The tyre size is 245/40/20. That's a 103 load rating. The alloys are 9", ET38 with a 20mm spacer on the rear to fine tune the fitment to the lip.
245/40 20 is very close to 275/35/20 circumference which VW recommend as the correct size for 20" alloys.
I don't have any issues with rubbing anywhere. It still gives me quite a bit of ground clearance. I use my van for a lot of fishing where I'm quite often driving down rough country roads with grass growing in the middle and I don't have any issues.
I was running 255/40/20 before that (when I had the B14 komforts) and they looked just a tiny bit too big and would have probably rubbed at the drop I'm at now.
Another pic from a different angle:
View attachment 201019