Since we keep geeking on tires (guilty!) I chose Mavic tires (made by Hutchinson) Claw XL 2.5" front and Quest Pro XL 2.4" rear. Rims are Mavic XA Pro carbon 26mm internal. I measured the tires with my calipers, the 2.4" is 71mm wide, and somehow the 2.5" tire is 69mm. Strange, but whatever, we know those numbers don't really mean much. I haven't ridden the Quest yet, but it looks very much like the old Charge XL which I liked. The Claw is looking like more of a mud tire, very open and relatively small knobs. It actually rolls quite well, but it doesn't put a lot of rubber down on hardpack and it's side knobs are spaced too far apart for making a dam in sand. It will clear mud well and it bites nicely in soft ground.