|
Hardened steel U- or D-locks, like Kryptonite and derivatives, take less than a minute to cut with an angle grinder. These days, every major tool manufacturer sells a cordless angle grinder.
You can also break them apart with a generic scissor jack from a car, although that might take 3-5 minutes if you're being ginger about it.
That said, I rely on a kryptonite U-lock. All the bikes I've had stolen were someone taking advantage of my laziness. If it's going to be somewhere overnight, take the front wheel off and be sure you're locking both wheels + the frame. Otherwise, lock the frame + a wheel. Never ever ever lock just a wheel, unless you're at the neighborhood coffeeshop and you might be able to get away with locking the back wheel through the frame, since it's unridable and anyway you're sitting right there.
Probably the most effective lock is one of a size that you'll actually carry and use.
|