20 miles on a balmy 32-34°F day and got a flat otherwise would have went for 30 miles but it was a slow leak and I my front tire was so muddy I did not want to mess around with fixing as it would have been a nightmare. for the last 6 miles of the ride I had to stop and pump it up every 1/4 mile or so. got home and hosed the bike off and cleaned the tire up and it was small like really small sharp rock that was the culprit.