I rode the speed kings for the first time last sunday and they were great. It was tons of thick mud on the whole trail and they just ate it up. Pretty impressive. I hear the super sonics have a tendancy to get flats, so if you're a heavy or hard rider, you might want thicker tubes...or just the regular speed kings. I didn't get any punctures however. The forks are Fox RL or RLC. The 100mm on the Score from 2005 and the 80mm on the KK from 2006. They're fantastic. Just serviced the 100mm for the first time after four years, only because I switched the fork crowns around, but they were still running great after all that time.