WHAT IS TYRE RUNOUT & HOW TO PREVENT IT
Tyre noises, and tyre vibrations, are a guaranteed way to ruin the driving experience of your vehicle. And, no matter how top-of-the-range your model may be, no car is immune to excessive tyre noises.
Unfortunately, the longer you ignore the problem, the worse it gets.
While several factors can influence the “noisiness” and driving quality of a tyre, very few motorists know much about ‘tyre runout’ and what causes it.
WHAT IS TYRE RUNOUT?
Also known as ‘out of round’, the term ‘tyre runout’ describes tyres that are no longer round or symmetrical in their fitment. What’s more, there are two forms of runout…
Radial runout: The distance from the wheel’s hub to the tyre’s circumference is varied and inconsistent. The greater the discrepancy, the more it will cause the tyre to bounce up and down as it rotates. This bouncing effect causes suspension vibrations through the steering column and into the vehicle’s cabin. It also results in irregular- and accelerated tyre wear.
Lateral runout: The distance from the wheel’s hub to the tyre’s sidewall is varied and inconsistent. The greater the discrepancy, the more the tyre will “wobble” left and right. This shaking effect causes vibrations through the steering column and into the vehicle’s cabin. It also results in irregular- and accelerated tyre wear.
WHAT CAUSES TYRE RUNOUT?
In most cases, tyre runout is caused by incorrect or sloppy installation practices at the fitment centre; an example of this would be the excess use of ‘wheel weights’.
However, it can also result from manufacturing flaws or poor quality-control commonly found in low-budget tyres made from inferior tyre moulds. The same is true of low-budget wheels.
Unfortunately, because tyre runout is self-perpetuating, the problem is likely to get worse as the runout becomes “ingrained” into the tyre’s wear pattern. Sadly, the problem is often unfixable once this happens, and premature tyre wear sets in.
In the unlikely event that a reputable tyre brand is manufactured “out of round”, the problem will/should be identified by the tyre dealer or fitment specialist. This is because an out-of-round tyre will be almost impossible to balance. Even if the fitter could get the tyre to run partially “true”, the chances he’ll be using far too many wheel weights to mask the problem.
HOW TO PREVENT TYRE RUNOUT?
If possible, try to fit reputable tyres backed by a comprehensive warranty programme and manufactured to strict international quality-control standards. It’s also vitally important that you use fitment centres that are well equipped in terms of modern machinery and experienced staff.
On that note, click here to browse a wide range of wheels and tyres, get an instant online quote (including fitment), or purchase tyres online and have them delivered to your nearest TyreLife recommended specialist.