Hi All,

I currently have 215 35 18 tyres on TSW Ribs alloys which make for a harshish ride. I'm taking my Coupe over Swiss, Italian and French Alps in September (Top Gear Greatest roads route plus some more...I cant wait to go!!)
My query is, as I would like a bit more comfort and my current tyres are worn, would 225 45 18 tyres fit under the arches and clear everything? I know the rolling radius is going to be larger but I'm not too worried about it.

Any one help??

18" = 457.2mm

457.2 + (215 x 0.35) = 532.45mm (current diameter)
457.2 + (225 x 0.45) = 558.45mm (new diameter)

532.45 - 558.45 = 26mm (total difference)

26 / 2 = 13mm (half difference)

So check that you arches can accommodate another 13mm on top of your current tyre.

My 16VT was fitted with 225/40 R18s when I got it and they rubbed the wheel arch liners at the front when the steering was turned.

Replacing with 225/35 R18's sorted it.

I am afraid unless you want to cut your car about you will need to go to 17's for a softer ride.

I use 245/35R18 but you may get rubbing from them also, esp on the rear arch. You would also require a 8" wide wheel as a minimum

225/45R18 will not fit at all

would 215 40 18 fit?

yes is my guess, but I don't know anyone who has tried it.

Cheers guys for the input, Think I might chance it and keep my old tyres and replace them when I get back. 3000 miles in 12 days should see them off!