Winter wheels for a Golf R from VW are listed as optinal extras in other countrys are as follows
Alloys "Meribel" 6 J x 17 with 205/50 R 17 tyres.
I'm surprised 17s will go over the R's brakes - but there you go.
I would probably have gone for 17s for winter, for my own car, but I have my eye on some bigger brakes and they need 18s to clear...and I'm sure as hell not changing brakes and wheels every winter!
18s will be just fine, as long as the compound is correct...just not offering as much protection for the rim as a 17 (smaller sidewalls and all that...) should you slide on ice and thump one. I covered that eventuality by having a 'hot standby':
