I have nothing bad to say about Razrs. I've ran the originals, Razr 2's currently on my 700XX, iRazrs, and MXR4's. They always hook up, and my Razr 2s will grab anything near them and chew it up. That could also be from the 700XX, but the tires are very aggressive, and noticeably heavier than the original Razrs. Which again, doesn't mean much to my 700XX. Sometimes they are actually to aggressive, in which case I will just throw on my stock tires if I feel like spinning and sliding everywhere, lol. For the 400EX, I would definitely get another set of Razrs for it. But, its alwasy your money and your machine, so it wouldn't hurt to look at other brands also. I hear the Kenda Cutter tires are very good as well.
The only time I have gotten stuck with my Irazr's is when i got caught on my skid plate and my tires were just spinning in the water. They do great climbing on their sidewalls and still slide amazing through the corners. I have had rider's complain about the roost they throw!!
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