When I bought my Xantia it had Pug 205 1.9 GTi 15" Speedline alloys on it shod with 195/65 R 15 types made by some obscure outfit in Russia. They were too big as the rear tyres contacted the leading edge of the rear wheelarch when the suspension was on high setting. As they were nearly new on the car and being a little on the parsemonious side I put up with them until I got the fronts down to the wear indicators. In truth they were awful. I was delighted when they finally wore down and I could justify their replacement.
I planned to re-tyre the Speedlines with something that would suit my 205GTi as I intened to fit them on that. I got a set of Pirelli P6000 195/55 R 15 tyres. Only then did I discover that the "Pepperpots" on the GTi won't fit the Xantia due to the front disk size so the Speedlines and Pirellis stay on the Xantia. Not that I worry as the Xantia looks nice with Speedlines even if the new tyre are a bit extreme on a TD.
Until today I have not had a proper chance to try these new tyres. What a difference

I never knew just how well a Xantia could handle on good tyres. The difference is astounding and I'm still grinning after a good blast around the twisty stuff. Hustling the Xantia around bendy B roads is nearly as much fun as doing same in the GTi

The only difference is the Xantia is a bit more comfy doing it
I've no idea what putting 55 section tyres on 15" wheels has done for my speedo calibration but I reckon it's now a bit fast but then that is not such a bad thing in these speed camera times..
I don't care though. These tyres are a pleasure and I'm really enjoying them 8)