A "good" rolled lip wheel can be just as strong as a wheel with a reinforcing ring. I used to race with Baja's years ago, I could go out and ride all the time and never have a problem. As soon as we raced on them, they would bend like butter. We would bend at least one a race, one race we bent all four! The rears were the worst, but we also bent a few fronts. I then switched to DWT ultimate's. Below is the link to the new front versions:
http://www.dwtracing.com/products/atv/alumilite/RokOut
In the three years I have ran those, I have bent three, two of them bent during me cart wheeling the quad in 5th gear pinned, the other after hitting a big rock at speed with a flat tire. Two of those three I stiil use to this day, they did bend, but not to bad. I have been amazed at how well they hold up for just having a rolled lip.
The difference between the X-Rex and Razr2 is just who sells them, tread patterns are exactly the same. Maybe the compounds are different? Not sure. I know I will be trying a set when I need some new tires, Maxxis just keeps getting more and more expensive.
crwh45, the Baja fronts are a pain to air up. I only ran the 4:1 offset fronts and they were impossible to air up. I actually had to notch the reinforcing ring on them to get to the valve, pain in the butt.
Doug