Stops the wheel turning, and nothing else · review
KRASER KR7Y review
A disc lock with a 110 dB alarm on a rechargeable battery charged by USB-C, a ø7 mm pin, keyless push-cylinder locking and a three-second arming delay.
The bottom line A rechargeable alarm with a published warning sequence and a reminder cable. No independent security rating, where two of its neighbours have one.
What the seller commits to paper
A 110 dB alarm on a rechargeable battery with a USB-C cable supplied. A ø7 mm pin stated to suit all types of brake disc. Keyless locking — press the cylinder, alarm active in 3 seconds — and three warning tones when the lock detects an attack before it sounds fully. Automatic dust protection on the cylinder. A reminder cable.
Rechargeable is the right call
An alarmed disc lock running on a coin cell goes quiet without telling you. USB-C charging means the failure is visible and fixable with a cable you already own.
The warning sequence is a real detail
Three tones before the full alarm is what stops a lock screaming every time someone brushes past it in a car park. Publishing the behaviour rather than only the volume says how it will actually behave.
The rows this seller leaves empty
Any independent security rating. Sold Secure and ART are the two that appear elsewhere in this family, and neither is cited here.
Availability
Between 30 € and 35 € across the German, French, Italian and Spanish Amazon stores, in the single reading behind this page.
Priced in local currency, which the euro range above deliberately leaves out, it also appears on the American Amazon store.
An entry with nobody selling against it sits in the British Amazon catalogue.
What Keepa returned in the single reading behind this page. Availability and prices move without notice.
Prices quoted in this text were read on 18 September 2026. The live price is at the top of the page.
The declared figures, and the blanks beside them
Strengths
Rechargeable rather than running on a cell that dies unnoticed
Publishes the warning sequence, not just the alarm volume
Reminder cable supplied
Compromises
No independent security rating published, unlike two locks in this family
A rechargeable lock needs charging — a flat one is a lock without an alarm
ø7 mm / 0.27 in, stated to suit all types of brake disc (maker’s bullet)
Arming
Press the cylinder, alarm active in 3 seconds; 3 warning tones on detecting an attack (maker’s bullet)
Locking
Keyless — press the cylinder; automatic dust protection (maker’s bullet)
Security rating
The maker puts nothing in writing on this — no Sold Secure or ART level is cited.
Amazon reference
B0BWF2YWZN (one reference across 6 Amazon marketplaces)
EAN
8423885810076
What riders ask about this one
What is the reminder cable for?
It runs from the lock to the handlebar so the lock is in your eyeline before you pull away. Riding off with a disc lock fitted damages the disc, the caliper and usually the rider.
Does the alarm replace a rating?
No. An alarm is a deterrent; a security rating describes resistance to attack. Two locks in this same family publish a rating and this one publishes a decibel figure.
Who this one is for
A rider who wants an alarm and does not want to hunt for a coin cell twice a year.
Compared with its closest rivals
Same category, nearest prices. Only the specifications every one of them states are shown — a half-empty column compares nothing.
Model
Price
Amazon reference
KRASER KR7Y
30 €
B0BWF2YWZN (one reference across 6 Amazon marketplaces)
A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.
Details checked on September 18, 2026.
Sources
Specifications: manufacturer sheet and Amazon product page. Prices and availability: Keepa. No product on this site has been physically tested.
110 dB alarm · 7 mm hardened steel bolt · 1.5 m reminder cable · motion sensor
A disc lock with a 110 dB alarm on a motion sensor, a solid 7 mm hardened steel bolt stated resistant to cutting, drilling and rust, and a 1.5 m reminder cable.
Best for: Daily parking where the alarm and the visible lock together are the deterrent.
110 dB vibration alarm · aluminium alloy body · under 7 mm discs · 1.2 m reminder cable
A disc lock with a vibration-triggered 110 dB alarm in a high-strength aluminium alloy body, for discs with holes under 7 mm, supplied with a 1.2 m reminder cord.
Best for: A second lock, or a light one carried on a commute where the alarm does most of the work.