Best Overall: ONGUARD Brute STD U-Lock When you want the strength of a BRUTE, you go with this u-lock from ONGUARD. It is super-strong, built to last, with special protection against drilling attacks that makes sure your bike will remain where you left it. It’s pretty much indestructible and while most other locks on this list wouldn’t have a chance against a hydraulic cutter, the Brute bike lock actually holds up. This is the most secure lock we could find. Premium Pick: ABUS Bordo 6100/90 Folding Lock This one won’t beat our overall winner in terms of security, but it provides quite a lot more flexibility. Just to be clear, this lock is by no means insecure. It’s still one of the best rated locks on the market in terms of security and most thieves wouldn’t even try breaking it, as these ABUS locks are notorious for being pretty much unbreakable. Most bike shops recommend them and you can’t really go wrong with it. If you need a bigger lock than the Brute, the ABUS Bordo is the way to go. Budget Pick: ETRONIC M6 Self-Coiling Cable Bike Lock At less than $20, this is a great option for those who need a bike lock with plenty of length. The four-digit combination makes it easy to ...