Originally posted by onerichrunner
I am running the Nitto 555ZR's and feel they are not so good for traction. Cornering is just fine but seem to break loose way too easy. Any and all input from 18" experience appreciated.
I feel your pain. I've been looking for good competition tires for autoxing with the 18" wheels on my Panoz.
In short, here is my advice:
1. Stay away from G-Force tires. They suck.
2. For street tires, Pirelli P0 is pretty good.
3. For competition use, try Hoosiers. But they won't last on on the street.
4. Keep your eyes on Kumho, they will probably start offering more 18" sizes in the Ecsta V700.
Now the long answer:
Tire options for 18" wheels are limited. For competition tires, your choice is Hoosiers or Kumhos. Both are good on the track. The Hoosiers suck (don't last) on the street while the Kumhos can be used as street tires too. Kumhos are my first choice, having used them in the past on a different car with 16" wheels. But the Kumhos have VERY limited selection in the 18" sizes -- and don't make the sizes I need.
Currently, I'm using BFG G-Force R1s. But they don't stick much better than street tires. They are relatively sucky competition tires and have been discontinued because nobody was winning races on them. I got them because they were the only streetable competition tire available in my sizes. Now there is a street version of the G-Force, the G-Force KD. I have not tried them, but based on my experience with the G-Force R1 I'd stay away from them.
As for street tires, the Pirelli P0 tires are pretty good.