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The D1000?
It's proven to withstand sustained angle-grinder attacks at least 20x longer than standard D locks.
Some thieves will take the risk for the more expensive bikes.
My downstairs neighbour's motorbike was stolen by theives from outside the house. Big FO Almax chain. Nothing he could do as there were ~8 of them outside threatening him with a knife if he came any closer. Took them 5 minutes to get through the chain. Police didn't turn up in time to stop it happening.
Not really. I'm just defending against the thief that is casually walking along looking for possible targets and hoping that d-locks and cables (and a relatively shit bike) are enough to make him dismiss it and look for another target. The fact my £300 commuter has a SON front hub and a PowerTap rear hub might make it stand out a bit more.
The pitlock skewers should stop the casual wheel thief. But any determined thief who wants the whole bike won't be put off by any of it and will just angle grind the lock off and ride away and deal with the security skewers/bolts at their leisure.