[tober1]

I got a set of locking skewers for my commuter and a matching seatpost collar bolt. It's an amazing sense of relief not having to lock my wheels or worry about someone with an allen key snatching my seat.
The set uses a 5-sided allen key. Means I have to carry the tool, but it's pretty small and light.
It's a whole new world.

http://www.youtube.com/watch?v=-kl4hJ4j48s

 

[froze]

Yeah, their good, but as you say you have to carry a tool, what if by some odd chance you forget it or lose it? Why not just use a larger Krypto or OnGuard U-bolt lock and bring the front wheel to the rear center of the bike and lock both wheels and the frame to a secured pole? See this site for details as to what I mean: http://missinglink.org/Pages/bike_locking.html

Then as an option, an option worth doing, is to buy a thick covered cable and, in addition to the U-Bolt, snake it through the same area as the U-lock and lock it up with either a high quality lock like the Abus 20 Diskus, or lock both ends of the cable to the U-lock. Problem with locking the cable to the U-lock is that if the U-lock is defeated then they got both open, I like separate locks. Granted cable locks are the easiest to penetrate but by using two totally different kinds of systems, the thief would have to carry two different kind of tools, something they just don't do, they will move on to an easier target.