[T3] sizing snow chains

[Greg Merritt <gregm@vwtype3.org>]

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	I'm going to buy a set of tire chains for the Squareback for 
a trip into California snow country.  (I'm required by law to have 
them.)  A listee highly recommended this style:

http://www.autosportcatalog.com/index.cfm?fa=p&pid=1046

Now, I can choose a size like "165/70-15" on that page, and get a 
result that I could buy.  However, before clicking "GO" on the 
selector, you can click on "Need Help finding Your Tire Size?", which 
takes you to this page:

http://www.autosportcatalog.com/index.cfm?fa=tire_size_info

Here it says,

''Many older European vehicles use a sizing standard called 
"Euro-metric" (185R15) . These tires, like numeric sizes, are 
expressed in two numbers: tire width and wheel diameter. The width of 
these tires is expressed in millimeters rather than inches. They are 
selected in the same manner as numeric tire sizes - leaving the 
second drop-down box vacant.''

When I go to the selector and leave the second field blank, choosing 
only "165/" and "15", I am told that there is no product available in 
the size I need.

	The tires on my VWs are labelled "165R15" and "165SR15", like 
the "Euro-metric" labelling they describe in their tire selector.

	I always thought that the lack of a middle number implied a 
"default" ratio of 70.

	Do I just buy the 165/70-15 chains, or are they likely wrong 
for my 165R15 Michelins?

-Greg

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