I would not go an 1" smaller in overall diameter, there is a lot of room in the wheel well to fill up and you may be surprised how small going only 1" smaller overall diameter may look when all 4 are on the Touareg.
Is there an option in your preferred tires that has a slightly larger overall diameter?
If you are not towing regularly the changed final ratio for cruising at highway speed will not be a factor
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