Kryptonite - Kryptolok series 2 Mini 7 offers the best balance of security, practicality and price. It is a  portable  lock to secure your bike in the street every day.  Kryptonite  also gives you a lifetime warranty on products that have defects.

If you’re only looking for a lock to protect your bike at home or at work, then the best choice is a thick, high quality chain lock, like Kryptonite - Keeper 785 Integrated Chain. Because they’re flexible, they’re usually much less complicated to transport than U-locks. Kryptonite  offers a limited lifetime...

Kryptonite Evolution Mini-9 offers the best balance of security, practicality and price. It is a  portable  lock to secure your bike in the street every day.  Kryptonite  also gives you a lifetime warranty on products that have defects.