tyre size

[Jaseb77]

Hi guys, I need 4 tyres soon for the S80.
Currently on 225/50/17 extra load.

If I went down a wee bit on profile would it upset anything ?.
Much more choice in 225/45/17 extra load

Any ideas ,

[local-looney]

got them fitted to my s60 with no issues...feel a bit over an uneven road but thats about it

[Jaseb77]

Kinda was wanting an opinion on the radius change, on speedo , gearing etc.
Would it also effectively be a modification ? In insurance terms. . I wonder

[AndysR]

Rolling radius will change as a result because you'll be decreasing the overall diameter of the tyre/wheel combination. This will mean it will change the speedo reading etc if only ever so slightly. Why change? Looking for a lower profile or is it tyre availability?

[Jaseb77]

Bit of both really, 225/50 are less available and expensive.
Would like a wee bit less roll- polly in corners too.
Asking bit much maybe from a S80?

[M-R-P]

Going down to 45 will make your speedo over read a little more than it already will (they all over read by 3-7% apart from ex-plod) so you're less likely to get a ticket. If you get good tyres then comfort and grip will be noticeably improved. I just went from Barum Bravuris2 225x45 zr17, which were a very good all rounder, to Avon ZV5 in the same size and they are superb and made a massive difference to the feel and performance of the car. All for an extra tenner per corner happy days.

[andybrown]

I just went from Barum Bravuris2 225x45 zr17, which were a very good all rounder, to Avon ZV5 in the same size and they are superb and made a massive difference to the feel and performance of the car. All for an extra tenner per corner happy days.

Im really happy with my ZV5's .... No wheel spin, bloody good at stopping and they are ace on corners