungee cord around the back of the tire to keep the cover in place, even in high winds.
Tire casings traditionally come in black or white, with some people opting for white to minimize heat buildup against the tire face. Others prefer black covers because they don’t show dirt and are easier to keep clean. It is important to note that not all types of material block UV rays. UV-blocking tire covers should state this on the packaging.
If your vehicle has a rear-mounted spare tire, you are also at risk of early destruction from the sun and lack of use. Spare tire covers can be vinyl or metal, and are designed specifically for rear-mounted wheels. Since these protectors are worn 24/7, they are often made with a custom logo or design to add a bit of color and flair. Metal spare tire covers usually incorporate a locking mechanism to prevent theft and will likely require a special order.
Standard tire covers are available at many auto parts retailers and outlets that specialize in RV equipment. Discount department stores also often carry tire covers, which are usually sold in pairs. Look for brands that offer a warranty of two years or more. Retail prices can start as low as $20 US Dollars (USD) for a set of two standard covers, while a single patterned spare tire cover can be $40 USD or more.
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