Most vehicle manufacturers have assigned a clearance class to all of their vehicle styles. This information is located in the vehicle owner's manual under "chains", "traction devices", "tires" or a related heading. It is very important to select a traction device that is compatible with the minimum class assigned to your vehicle. If you can't locate the clearance requirements of your vehicle in the manual, contact the manufacturer. Class "S" products also meet the requirements for Class "W" and Class "U". Class "S" is the Society of Automotive Engineers' definition of the least amount of space that should be provided around the drive tires of any vehicle to accommodate the use of a winter traction device. This space measures 1.46 in. (37mm) from the tread-face of the tire to the nearest obstruction and .59 in. (15mm) from the sidewall to the nearest obstruction. (See diagram below) The following chains meet the Class "S" standard: "Z-Chain", "Super Z LT" and some "Quik Grip" sizes (the details in the chain fitment search will display the class for each item). The following chains beat the Class "S" standard: "Radial Cable", "Super Z-6" and some"Sure Grip Z"sizes (the details in the chain fitment search will display the class for each item)The "Shur-Grip Z" or "Super Z-6" cable chains are quickest and easiest to apply and remove. The "Shur-Grip Z" or "Super Z-6's" special rubber tightener and light weight make it easy to deal with even in a snowstorm.
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