I tried a race king and a rubber queen. First the race king. Pros: Very light! tread will last a long time Cons: Bad grip, sidewalls fold when going off camber, sidewalls rebound too fast (makes the front wheel harder to keep in one place, bad when riding small rocks), punctures easily. As you might guess, I didnt think much of it, Maxxis tyres are better in every way except weight. Rubber Queen: Pros: Again, very light! bouncy for sidehops. tread should last better than maxxis Cons: not as grippy as a maxxis, too tall for such thin sidewalls means it folds easily (I wouldn't dare gap to a slope with one). Not as puncture proof as a maxxis, not as predicable as a maxxis. I was really interested in trying this tyre when I saw Thomas Oehler with one. First impressions were how light it was! I had a quick prod of the knobs to see how soft they were, they were not as soft as a maxxis and the rebound was also faster. I found that in use, the grip was ok, not as good as a maxxis, but I was on grippy rock. As soon as I went on anything off camber, the tyre would just fold! I had slightly more psi than normal, but it didnt seem to make any difference! I couldnt go on my back wheel on any off camber, thats one thing maxxis tyres are great for! to sum it up, I still think maxxis are the best tyres out. Sure they are heavier, but that weight rewards you with stability and predictability on slopes and pointy objects. The Rubber queen was ok, but I think there's more important features to a tyre than weight. The Race King was just crap.