what's a lock? I rode my tiny folder for 3 years and have NEVER locked it once. One time I needed something in a grocery store so I folded it up and just walked in and no one complained. I even took off my quick release pedals so I was like some weirdo with a walking stick and wheels. when going to work the bike is folded up and under my cubicle. I've heard stories from co workers who lost bikes and one who even had his wheel kicked and bent. I didn't need any of that hassle so I stuck with a folder and was never happier! Eventually I've gotten so used to the geometry that I just use it as my only bike since all we do we pootle around with friends and I don't race or do randoneering with it that would really call for a better folder