Zovii ZD15S Heavy Alarm Disc Lock review
By John Milbank
Consumer Editor of Bennetts BikeSocial
10.01.2025
Date reviewed: January 2025 | Tested by: John Milbank | RRP: £49.99 | Weight: 772g | www.sportsbikeshop.co.uk
The Zovii ZD15S on review here is the brand’s top-end alarmed disc lock, and while a good security device, it could be more than you need…
Pros & Cons
Very resistant to direct attack
Alarm means less chance of riding off with it fitted
Same vulnerability as most disc locks
Zovii has a potentially better-value option
Size and weight
Sold exclusively in the UK by Sportsbikeshop, the Zovii ZD15S had a stainless steel body and 13.74mm diameter carbide-reinforced locking pin, making for a total weight of 772g.
The alarm’s powered by a supplied CR2 battery (spares cost as little as £1.59 from Battery Station), and arms with a single beep as you press the barrel down. Movement will set off five loud chirps before the siren sounds, and to disarm, just open the lock then press the barrel down again, when it’ll beep twice. At 120dB it’s loud enough to be painful in an enclosed space, or to draw attention when outdoors. And to remind you not to ride off with it fitted!
Three keys are supplied, and like the other Zovii locks I’ve tested of 10mm and above, the pin secures into the base as well as the top of the body, making for much greater resistance to attack.
I left the ZD15S outside in rain and freezing temperatures for a month over Christmas and into the new year, also occasionally hosing it, and I’m pleased to report that the alarm module continues to work perfectly.
Resistance to attack: lock picking
While some YouTube channels might make lock picking look easy, especially when selling the creator’s own tools, it’s not a method used in typical motorcycle thefts at all. The most likely method that thieves will use to defeat a quality disc lock like the Zovii ZD15S is to cut it or the brake disc with an angle-grinder, or lift the bike into a van.
To see how this compares with the other locks we’ve tested, check out our best motorcycle locks for home and away.
Resistance to attack: drill
Despite trying with two different drill bits, the Zovii ZD15S proved unbeatable with a drill thanks to the hardened steel, free-spinning cover plate in the keyway.
To see how this compares with the other locks we’ve tested, check out our best motorcycle locks for home and away.
Resistance to attack: hammer
Repeatedly whacking the Zovii ZD15S with a lump hammer resulted in nothing more than cosmetic damage to the body, though unfortunately the alarm did stop working almost immediately.
Using prying techniques didn’t cause any damage, partly thanks to the thick, stainless steel construction, and also the double-locking pin.
To see how this compares with the other locks we’ve tested, check out our best motorcycle locks for home and away.
Resistance to attack: angle-grinder
Using a good-quality thin cutting disc and well-maintained, high-performance angle-grinder I was able to cut through the body of the Zovii ZV15S. However, it was relatively time-consuming, and certainly took longer than it would to simply cut the brake disc itself, which is a potential theft method that is used at times.
This device took the longest to cut of any of the Zovii disc locks I’ve tested to date, but the vulnerability of the brake disc itself means an ‘Average’ rating is still awarded.
To see how this compares with the other locks we’ve tested, check out our best motorcycle locks for home and away.
Product: Zovii ZV15S
Weight as tested: 772g
Drill attack: PASS
Sledge hammer attack: PASS
Angle grinder attack: AVERAGE
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Zovii ZV15S review: Verdict
The Zovii ZV15S proved to be the most resistant to direct attack of any of the Zovii disc locks I’ve tested, so besides the usual vulnerability of this type of device, it’s a great option for when you’re out and about, or as an additional layer to your security.
It’s a shame the alarm stopped working in the hammer test, but ultimately – despite the ZD15S being a solid piece of kit – the small difference in the angle-grinder attack time compared to the Zovii ZD10S means I’d recommend saving yourself £5 (and 50g).
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