The factory 275 40 20 tires I think are WAAY to skinny and makes the wheels look like your ice skating. The 275 45 20 tire fills the fenders a bit more and gives a bit more of a smoother ride. Highly recommend this for your next tire change. Speed is fine, and do not get scared about ABS / Braking issues.

I went with Hancock ST, good price and seem performance oriented. First two pictures are BEFORE

 

AFTER!

 

The first number in the tire size is the width in mm. In this case you went from a 275mm wide tire to... a 275mm wide tire. The second number is the aspect ratio. You got taller tires, not wider tires.

 

Your speed calibration will be OFF....as the taller tire circumference will appear to be traveling slightly faster now.

 

It will actually be spot on as porsche speedometers are showing lower.

I have the same exact setup on both of my pigs for winter and it works like a charm, way better than 275/40/20. For summer, I'm running 295/40/20.

 

tks, i upgraded to 275/45r20 and like you said, waaaaay better, smooth ride as well!!!

 

hoover out those fender wells

 

275 45 is nice but I think BIGGER is possible

I would like more tire sticking out to protect the rim. I had to paint my rims already once from all the curb damage.

295 or 305 I think is possible

Gas mileage sucks already at 14-15 on a good day, so how much worse can it get?

 

Another convert here for 274/45/20. Speedo is spot on too!