Everyday. I will occasionally ride my mountain bike if it is rainy, but I don't have a second wheelset, so I have to stick with the knobby tires. Granted, my primary is a steel frame/fork, but still my primary. I use two good size locks, and have never had a problem. I don't live in the city though. When I lived in the city I still used it everyday, but I used one of the Kryptonite New York Noose locks and didn't really worry about it. I just use a messenger bag or backpack depending on how much I need to carry.