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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? (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:

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Safety is all relative, and depends on where you live. At my office, I see plenty of people with cable locks, even though they are known to be easy to cut, and yet still no bikes have been stolen. Some other places you wouldn't be safe leaving your bike unattended no matter which lock you choose. – Kibbee May 13 '14 at 17:59
I think one of the reasons why padlocks are not commonly used is that they are quite heavy and thus may damage the frame/paint job if handled carelessly. – arne May 14 '14 at 6:25
Well, they're usually typically significantly weaker than the mini U-locks provided with say, Kryptonite chains, and the weakest part of the system determines the strength of the system. Not to mention chains are often a poor choice due to their massive weight (and 1 or 2 U-locks used properly holds the frame and rim tight to the locking post, when possible). – Batman May 15 '14 at 6:28

10 seconds with boltcutters- either on the chain or on the padlock, and the thief will have stolen your bike. There are reasons why bike locks are designed the way they are- to stop/prevent this from happening.

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Not to mention the weight, which is much less of an issue on a motorbike. – alex May 14 '14 at 5:51
+1 to the weight of a chain+padlock, difficult to carry just on the bike as well. – AliGibbs May 15 '14 at 7:20
I can't vouch for original Abloy brass or brass-covered body (newer padlocks have differen body) surely hard steel shackle cannot be too easy for bolt cutters. Toughened chain should be too, well it's a question of what it was made for. – qarma May 15 '14 at 8:05
added video link in the question where much heavier lock is tested; lock gets broken by massive boltcutters, chain survives. – qarma May 15 '14 at 8:10
@qarma, why don't they make locks out of the same material as the chain? – Kibbee May 15 '14 at 13:58

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