Proper Chain Technique – Hardware store chain doesn’t cut it, I’m talking about purpose build chain with flat links to deflect bolt cutters paired with a heavy duty lock. Basically, include the frame and both wheels, and make sure whatever you’re locking to is big enough to prevent the lock from being manipulated over the top. Some parking meters are susceptible to this. And keep that lock mechanism off the ground, same as a u-lock.

Proper Cable Lock Technique – There is no proper technique of using a cable as a primary lock in any big city. Most can be cut with hardware store bolt-cutters with cheater bars, well within reach of common thieves. Used as a secondary lock, or to secure wheels, a decent cable can be handy.

No matter what, common sense prevails. Never free-lock, don’t leave your bike out overnight or in secluded places. An angle grinder makes quick work of just about anything on the market, and a cordless model is only a couple hundred bucks. If someone really wants your bike, given the opportunity any lock can be defeated.

Techniques to prevent component theft.

Beyond specialized bolts and wrenches, or actual keyed bolts, there are some DIY methods to deter component theft.

Saddle – Run a continuous loop of bicycle chain through the seatstays and saddle rails. Cover it with an old tube to quell the rattling.

Stem, bars, fork – Anything that is attached with an allen bolt can be secured with a dab of hot glue or wax and a ball bearing in the bolt head. It can be dug out with an awl, but otherwise prevents a wrench from fitting.

Wheels – Bolt-on hubs are enough deterrent for some areas. Keyed skewers also exist. Just run a cable through ‘em and call it a day.