I don't have an answer to your question, but am interested in this also.
While not well experienced in these sorts of things, I did have chains on tyres of a car (non-VW) I was driving to the snow at Lake Tahoe in the USA last year - and they scratched the wheels to buggery. Is this a common experience? Incidentally, I didn't fit them myself - they have rangers that do it for you (for a fee), so the scratching wasn't on account of my wrongly fitting them.
Also, is my R36 good to go in the snow as-is, or does one need to fit snow tyres sometimes? Again, recalling my experience in the USA, the rangers enforced different requirements for different weather conditions ... Condition Level 1) Any vehicle with any tyres OK, 2) 4WD vehicles OK with any tyres but non-4WD need chains, 3) 4WD vehicles with snow tyres or chains OK, non-4WD need chains.
If there are conditions where snow tyres may be necessary, I might just fit them in advance to avoid the possibility of chains scratching up my wheels when I go up this winter!
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