Riderr RD15S review | Alarmed disc lock destruction test
By John Milbank
Consumer Editor of Bennetts BikeSocial
17.12.2025
Date reviewed: December 2025 | Tested by: John Milbank | Price: £109.99 (RRP) | Weight: 767g | riderr.co.uk
The Riderr RD15S on review here is a stainless-steel motorcycle disc lock with a piercing 120db alarm built in. Three keys are supplied with this tough lock that stood up well to our independent and unbiased destruction testing…
Pros & Cons
Very good resistance to attack
Alarm isn’t as sensitive as some
Has the same vulnerabilities as other disc locks
Size and weight
Weighing 767g, this is a solid yet compact device, though as with any lock you shouldn’t carry it in your pocket as it could cause injury in a fall. Measuring 56mm x 60mm x 91mm at its widest points it will easily fit in your bike’s luggage, and might tuck under some seats.
The locking pin measures 13.85mm in diameter and ties into the base of the lock to help prevent prying attacks.
Riderr RD15S alarm
The Riderr’s alarm module is powered by a supplied CR2 lithium battery, which should last a claimed eight to ten months and costs around just £2.75 from Battery Station to replace. Pressing the lock barrel down arms the RD15S with a beep, then six seconds after arming it gives another, longer beep to let you know it’s active.
Opening the lock disables the alarm, and there’s a constant cycle when pressing the barrel down – one beep means arming, two beeps means the alarm is deactivated, so you can then lock it up without being armed.
With the Riderr attached to my VFR800, and having given it a good minute to settle down, I was disappointed with the lack of sensitivity. The Artago disc lock alarm modules have set something of a benchmark, but with this device I can move the bars and pull the bike upright without setting off the alarm as it appears to need more sustained movement before going off. This isn’t always consistent – at times it can pick up movement more readily – but it’s certainly not the best implementation I’ve come across.
Once triggered, the RD15S will first give five short double-beeps as a warning. If there’s any movement after that it will perform a series of loud beeps then start the siren screaming. The instructions claim that this lasts for 75 seconds, but the total full siren time is actually 18 seconds before going back to its armed and ready state.
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 theft method used in typical motorcycle thefts at all.
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
The Riderr RD15S is very hard to attack with a drill thanks to the tough plates in the keyway. My first attempt saw the bit skimming on the top, then switching to a smaller one resulted in it snapping off in the lock.
Of course this would mean it couldn’t be unlocked with the key, but it’s a very unlikely scenario as thieves don’t tend to bother with drills due to the tool’s lack of effectiveness and versatility compared to an angle-grinder.
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: prying & splitting
The combination of the lock barrel being keyed into the base of the Rider RD15S, and the very tough stainless-steel body mean I was unable to get anywhere close to prying it off or splitting it, even with excessively large tools.
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: lump hammer
A sustained attack with a lump-hammer just results in cosmetic damage on the Rider RD15S’ body – it still opened fine, and impressively the alarm continued to scream even after all the hammering (some stop working after a few blows).
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: reciprocating saw
Using a reciprocating saw I was able to cut the Riderr RD15S’ pin once, at which point the lock fell off as the barrel popped open. It’s important to stress that this attack took a significant amount of time and effort, and is also very unlikely (an angle-grinder is far more typical).
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
The most likely form of attack, the Riderr RD15S puts up a good fight but can of course eventually be cut off the disc. Once the body is split it can be rotated to release the locking pin from the base.
This is still a slow process though, and ultimately the vulnerability of almost any disc lock is that the brake disc itself can be cut. This can result in the disc jamming against the caliper though, so it’s not the default attack method by thieves who might also not want to destroy the disc, depending on the intended use after stealing it.
To see how this compares with the other locks we’ve tested, check out our best motorcycle locks for home and away
Product: Riderr RD15S
Weight as tested: 767g
Drill attack: PASS
Lump hammer attack: PASS
Reciprocating saw attack: PASS
Angle grinder attack: PASS
To see the other chains and locks tested by Bennetts BikeSocial, click here and be sure to regularly check for the discounts available through BikeSocial membership.
Riderr RD15S disc lock review: Verdict
Over the past year there’s been increasing competition in the relatively budget end of motorcycle disc locks, which is a challenge for the RD15S. At the time of writing, the Riderr is generally available for £71.99, which makes it a more tempting proposition but still leaves it struggling compared to some of the best motorcycle locks we’ve tested.
The performance of the alarm module was disappointing in my testing, but the resistance to attack is impressive – this certainly isn’t a bad lock, but it’s up against some that offer even better value.
If you’d like to chat about this article or anything else biking related, join us and thousands of other riders at our friendly and helpful BikeClub forum.
