coming from a mountain biking background in my childhood, i never rode more than 20 miles at once. last week, i took my fixed gear on a sacramento trip, about 30 miles total. it was pretty fun, going on the big flat roads with a 48x15 ratio. i could've went longer, but my roommate was dying 25 miles into the ride. i'm looking to ride 50 miles, and slowly increase to 100 someday.