What happens if we put wider tires?

[kt1]

Other than the issues already addressed above with rubbing, there is also the issue of tramlining. Wider tires will have more contact patch with the floor and with such small vehicles like our Boxsters you'll have an issue called tramline. Your tires will grip with the grooves on the road, especially freeways where the roads there have lines in them for rain purposes. The car will veer in the direction of the line in the road.

I'm running 18x10 with 275 width tires in the rear and there's definitely the feeling of tramline.

[Benny986]

yup, if you go wider in the back, go wider up front too..

wider only in the rear = more of a tendency to under steer.

wider only up front = more of a tendency to over steer.

for me, i went way wider up front, left the rear alone. and i will bring the rear toe back in check to get the back to behave.

(I autox a lot.)