If you run it on asphalt, the 606 lasts longer. The XCMH is fine on hard ground, but let a few bikes go across a dirt trail, and the dang thing just gives up. Give it half a chance to spin and it will. The last time I rode SV with you was the most frustrated I've ever been on a bike because of those tires. I thought it was me, but when Uncle Jesse could'nt get my bike up that hill, I knew those tires were shit. Needless to say, the next rear tire will be something for loose ground. The XCMH front tire has no problems, BTW.