Re: ??Which Tires??
It really depends on what your doing, and what your needs are. ITP Holeshots will last almost forever, but they are the heaviest tire. The XC's are a little lighter, but will wear faster than the HD's. I havent tried the Razr2, but the original Razrs seem to work well. Its the lightest sport tire (thats 20") that I could find, and wears like most others.
Hope this helps.