Originally Posted by
tractorlegs
I use two locks, a coiled Masterlock cable and a Kryptonite Evolution 2 U-Lock. I lock the frame to (something) with the Evolution and then loop the cable through the wheels and frame and the (something). I've had the Evolution for 10+years, maybe it's getting old - but I still have my bike! Use a cable and a U-lock because people that have the tools to break the U cannot cut the cable, and people that can cut the cable won't be able to break the U. Unless someone wants your bike so badly they carry a lot of tools!
That's why I carry two locks as well. I figure that most bike thefts are a crime of convenience, i.e. they're someone at the mall, store, park, school, etc. who is too lazy to walk home and are looking for an easy way to get home. Or they're a junkie looking for something that they can "fence" easily to get their next fix. And therefore they're likely to only have the tools that they need to defeat one type of lock.
The only thieves that'll have the tools to defeat multiple locks will be the "pro" and sadly those we can't really do anything to protect ourselves from as they are determined to get what they want.