mrhamamg

I ran a search and couldn't find anything on this so forgive me if it's been discussed already

I was looking at Tirerack to get a new set of Cup 2's for my 991.2 GT3 and noticed the Ferrari spec K1 Cup 2 R are the same size as our N1s. I'm looking for more grip and the Rs are obviously amazing tires, I'm just concerned about running non OEM tire on the car. Is there a downside to running these, both from the perspective of its a Ferrari spec vs Porsche spec and that the R wasn't designed for stock non-RS GT3?

Would be particularly helpful if someone whose run this setup chimes in

CDinSing

Delete

9914s

Don’t know the exact answer but a friend uses the Ferrari trofeo R on his GT3 without any issues.

3Series

If the tire fits on the wheel you are running, you are good to go. All this ' N spec' stuff is marketing. Each tire will perform differently per driver, car, track, ambient temp etc....Some will say Trofeo R's are sticker than Cup 2's but fall off faster in grip with less heat cycles etc....some will say the other way for Cup 2's. Tire choice is very personal.

As long as the tire is developed to compete against each other.

hellboy_mcqueen

This is not correct. Please make a search in this forum.
Porsche N-Spec 305s are almost same size as 325s with regular spec.

DK7

there is no Ferrari Trofeo R !

9914s

sorry then whatever cars has a trofeo tire. He get his tires from a Ferrari dealer.

mrhamamg

ya trofeo is like cup 2 or Dunlop’s. I’m just worried cup 2 R generate more force or something that’s bad for the suspension that’s the primary reason I’m asking this question

ipse dixit

Sidewalls are different.

mrhamamg

got it thanks, will stick with oem N1s

JCR-Porsche

You might be surprised

JC

DK7

you mean Cup2 vs Cup2 R ?
Whats your experience ?

groundhog

You have to look at the weight rating - Porsche have light front ends and heavy rear ends.

JCR-Porsche

Pista Cup2 R with K rating is the same construction as the GT3 sized Cup2 connect (245/35/20) (305/30/20)

Ferrari actually had no technical input into the tyres construction, this is a marketing spin. Car manufacturers make the cars, tyre manufactures make the tyres and unless it's a very specific and unusual application, think Veyron and Chiron then the manufactures simply develop and refine the chassis and handling characteristics around the tyre that's suggested to them. Koenigsegg are a prime example of this.

It's a common misconception driven mostly by tyre markings that its the tyre manufactures designing their tyres around the car. Kind of in the same way that you wouldn't imagine Tennis ball manufactures develop the ***** to suit the companies that produce the rackets

JC

JCR-Porsche

Perfect example to back up what i've said above, the load ratings on the K1 Pista Cup2 R is exactly the same as the N1 GT3 tyre. 95 & 103 respectively

JC