Well 40cm is about 15 inches (a far cry from 2 feet) and I can see the front end decorated with snow and no doubt, as was my case, the wheel well entirely caked with snow as well as rotors. It's a shame we don't get the dynamic suspension as delivered to the ROW as I really could use an extra few inches of lift.
I entirely agree with you, and reason I mentioned it above, you should
never scrimp on getting the right tire for your driving conditions. Studded on dry pavement as you mention is a recipe for early tire wear, road destruction and stability issues whether you have 4 wheel drive, AWD, quattro or whatever.
I live in an area and face weather (with temp swings of 40 degrees in 8 hours not uncommon) that most people will never face so I thought I would give my take for where I live and what choice I made. Clearly for occasional run up skiing or intermittent snow condition, studded is not warranted. To wit, my other two Touaregs are on non studded tires. Two years ago we had snow followed by rain and our mountain road turned to sheet of ice in a matter of hours. Coming down on the air suspension Treg I did 3 360s and nearly went over the edge. I was lucky I was able to slam into a berm on the mountain side (rather than go over) and managed by raising the vehicle, having disabled ESP (and copious use of a shovel) to get myself out - well aided by a tow rope to a tree also helped.
Being one of the road commissioners for our 11 miles of road (we do our own maintenance since we're way outside the city limits), I closed the road until we could plow the ice off. Over 90 homes were blocked in until I managed to get a grader and dump gravel (we never salt here). Given that experience I made sure I got the ultimate tire for the RS5. And though the Nokian 5s (and Blizzaks') are great winter tires, when you hit ice nothing short of chains or studs will help. Ergo the studs and to date, as I mentioned, where I slow down on the latter I accelerate on the Hakka 8s.
siberian
PS Siberian clearing snow on his driveway...
bobcat2_snowplow
January temps (gauge only went so low...):
temp
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