Why are bike locks so fancy, so specialised?
Would a small padlock, e.g. original Abloy make a good bike lock when connected to a chain?
http://simple.wikipedia.org/wiki/Abloy (first image)
Are there some common attacks that this combination protects particularly poorly from?
Chain may have to be of toughened (motorcycle) variety.
Video from Germany testing similar concept with a much heavier lock: