I worried about the same thing for Italy last year and ended just taking a pretty large long (3/8" x 6' I think) cable and a padlock. This was to lock up two bikes. Except for a couple of days in big cities, this felt like overkill. If it's just you a good U-lock would probably be sufficient.
Originally Posted by qqy
As I'm buliding my bike for an extended stay in Europe, I'm growing more and more concerned about it being stolen. I've built a fairly nice cyclocross/light touring bike which is sure to be a target for any bike thief. I've got a new Kryptonite U-lock and am even considering bringing a wire cable, in spite of the weight. I'm going to keep it indoors as much as possible and walk rather than take the bike for short trips around town. Still, I know that one mistake on my part and it's gone. Also, I'll be staying in hostels and B&Bs, so even indoors it's not very secure. Could any of you experienced tourers share some tips or allay my fears?