The Sweethome tested a bunch of locks, consulted with bike thieves, and sifted through other reviews and chose the best bike lock for your bike.
The consensus among those in the know was that a u-lock is best for virtually everyone, offering the highest ratio of security to portability. Unconventional devices like folding locks are intriguing, but so far none offer the security of a good u-lock. Chains sometimes offer a slight bump in security, but they often weigh twice as much and still relent to power tools. Let masochists wear belts of hardened steel; all our experts said a good u-lock is the sensible solution.
But before we talked specific lock models, they also insisted we slow down. Most people don’t know how to use their locks, they said. Most people buy big, heavy expensive u-locks and then don’t secure their bike’s frame, or don’t lock to an immobile object, or worse. Videos like this and this and this drive the point home.
Both the professional and petty thieves we talked to suggested that if a cyclist couldn’t take his bike inside, he should lock his bike in a different spot each day, making it harder to case out. And they encouraged people to ride cheaper bikes. After all, the resale value of a bike — and its expensive components — is what makes the thing worth stealing.