Originally Posted by Mr GCSRT8
The Grand Cherokee SRT has Run Flat tires for side wall stiffness. if you change to non-Run Flats you will have much softer side walls and handling will negatively affected. The Pirelli Scorpion Verde 4 season should last 36K if you rotate the tires every 6000 miles. The Pirelli P-Zero 3 season will last about 24K. This assumes no track time.
While I agree, run flats are a stiffer tire by design I'm not so sure the comment "much softer sidewalls" holds true across the board. As for handling, I can reference numerous examples where run flats were replaced with top shelf performance tires on cars such as corvettes and handling significantly improved. It really depends on the individual tire. In general I would say that some of the ride and handling characteristics of the SRT will change when going to a standard tire but I firmly believe the run flats they put on the truck are more a detriment than a positive with respect to ride and yes, handling. I'll reference my 2004 Porsche Cayenne TT as an example. It didn't have run flats, it had SUV specific, high performance Conti's and later, Michelin's. both tires had a significantly better ride than the Pirelli's on the SRT yet still managed to allow that beast to turn autocross times within 5 seconds of my tricked out Boxster. The SRT OTOH has yet to get within 6 seconds of times I set with the Boxster. The belief that somehow the SRT needs the stiffer run flat sidewall to be safe is total BS. I'm not saying you believe that but it's been stated in other threads, both here and on the red site that the run flats are required because of the weight of the truck, that's simply not true.
The problem we have is, in the tire size we have there is only one performance tire, the BFG KDW2. I'm between that tire, @ $260 per copy and the Toyo STII at $160 per copy. I'll decide in a few weeks but I'm leaning towards the Toyo simply because I don't track or race the SRT so whatever ultimate grip I may sacrifice I doubt the Toyo will be any less grippy than the Verde's that are coming off.
As to the mileage expectation, I can tell you that I am a fanatic regarding pressures, alignment and rotation and my 4 season Verde's are down to 20% with 14500 miles on the clock. I do tow a fairly heavy 16' enclosed trailer and about 4000 of those miles are with it in tow. I blame that extra load (weight distributing hitch so both front and rear bear the weight) with the reduced mileage. That, plus the cocina filler Florida uses in their older road surfaces which really takes its toll on tires.
Remember, the SRT has run flats for one and only one reason, they initially were not going to supply a spare because the front brakes will not allow any standard steel wheel to fit. For whatever reason they added the spare with the caveat that it won't for the front so if you have a flat on the front you need to put the spare on the rear and move that good rear to the front. It makes for twice the work on the side of the road.