It’s not uncommon for the sides of motorcycle or car tires to develop a yellowish or brownish tint, which can raise concerns for vehicle owners. This discoloration is often a result of natural processes rather than a defect or improper maintenance.
Today, I will take you to the tire shop and we will discuss why tires take on these hues, the underlying causes, and if need arises – how to address them.
Common Reasons for Yellowing on Tire Sidewalls
Some of the common reason why you may see the sidewalls turning that shade of yellow are:
Antiozonant Blooming
Antiozonants are chemicals added to tires to prevent premature aging due to exposure to ozone and UV rays. The yellow or brownish hue that you see on the side walls (often called “blooming”) is due to these chemicals moving on to the surface of the rubber with the passage of time. As much counter-intuitive it may sound but this process acts as a protective barrier. So despite affecting the tire’s appearance it can maintain the rubber’s flexibility and longevity.
Oxidation and UV Exposure
Just like any rubber product, tires can oxidize. Sunlight and air exposure can lead to oxidation, which may cause yellowing on the sides. Oxidation typically doesn’t affect the tire’s structural integrity but does contribute to aesthetic changes.
Environmental Factors
Beyond the internal factors mentioned earlier, things like dust, dirt, road salt, and pollution can also settle on tires, causing them to change color. I noticed this effect first on my trip to UAE, in desert areas or places with high dust or sand, these particles often leave yellow or brown tints on the tire surface.
Use of Certain Cleaners or Tire Dressings
Some products that are used to enhance the look of tires like tire cleaners and dressings contain chemicals that react with rubber that cause discoloration once they wear off. So, the blotchy sections you see on tires are due to inconsistent use of these products because of which the tires fade unevenly.
Addressing and Preventing Tire Discoloration
Although discoloration on the sides of motorcycle or car tires is common, there are ways to manage or minimize it:
Cleaning: Using a mild tire cleaner and a brush can help remove surface-level grime and blooming. As I always insist, harsh cleaners have no place outside of industrial use, so you should avoid overly harsh cleaners, as they can damage the rubber and contribute to further discoloration.
Regular Maintenance: A good driver pays attention not only to the quality of the motor oil in their car but also keeps a close eye on the condition of their tires. Consistently cleaning your tires and applying a suitable tire protectant can prevent excessive buildup of environmental elements. But don’t apply too much, as this can accelerate blooming.
Avoiding Curbs and Other Abrasive Surfaces: Did it ever occur to you that the yellowish stains could be from abrasion against concrete or other surfaces since your tires make contact with curbs? My advice, just be mindful when parking or maneuvering and you should be good.
Should You Be Concerned?
Discoloration is generally a cosmetic issue and doesn’t impact the tire’s performance. However, if you notice cracks or other signs of degradation alongside discoloration, it may be a sign of wear. In such cases, it’s advisable to consult a tire professional to check the tire’s condition and determine if a replacement is needed.
As we discussed, yellowing on the sides of motorcycle or car tires is a common occurrence that typically results from protective chemicals in the rubber and environmental factors. While the discoloration may detract from the visual appeal, it doesn’t usually indicate any serious issue. With the right care and cleaning approach, you can maintain the look and longevity of your tires, keeping them road-ready and looking their best.
