I saw a new 2007 in Fire Red with Pueblo Gold on the bottom the other day, and I am not sure if the factory 20's really look that great to me. From any distance more than five feet, they just look plain, like the old argent rims of the late 80's. They just seem to have no flash, and look like plain old weathered aluminum. The machined strips may add a little, though. I really was hoping for some nice 20's on my next F-150 Supercrew, but can't really decide if they look that great. I almost think the tan painted 18's look better, and certainly the chromes do. Are there any advantages to 20's? How is the Perelli rubber? With the sidewall height being shorter than the 18's, I assume they ride rougher. Dis the old "flat spot" issue go away, or are any of you still experiencing flat spots with cold tires? Thanks. Smoke.

 

I have the 20's and yes they do still flat spot when cold, but after a few miles it will go away, the owners manual even has a page about flat spoting on the performance tires and that it will go away in a few miles which they do.
The ride is rougher then with 18's but that going to be expected with the sidewall height being reduced, in all I am happy with my wheels and tires, pot holes and manhole covers can be a bit rough but on a smooth road it rides like a caddy. The Pirelli tires are very good in the rain and the dry, one of the best tires I have driven on as far as wet weather traction, quite ride on the highway.

 

I like the look of the twenties on the truck but for several reasons I would stay away if I had to do it over. Since new I had some vibration on my truck and had the tires road force balanced. Out of the four tires I had 2 that were marginal at best and had one that was beyond acceptable limits and had to be replaced. That is 75% non conformance on the Pirellies and that type of quality should be avoided from any manufacturer. I suspect that if Ford had that type of quality we would all be on another board. There is still the flat spot issue with the tires and it takes several miles to work them out when first starting out. I think that the tires do look good, handle excellent and seem to wear fine with 10,000 miles on them. I also believe that they get very good ratings on the traction in both wet and dry. I spoke with the shop where I had mine balanced and they said they had seen quite a few problems out of the Pirellies. The only other issue to consider is the cost and availibility of the replacement tires for the 20 inch rims. The selection is almost as bed as the 18 inch tires and is expensive. Just my opinion.

 

They do pick up rough road spots easier, but curve handling and overall ride is great. The first few miles every time I start driving bites though. And I wonder if some new shocks would help some of the rear end bounce? Although I think that might change when I put My fiberglass cover back on.

https://www.f150online.com/galleries....cfm?gnum=5754

 

I was building a truck online and if one put on the 3.55 rear end it automatically defaulted to the twenties and wouldn't let you get any other rim except the twenties. Don't know if that is a bug or not.

 

been pretty pleased with my factory 20's .. I have a small issue with flat spotting .. but by the time I get out of the parking garage from the 5th level, then down the access rd and up onto the highway.. they are fine.. (or on te street from the house)

I had a small vibration issue when I first bought the truck, but they rebalanced them with the road force balancer, and not a single issue in the 4k miles since then.

 

I've had the 20" Pirelli's since January. 19000 miles and they've been very good to me. If they flat spot, they smooth out within a couple miles. They are wearing like iron. At 19000 miles you can just start to tell that they aren't new anymore. They look like they're going to go over 60000 miles without problem. I'd like to go with the Perelli 325/60 20 when they finally wear out, but by that time I'll probably change my mind. The truck corners like a sports car with the 20's and bilsteins. Bill

 

...i noticed that too.....had 3.73 s set then selected the 20s & i got the warning box that the rearend would be changed to 3.55........gotta be a gltich like you say.