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U
Locks
Some U locks are stronger than others; make sure you buy a strong steel-alloy lock. If the manufacturer offers a warranty or insurance, register the lock and write down the lock’s serial number and when you bought it. For added protection, get one or more U-lock cuffs (such as Bad Bones); they can keep thieves from using a lever to pry open your lock. One drawback to U locks: you can’t lock up to thick objects such as street lights; for these, carry a thick cable.
Padlocks & Chains
The thicker, the better; chain links and lock clasps should be at least 3/8 of an inch thick. Look for locks and chains that are case-hardened—a process that makes them harder to cut.
Cables
Some cables are actually harder to cut than chains, because they don’t snap and thieves can’t pry them open. Use a cable at least 3/8 of an inch thick with a lock as thick, or thicker.
Ugly Bikes
In busy commercial areas, where thieves have lots of bikes to choose from, your bike is less likely to be stolen if it looks old or just ugly.