Good evening to you all 

I been thinking to change my tyres from the standard 255 35 20. But I am unable to find out if I can fit a 275 35 20 with no detriment to the speedo gearbox and diff.. I'm thinking about the change as I been told that the rear tyres on my xf-s should be 275 35 20 

Can any one advise  

Xfrs standard tyres are bigger than that I think, can check, but would have thought they would fit. 

Rears are 295/30/20

I have the V6 3ltr D XF S with 20 inch rims I thinking that a wider tyre would.like so much better 

I currently have 255 35 20 on I want to know if I can put  275 35 20 on the rear and not cause any speedo problems gearbox problems or diff problems with the wider tyre 

Yes you can, 275's will not alter the speedo at all. 275 is the WIDTH of the the tyre, not the profile

The profile of a tyre is a function of the width of the tread:

The aspect ratio, or profile, refers to the height of the sidewall as a % of the section width. In our example, 55 means the height is equal to 55% of the width

So the wider the tyre the higher the sidewall will be resulting in a larger diameter and hence affecting the speedo reading.

 

Thanks i wanted to double check as everyone was saying increase or decrease of profile for a wider tyre  thanks so much