I use 35 to 58 mm wide tires, depending on what bike I'm riding. 35 mm on the cross check, a good weather daily commuter. Running 29 x 2.3 on the urban assault Karate Monkey. A do all commuter and often sees dirt. Nice to get 8 miles of dirt out of 20 taking the long way home. I just need dry trails and a little more daylight. maybe next month.