Mini D Locks

Second, cutting the rear rim is much harder than you might think. Since the rim is under substantial compression due to the tension on the spokes, it would pinch a hacksaw blade tight as soon as it cut partway through. Then there are the wire beads of the tire, also difficult to cut.

Hmm, everyone seems to take Sheldon's word for this (including me, this is my locking strategy most of the time). I'd like to actually put it to the test against a big pair of bolt-cutters/grinder. You can bolt cutter spokes very quickly if you go for the cross, then tension goes away and the rim is a lot easier to cut.

The hacksaw example is bogus, cos no-one around here goes bike thieving with a hacksaw.