When your lock weighs enough that carrying it about kills you, getting a second would be overkill.

Said it endlessly on these threads, will say it again, i guess, because so many people have not caught on:

Unless you are locking up in a really nasty neighborhood in a high-crime urban area ... anything at all will stop most thieves, because most thieves will not want to bother doing any serious work to steal a bike that they just want to joy-ride. meth-heads and crack-heads won't have the patience ... but thy might saw through a really cheap cable lock. Get a serious piece of chain---not big, but too big to break with a random branch picked up in the parking lot, and secure it with a reasonable comp lock. Fro $20 you will be protected fron 90-95 percent of thieves.

Any thief who Really wants your bike can take it. Hydraulic jacks snap u-locks, bolt-cutters cut chain, and even the ridiculous, ocean-liner anchor-chain stuff can be cut with an angle grinder. Thing is, unless you are leaving a $2000 bike out to be stolen ... the real pros won't take the risk to steak your bike. And the rest won't have the tools.

If your bike is in a location where random people won't walk by and see it, and where no one will be able to spend half-an hour working on it, or use something as noisy as an angle grinder .....

Hey, something else I have said .... you pay as much as you need to pay to Feel secure.

Your bike is never "secure." it can Always be stolen. There ore people on this forum who have had bikes stolen Out of Their Apartments. What you really buy when you buy a lock is a measure of peace of mind. Spend as much as you need to be able to not spend all your time away from the bike, worrying about the bike.

If you have all the stuff you just mentioned, and still don't feel safe, i suggest getting Three more U-locks and some two-inch chain and an air horn which triggers if the wheels are rotated. if that doesn't work, hire a security guard.