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One of the reasons radial racing slicks are so effective is because they feature shallow tread depths and their contact patch acts as a single unit. However, any tread design that breaks up the contact patch into smaller elements or adds additional tread depth (required to enhance wet traction) will increase tread block squirm and reduce dry performance. This means that tires typically provide their worst wet traction and their best dry performance just before they wear out. It’s also important to remember that the heat generated every time a tire is driven activates bonding agents in the rubber. As this process is repeated continually throughout the tire's life, its rubber compounds gradually harden and lose flexibility reducing the tire's grip. Therefore, a shaved new tire will provide more traction than a tire worn to the exact same tread depth after being driven for thousands of miles on the road.
Tire shaving is an effective means of permitting more of a tire's performance capability to be realized early in its life. And in many cases, shaved tires used in competition actually have a longer useful life than tires that enter competition at full tread depth.
The process removes tread rubber and reduces tire weight by several pounds. A shaved tire's tread profile will usually result in a slight increase in the width of the tire's contact patch putting a little more rubber on the road. The resulting shallower tread depths reduce the tire's slip angle, increasing its responsiveness and cornering power by minimizing tread block squirm.
Minimizing tread block squirm also reduces heat buildup and the risk of making the tire go "off" by overheating its tread compound. Depending on the severity of overheating, the overworked areas of the tread compound may turn blue, tear, blister or chunk.
So with all of these benefits, the next important questions are: "Which tires need to be shaved? “How far should they be shaved?"
Since they are not purpose-built for track use, most of these tires begin with 10/32" of starting tread depth. Our experience is that shaving them to no more than 6/32" of remaining tread depth will provide a noticeable improvement, while shaving them to approximately 4/32" will allow them to run even faster lap times. However in all cases, tread temperatures should be carefully monitored to assure they don’t exceed 210° Fahrenheit and that there is relatively even temperature distribution and wear across each tire’s footprint to reduce the risk of overheating or blistering the tread compound.
It's also important to remember that once used, all tires will be a little less effective during the next competition season. Therefore we recommend that tires be shaved to a depth that is sufficient to last for no more than one competition season. If it is very important to you to do well in the one event you run a year, running tires shaved to about 4/32" will further enhance your performance.
The following tires are manufactured with only 4/32" to 4.5/32" of molded tread depth and do not require tire shaving for autocross or track use.
Most other Track & Competition DOT tires begin with 6/32" to 8/32" of molded tread depth. While some tires do not require shaving for dry autocross use, all of them will benefit from shaving to about 4/32" tread depths for driver's schools, track days and competitive track use in dry conditions.
|Dry Autocross||Dry Track|
|Michelin Pilot Sport Cup||Optional||Optional|
|Michelin Pilot Sport Cup+ /N-Spec||Optional||Optional|
|Pirelli P Zero Corsa System||Optional||Required|
|Toyo Proxes RA1||Recommended||Recommended|
|Toyo Proxes R888||Optional||Optional|
|Yokohama A048 LTS||Optional||Optional|
|Yokohama A048 M||Optional||Optional|
|Yokohama A048 MH||Optional||Optional|
NOTE: Depending on the severity of the track surface and layout, vehicle setup and performance, as well as ambient air and track temperatures, Michelin Pilot Sport Cup, Pilot Sport Cup+ / N-Spec, Yokohama A032R H and Yokohama A048 tires can be track driven in dry conditions without shaving.
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