![]() Tread Forming on a Tyre caused by Rebound DampingĪ good way to determine whether the rebound damping is too stiff or too soft is to take a look at how the tread on the tyre is forming. However, as is often the way with suspension, it can also mean that the rebound is too stiff. Your rebound stiffness on the damper is likely too soft and is allowing the tyre to bounce instead of remaining in contact with the road surface. If the strip of graining also gets wider and thinner as the tyre rolls around then this is a further sign that your dampers need adjusting. If the strip starts and stops this is a sign that the dampers need adjusting as the tyre is hopping and skipping around the corner. Roll the tyre round observing the strip of graining. The first check is to see if the graining pattern is consistent around the circumference of the tyre. If graining continues after understeer and oversteer has been solved then you must first look at the pattern of the grain to see if it is suspension related, geometry/set up related or pressure related. If you are experiencing oversteer or understeer then solve this issue first using tips in the article linked at the bottom of this article. One of the most common causes of graining is oversteer or understeer where the compound is dragged in a particular direction, scrubbing the surface, overheating the compound and causing the rubber to shear and begin to grain. Graining is formed by overheating caused by friction with the road surface and is a heat that starts at the contact patch and works into the compound. This produces a very uneven surface and damages the integrity of the compound, reducing grip specifically in corners and during braking. It occurs when strips of rubber begin to separate and tear away from each other and then fuse back together due to the heat of the tyre. Graining represents itself as a ripple effect in the rubber like many very small tears in the surface of the rubber. ![]() One of the most common tyre defects seen track side is graining. Tyre Graining Shown on This Slick Tyre Graining Some of the solutions are the same for different problems and parts of the tyre so some repetition occurs throughout the article in places. This article is designed to be used as a diagnosis and solution user guide where you can go straight to the problem you are having and resolve it quickly. ![]() Although these two factors do play a large part and often are the culprit, there are many other solutions that must be considered and attempted to improve the tyre performance of your car. Tyre failure is often misunderstood and ruled out as a compound or a tyre pressure issue. There are some key visual signs of the tyre breaking down that can help you diagnose the reasons why the tyre is failing and help to overcome and increase the life of the tyre. This article will help you understand what causes tyre failure.When out on circuit, the consistent high demand from the tyres can cause them to become defective, overheat and start failing. Therefore, all of your set up, corner balancing, driving techniques and coilover choices come down to the four contact patches with the ground through your tyres. This is because they are the only point of contact that your car has to the surface it is driving on. Tyres are a very important feature of vehicle set up.
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