I'm about to hit 20,000 miles on this Jamis Sputnik-my 3rd fixie. I ride a lot of gravel on it-local trails, country roads and events- 50 milers or so is the sweet spot for me. 40x16 gearing means I can make up just about every climb around here. 35mm Donnelly USH tires are great for city and gravel. Getting up there in age(over 60) but love riding my fixie more than ever!