CR tests a variety of locks with the tools commonly used by bicycle thieves Senior test program leader Bernie Deitrick plays the role of bicycle thief at Consumer Reports' Yonkers, N.Y., headquarters.

Using a traditional U-lock can be a hassle, as you have to pull it out of your bag, take it apart, then run its shackle through the bike's frame before putting it back together. The bike-mounted V-160 ...