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One pic I found of the Avon showed a zig-zag tread pattern but no lateral grooves. Probably not the best for wet weather, but if you drive within the limitation it would work. Here is the tyre I have: [url]http://www.stuckey.com.au/new/d98j.jpg[/img] I was warned they would be noisy but only hear them when coasting...
I suppose if you can estimate how many track days and kilometres you cover, and how often you are prepared to replace the tyres, an experienced tyre retailer (motorsport oriented) should be able to give you an idea of the relative life you might expect. Given the long distance trips you do perhaps it would be a good idea to err on the side of wet weather performance and perhaps durability - it doesn't sound like you are racing to try to become the next Schumacher, but rather for enjoyment.
Yes actual vs theoretical size does differ quite a lot between brands and even different models.
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