Why Do Car Tires Turn Yellow?
2 Answers
Tire yellowing may be caused by metal rust, dust, and oxidation of tire wax. Detailed explanations of the causes: Metal Rust: Brake pads contain iron. When the brake pads wear during braking, they produce iron powder. Over time, this powder rusts and turns yellow, causing the tires to appear yellow. Dust: When driving in areas with mud, tires can pick up dust. If not cleaned for a long time, the dust can change color and become difficult to wash off, leading to yellowing. Oxidation of Tire Wax: To protect the tires, a layer of wax is applied to the surface. However, in high temperatures, the wax can melt and stick to the tires. Over time, severe oxidation occurs, causing the tires to turn yellow.
As someone who has driven many older cars, I've noticed that tire yellowing is usually due to rubber aging and oxidation. Sunlight's UV rays are a major culprit—they accelerate chemical reactions on the rubber surface. Prolonged exposure to high temperatures and sunlight will hasten the yellowing process. Airborne pollutants like ozone also degrade tire materials. Additionally, parking in shaded areas under trees or near chemical plants makes this more likely. While this change is mostly cosmetic and doesn't significantly impact safety, if accompanied by cracks or hardening, it's time to consider new tires. I recommend gently cleaning tire sidewalls with a soft brush during car washes, avoiding strong acidic cleaners. Try to park in shaded spots when possible, and regular inspections can extend tire life, preventing premature replacement costs.
