Bicycle Lock Vs Angle Grinder

Almot wrote:

Almost.
I saw a Youtube video, expensive bolt cutters with replaceable jaws, don't remember 3ft or 4ft, cost over 300 EU. Very expensive safety chain for a bike. He tried, and couldn't. Dented the jaws. After I've added up the total cost, I didn't bother to bookmark it. Such a chain costs upwards of $80 PER FOOT, a 3ft length will cost more than a pair of batteries, and it deserves a fairly decent lock around $100 - shrouded so that they couldn't get the bolt cutter on it.

Such sturdy chains do exist, and cost a fortune. I think senor Mex bragged recently :) about a piece of chain or cable that he salvaged from some aerospace or military place.

OTH, the problem with padlocks is that they can be picked, even the best ones.

I have been following a Locksmith (Wayne Winton) on Youtube. His videos demonstrate brute force attacks on security chains and locks.

For lock picking demos that show how easy some locks can be picked, either of these Youtube channels are good resources
BosnianBill or The Lockpicking Lawyer

After watching both, I will never buy or use a MasterLock padlock again. These locks are garbage security wise and can be opened with a zip tie. After watching Bill's videos, I was able to pick a few locks with very little practice.

The only locks that have any type of security against picking are the Abus 20/70 or the Abus 20/80 of which both are now used on my trailer. In this video, the Lockpicking Lawyer mentions the difficulty in picking these locks. If he and other pros cannot pick them, then the average thief is not going to be able to either.

Of course and as others have mentioned, a grinder with a cutoff wheel will cut through any chain or lock if a thief is determined enough. That said, multiple layers of security at home, such as driveway motion detectors that sound an alarm in the house helps along with door alarms from the same company on the trailer door.