Locks that work

There is a psychological aspect to opportunist and amateur theft. If a bike LOOKS more easily nickable, someone (with an albeit smaller brain) will have a go. This then will leave a damaged bike.

I would recommend locking the rear wheel with the seatpost, or both seatstays, as it is then obvious how much cutting would need to be done to get the bike.

To defeat the Sheldon method.....Puncture the tyre, and cut the rim with an anglegrinder. I doubt this would take more than 5-10 seconds......as opposed to 3-4 minutes for the best locks.

There's a video by Northumbria police on Youtube that supports the Sheldon method, although annoyingly when it gets to the crucial bit where they demonstrate the wheel can't get out through the rear triangle we don't actually get to see everything we want to.

http://www.youtube.com/watch?v=r6xnkEkP2WY

The article linked below supports what GA2G and ed are saying

http://www.mechbgon.com/lock/index.html

In summary I think catching the rear wheel and the seatpost is probably the way forward, for me at least. Thanks everyone for their views.

Marco