I currently have a 2011 XC60 D3 RDesine front wheel drive running on 18" rims, I'm thinking of changing the rims to XC70 ones has any body done this and if so what size tyers did you put on.

 

The xc70 wheels from 01-07 have a larger hub bore, you would need hubcentric rings to make those roll without vibration, the hub bore is the same as yours on 08+ xc70 wheels - what's the part number on the wheel you are looking at?

 

wheel-size.com is a good ref site for wheel specs. As you will see, 2010+ years (and gen2 s40s) use the smaller center bore. You can use this to see what offsets and tire sizes were standard for various model/years.

 

Found these, will they fit.
https://www.ebay.co.uk/itm/133496290046