RV Repair Manual
for the RV Do-It-Yourselfer
One of the most overlooked components of any recreational vehicle is the tires. Since tires are constructed from rubber compounds, natural degradation occurs over time. When anti-aging chemicals and essential oils in the rubber evaporate, the tire loses flexibility and becomes brittle. As chemical bonds break down, dry rot occurs – the rubber fades from rich black to dull gray, and fine hairline cracks develop across the sidewalls and tread grooves. Driving on severely dry-rotted tires is unsafe; heat generated during highway driving causes degraded rubber to expand and fail unexpectedly.
For this reason, the tire industry sets a maximum replacement limit of 10 years from the manufacture date, with many manufacturers recommending replacement at 5 to 6 years regardless of remaining tread depth.
The most common triggers for premature dry rot are extended inactivity, under-inflation, and prolonged exposure to harsh UV sunlight and high ambient temperatures. Dry rot frequently plagues motorhomes, travel trailers, fifth wheels, boat trailers, and seasonal vehicles due to long storage periods between trips.
Inactivity prevents internal tire compounds from distributing protective waxes through the rubber matrix during normal wheel rotation. In addition, low tire pressure accelerates sidewall flex fatigue and cracking. Check cold inflation pressures monthly using a reliable digital tire pressure gauge based on the tire manufacturer's recommended load chart.
Vital information is stamped directly onto every tire sidewall. The Tire Identification Number (TIN) includes a four-digit Department of Transportation (DOT) date code identifying the exact week and year of manufacture. For example, a code ending in 1223 indicates the tire was manufactured during the 12th week of 2023. Always verify the manufacture date when purchasing new tires, as units sitting on dealer shelves may already be several years old.
Storage Tip: Park your RV on clean wood boards or rubber parking pads during long-term storage to isolate tires from cold concrete, damp soil, or heat-absorbing black asphalt.
Constant solar UV radiation accelerates thermo-oxidative degradation. To protect sidewall rubber from UV degradation, apply a non-petroleum spray protectant such as 303 Aerospace Protectant three or four times a year. Avoid silicone or petroleum-based dressings, as they can strip natural protective waxes from the rubber surface.
The simplest and most effective defense against sun damage is encasing tires in durable, water-resistant vinyl RV wheel covers while parked or in storage. Blocking direct sunlight prevents ozone deterioration and ensures tires reach their full service lifespan safely.
Protective wheel covers are available for single, tandem, and triple-axle configurations in various colors to complement your RV's exterior trim.