Just an idea for leaving your bike for a few minutes
[h=1]ABUS frame locks[/h]
Frame locks are basic security devices for almost any bike. These practical frame locks are light and quick to use to protect your bike against unauthorised use. They can be connected to other accessories such as chains or cables to protect your bike even more effectively against theft. The locks are available either with keys that can be removed when they are open or with keys that cannot be removed.
http://www.abus.com/eng/Mobile-Secur...ks/Frame-locks