It's tough, it's alarming, it's reassuring
Disc locks: either you believe in them or you don't. Reformed bike thieves recommend fitting them to the rear disc as it's harder to remove than the front. If a thief wants your bike, they will sacrifice the front wheel to get it, but disc locks aren't always easy to fit to the smaller, rear, disc. Problems, problems. This lock is solid and feels very robust. The inbuilt alarm is loud but occasionally sets in disabled mode, rather than armed. No big deal, just takes a few more seconds to reset, which is easy, as arming occurs when you press the locking pin down with the key. Alarm is powered by a Li-ion battery with three month life. It can then be recharged via any micro-USB charger, using the supplied long allen key to remove the cover plate. Alarm is loud, which ought to be a good thing but, given the sheer brazenness of thieves today, it may be no more than a minor distraction as they load your baby into their van. Consider a disc lock just a part of your protective armour. The lock comes with an attached, not very long, yellow elasticated reminder cord, so you don't need to buy one. My bike doesn't have an alarm so, provided you believe in the usefulness of audible alarms, this one is a handy adjunct.
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