Dubro makes good wheels that will absorb energy pretty well, but they are fairly heavy. Probabaly on the order of 2-3 times heavier than their foam counterparts, given the same size wheel. They are also wider. I found this out when I installed a dual strut front gear in my contender, and the 3 1/2 inch dubro wouldn't fit between the struts. Had to go to a smaller tire, but will eventually replace with foamies!