Check out this IS accessory that is currently only available in Japan. It is called a Snowcap and it is basically a cloth tire cover that performs the function of snow chains. The supplier sells them in the US under the name "Auto Sock" but does not sell the 18" rear tire size. It cost about $150 in Japan. Looks like a great idea for those of us with the 18" summer tires in colder climates.
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