I recently wrote about the one true bike lock, but I didn't explain how to use it. Here is the post about how to use that lock.
- Use locking skewers for your wheels, and
- use your U lock around the rear wheel, inside the rear triangle
where to put your U lock
the U lock position
This method of locking a bicycle with a U lock around the rear wheel is known as The Sheldon Brown Lock Strategy. It's a little bit counter-intuitive. When you first hear/read this, it seems like a thief would be able to just detach the rear wheel and walk away with the bike. But the reality is that the thief would have to pull the rear triangle over the wheel, which is impossible without either destroying the wheel or wrecking the bicycle frame. Compare the diameter of the wheel to the size of the rear triangle, and you'll see it.
This position has the double advantage of securing the rear wheel and the frame while allowing use of the smallest U lock.
It is true that it is far, far easier to saw thru the rear wheel than to saw thru either the U lock or the frame. The fact is, though, that the rear wheel is generally the most valuable piece of the bike, after the frame. To destroy the rear wheel in order to steal the bike is very nearly a waste of time and effort. Thieves don't do it. If this changes, if thieves do start cutting wheels in order to steal what's left, then we'll revise this advice. Until then, this lock position is widely recognized as the best way to use a U lock.
I assert that locking skewers are a far better thing than a cable, or even a second U lock.
Commonly, people use a cable, attached to the U lock, to secure the front wheel. Or even, they may use a second U lock to secure the front wheel. I say that you're more likely to have a bicycle stolen (or stolen and never recovered) with either of those than if you use locking skewers.
In order to understand this, you have to realize that the purpose of all these things we do to "lock" our bike are really just deterrents. Mostly people want to buy locks to be 100% sure that the bike will not be stolen. They are looking to make the bike theft-proof, and it seems that, for instance, a second U lock on the front wheel will stop a thief stealing the bike better than having a locking skewer. That is to say, most people think that making the bike harder to steal is the one and only goal.
The major flaw in this reasoning is that once you've got one quality U lock on your bike, adding a second U lock only makes your bike twice as hard to steal. If your bike is being stolen by someone who can defeat one U lock, don't you think they can defeat two? If it takes them 10 minutes to get thru one, it'll probably take 20 minutes to get thru two.
The reason that people use a second U lock is that a cable is ridiculously easy to defeat. Putting a cable around the front wheel is definitely more secure than a quick-release skewer (the standard attachment method), but that's not really saying much. A cable is pretty much a token effort to not lose a front wheel.
Let's take a step back. The reality is that bikes are generally stolen so that they can be sold. There is an entire branch of bicycle security devoted to uglifying your bicycle in order to deter theft. By making a bicycle hard to sell, you deter thieves from stealing it in the first place.
The beauty of locking skewers boils down to this: locking skewers
- are better than a cable in preventing wheels being removed from a bike,
- are lighter and less hassle than a second U lock or a cable for locking up,
- communicate to purchasers of the bicycle that perhaps it is stolen (when the thief cannot produce the key),
- and deter theft because of #3.
Locking skewers provide a completely separate vector of theft deterrence than just anther external lock. Once a thief has defeated both of your U locks, which he can do if he can defeat one, there is no clue that the bike was stolen. With locking skewers, when the thief attempts to sell the bike, he will be asked for the key. A bike with locking skewers is harder to sell than one without. A bike that is harder to sell is one less likely to be stolen. Assuming a thief does steal the bike and the buyer fails to notice the locking skewers during the sale, they will eventually understand that there was something "off" about the deal they got when they learn they don't have the key. Hopefully this will inspire them to seek out the original owner (you) and return the bike.