I've been running 2.35 Minions on my Bullit for agressive trail-riding but the climbs kill me with the weight and rolling-resistance. I have a set of 2.1 Crossmarks and a set of 2.1 High Rollers (both have usual signs of fr/rr tread-wear). I'm playing with the idea of mixing the tread patterns using the better tire from each set. Crossmark up front or High Roller up front? It's kind of an experiment. . . anyone want to chime in?