I see that the Pana Fire XC Pro gets very good reviews... Are they as good as they say? How are they as a front tire, coupled with Python rear? Weight? I was intrigued because I saw that the kevlar bead version was inexpensive. Are there variations of the Fire Pro XC, besides the size? Any feedback is appreciated....I am still looking for a nice front tire to couple with the Python on a Racer X. . . hardpack, singletrack...some loose soil and sand.