I couldn't find a thread on this topic, so hope I'm not repeating.
I have a 2017 S AWD and plan on putting snows on for the winter, in case I'm caught out there in bad weather ( live in Canada).
I plan on buying new rims, Storms in all black, no machine faces doesn't like winter salt.
I have decided on Continental Viking 7 and they do come in 255/35/20 which is exactly 27" diameter just like originals.

The problem is the back rims are too wide (10.5") for this tire, so I'd like to get the same as the front which are 9", hence a square setup. That way I can also rotate the snows for wear.

The question is will the front offsets ( I believe 55mm) work on the back without any rubbing and how would they look cosmetically?
Would they be noticeably inside the fenders, being a thinner tire and larger offset?

Any help from the members who have tried this would be appreciated!

 

They will fit easily with zero rubbing but they will look way tucked in.
You could always fit spacers on the rear to bring them out but you would need at least 17 mm thick otherwise you would need to cut or grind a few mm off the studs for the wheels to fit over them.

 

So other than cosmetics this setup will work without spacers?

 

Yep, it will work.
In fact I have read that skinnier tyres work better in the snow.
That said I have never driven in or on snow in my life and I have never fitted winter tyres!

 

Skinnier tires do work better in snow in that they concentrate the weight of the vehicle for better bite and traction on snowy and icy surfaces.

 

Regarding your comment on skinnier tires being better in the snow, that is indeed an accurate comment. Driving in snow or ice, you need the heaviest ground pressure you can get thus the narrower tire width will be the answer. Conversely, if you drive on sand or dirt roads in he summer, the wider tire is the answer for the lowest ground pressure. So the answer to winter snow/sleet/ice type tire, get as narrow as you reasonable can.

 

If it were me, I wouldn't run 20's in the real winter. I'd be looking at a 19" setup which is also 1" less wide front and back and run Alpine's.

 

Don't be a square! Truly though, make it easy on yourself and drive another car in winter weather. I fit PS A/S 3+ tires to my car and it's fine when it's below-freezing and dry. But I won't risk this car in poor weather. If you really want a wintry F-type experience, go to Sweden where Jaguar has an ice-racing academy on a frozen lake. They fit metal bumper guards to the F-types and you can drift to your heart's content in someone else's car.

https://www.jaguarusa.com/experience...den/index.html