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With their square links and diagonal pattern, these easy-to-install, self-tensioning, alloy steel chains offer superior traction and a smooth ride. Specially designed for vehicles with limited wheel well clearance. How to Install pewag Servo RS Snow Chains Spread the chain around the back of the tire. Connect the cable on the back side of the tire. Pull the chain over the top and around to the front of the tire. Connect the servo device to the inner, tensioning chain with the top-mounted, dual hook. Fit the chain around the tire, making sure that the servo is in the front. Connect the inner chain to the outer traction chain at the bottom of the tire using the large red hook. Activate the servo device to ratchet the chain tightly into place. Class S Designation SAE Class S tire chains are designed for use on vehicles with restricted wheel well clearance. Certain newer cars, vans and small trucks, especially those with large, aftermarket tires, may require the use of Class S chains. These chains will fit your tires provided there is both A - a minimum of 1.46" (37 mm) between the top of the tire tread and the wheel well B - at least 0.59" (15 mm) between the tire's sidewall and the vehicle itself How to Choose Snow Chains for Your Vehicle To choose the right snow chains, you must match your tire size. Those measurements can be found on the side of your tire, as shown below. 185/60-15 (185) - indicates the width (60) - gives you the aspect ratio (sidewall height as percentage of width) (15) - denotes the diameter of the wheel rim in inches