Alarm layer on top of a real lock

- Security
- Smart
ROCKBROS Disc Brake Lock with 110dB Alarm
- Detail
- Disc Brake Alarm Lock
- Detail
- Use: Smart, Secondary
A press-to-lock disc brake lock with a 110dB motion alarm and reminder cable.
How-To
E-bikes are worth more than a regular bike and just as easy to grab off a rack — here's the layered approach that actually keeps one from disappearing.
We cover lock types and correct locking technique in our Best Bike Locks guide — that's still where to start. This post is the layer on top of the lock that's specific to e-bikes: what changes because there's a battery involved, what to add beyond the lock itself, and where the bike lives when you're not riding it.
Alarm layer on top of a real lock

A press-to-lock disc brake lock with a 110dB motion alarm and reminder cable.
Recovery if the lock fails

A working bike bell that hides an Apple AirTag inside, so your bike is trackable through Find My even if a lock fails.
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An e-bike in this site's budget-to-mid-market range still typically costs two to five times what a comparable regular commuter bike does, and it resells fast — used e-bike listings move quickly because demand outpaces supply in a lot of markets. Combine higher value with quick resale and an e-bike is a more attractive target sitting on the same rack as a $300 hybrid, even with an identical lock on both.
The battery adds a second angle entirely: on models with a removable pack, the battery alone is worth real money and is sometimes taken on its own, lock and frame untouched.
This is the one habit that doesn't apply to a regular bike. If your battery is removable, take it with you anytime you're leaving the bike for more than 30–60 minutes. A battery-less e-bike is heavier to carry off and a less attractive target on its own, and you're not risking a standalone battery loss — replacements commonly run $400–$900.
If your pack is locked to the frame instead of removable, that lock is a separate thing to check is actually engaged — it's an easy step to skip on the way out the door.
Our locks guide covers which lock to buy and the two-lock strategy — this is what to add on top of that for a bike worth protecting a bit further. A motion-triggered alarm, like the ROCKBROS Disc Brake Lock with its 110dB alarm, makes cutting a cable or prying a shackle loud and public, which is often enough on its own to send someone looking for an easier target elsewhere.
A hidden tracker is the other piece, and it's a recovery tool, not a deterrent — the ROCKBROS Hidden AirTag Bike Bell conceals an Apple AirTag inside a working bell, so a stolen bike can still be located through Find My even if the lock fails. Neither of these replaces a real lock; they're what closes the gap when a lock alone isn't enough for what the bike is worth.
Well-lit areas with regular foot traffic are meaningfully safer than a quiet side street or alley, even with an identical lock and bike. At home, a garage or covered entryway beats leaving the bike against an outside wall overnight — visibility cuts both ways, and an e-bike in plain view from the street is more of an invitation than the same bike out of sight.
Strip off anything that isn't bolted down before you walk away, too — phone mounts, clip-on lights, and saddle bags are often the first things taken even when the bike itself doesn't get touched.
Two things are worth doing the week you buy the bike, not after something happens. Registering your serial number is free and takes about five minutes — we walk through exactly how in how to register your bike's serial number. And it's worth a five-minute call to your insurer to find out whether your homeowners or renters policy actually covers an e-bike at its full value; we cover what to ask in does insurance cover your e-bike.
Start here — which lock to buy and the two-lock technique this guide builds on.
A free, five-minute step that meaningfully improves the odds of recovering a stolen bike.
What to actually ask your insurer before you assume you're covered.
The full setup checklist this security layer is one piece of.
Every lock guide, comparison, and theft-prevention step we have, in one place.