The AD07 are not bad oem tires, they're pretty good in fact.
The problem is with the front tires. The 175 size front tires were designed to remove all trace of oversteer for less skilled drivers. The thing is, the Elise/Exige, like any other car, does most of its braking with the front brakes. With only 175 of contact patch, the braking power, especially on track is greatly diminished.
Then there this understeer designed into the base suspension/tires that definately hurt lap times.
I think 195 or 205 front AD07 would significantly improve the grip for both braking and turning.
But still, in base form, an ExigeS with base suspension/tires (if such an animal really exist) is not as fast as a real car with 425 of the finest american horses...
