Best motorcycle disc lock

The best disc locks that are a useful – and handy – addition to your security arsenal

Xena XX15 disc lock fitted to motorcycle

by Jim Blackstock |

As we know, keeping your bike safe and secure is all about layers of security. And one of those layers that is easy to use and offer great protection is a motorcycle disc lock.

These are super-easy to transport and use, locking through one (usually the front, for better access) brake discs and preventing the wheel from turning. This is useful because, although in itself it won’t prevent the bike from being physically lifted up and put in the back of a van, it will mean it can’t be ridden away.

Related: Top motorcycle paddock stands

Opportunist thieves may not be able to get your engine running, but if your bike is only protected by its built-in steering lock, that’s easy to get around and then, one can sit on your bike while another pushes it from a moped or similar. With a disc lock in place, they can’t do that and will hopefully move on to the next, unprotected, bike.

While a motorcycle disc lock is not something that you would rely on in isolation – for example, protecting your bike for long periods – it’s definitely a useful addition if you’re popping into the shops or leaving the bike for an hour or two while you go exploring.

What features should a motorcycle disc lock have?

In addition to physically locking your bike and preventing it from being ridden, disc locks can also have additional features built-in, such as Bluetooth location services and high-intensity alarms, to draw attention to themselves if someone is tampering with the bike.

Related: Top security products to keep your motorcycle safe

Many will also come with a safety lanyard to remind you to remove it before you ride off – you would be surprised by how many people forget it’s there and get a rude awakening after just a few millimetres of their journey.

Like any security product, look for Sold Secure approval; this not-for-profit testing house is run by the Master Locksmiths Association and rates products by their attack resistance. Look for Motorcycle-rated products with Gold or Diamond being the second-highest and highest standards, respectively.

Here is a selection of motorcycle disc locks that should help you keep your bike safe and sound.

REAPP Alarm Disc Lock

REAPP Alarm Disc Lock
Amazon

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This diminutive disc lock is Amazon's bestseller and at less than £25, it's easy to see why. It's small, packs a 110dB movement alarm to alert passers-by of tampering and will fit brake discs up to 7mm thick. If you're low on funds this is a great way to add a first layer of defence and ward off casual or opportunist bike thieves.

The lock pin is also 7mm in diameter and the locking mechanism is built into the thicker side of the U-shaped metal portion. It also comes with a handy reminder coiled cable to prevent you from riding off with it in place.

Features:

Very cheap

7mm locking pin

110dB alarm

Zovii ZD10 alarmed disc lock
Tested by Gareth Evans for four months

Zovii ZD10 alarmed disc lock

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I think we can all agree that peace of mind is important when leaving your bike in an unfamiliar place overnight. That’s what this little ensemble has given me – I’m fully confident that not only will the alarm activate when either grip or disc lock is tampered with, but when it does it’ll be LOUD. The reason I know about the loudness is because when installing the batteries before using it, the locks emit a single 120dB beep that was so unexpectedly noisy I nearly fell off my chair.

The ZD10 alarmed disc lock has a reassuring heft to it, yet it’s compact enough to fit into the pocket of my textiles without feeling too bulky. It has features like a carbide locking pin and full weatherproofing including against ice spray attacks, but one thing I really found neat was the way the battery installation works: I’ve criticised rival locks in the past for this, as quite often it’s a fiddly, irritating process, but here it’s simple – undo the grub screw (which isn’t accessible when on a disc, crucially) and the electrical assembly drops, allowing you to easily install it.

I’m a big fan of the bright colour, too. I’d far rather a thief was put off trying to steal my bike at a distance than getting up close before noticing the lock.

Oxford Monster Disc Lock

Oxford Monster disclock
Amazon

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A variation on a theme, this long-shackle lock from Oxford can also be used with a chain to secure the bike to a fixed object. With no chain, it can easily fit one of the bike's brake discs and uses an 11mm hardened steel U-shaped shackle in a protected case, locking at both ends.

It comes with three keys, but replacements are available, and it has been awarded a Sold Secure Motorcycle Gold standard for strength, as well as Thatcham approval and Secured by Design.

Features:

Thatcham approved and Secured by Design

11mm shackle

Can be used as a padlock

Oxford Quartz XA10 disc lock

MCN Rated
Oxford Quartz XA10 disc lock
Amazon

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Tested by Gareth Evans over 1500 miles. Quality 4. Value 2.

“This reassuringly heavy little lock has been a grand companion. It fits in my jacket pocket, making it super-practical for trips when I’m without luggage.

“I love its simplicity – all you need to do is push the key down and the lock barrel sinks into the casing. Rotate key and the alarm beeps loudly to let you know the 10mm pin is armed, which is mostly useful and occasionally irritating at night. I’ve set the alarm itself off for testing, and that thoroughly unpleasant experience highlighted this is one LOUD alarm.

“Biggest drawback? The battery is extremely difficult to access, it’s not ‘Sold Secure’ and it’s not cheap.”

Oxford Alpha XA14 Alarmed Disc Lock

Oxford Alpha XA14 Alarmed Disc Lock
Amazon

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Some disc locks are now so heavy and chunky that they're getting hard to carry around, but this Sold Secure Motorcycle Gold standard XA14 is superbly compact and portable, while delivering top-notch physical protection, and an uncomfortably loud 110dB siren if someone tries to tamper with it.

The locking pin is 14mm, and the compact dimensions mean it’s easy to slide into place even if you’re riding a sportsbike with limited clearance between brake discs and wheel rim. It can also be fully locked in place with the alarm disabled, if desired. The battery is rechargeable, via a supplied USB lead, too.

Features:

110dB alarm

Sold Secure Gold

Compact and portable

14mm locking pin

Milenco Composite Disc Lock

Milenco Composite Disc Lock
Amazon

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Milenco are a real force to be reckoned with, and their Composite is a great option if you're looking for a highly visible and secure disc lock. In line with all the top strata of disc locks, it's Sold Secure Motorcycle Gold standard in terms of thief-repelling resistance.

The hardened steel locking pin is 60mm x 14mm and locks into an integrated steel disc on the inside edge of the unit. The ‘composite’ part of the name refers to its material construction – and not being a solid lump of steel means that this defender is significantly lighter than similar Gold standard rivals.

Features:

Sold Secure Gold

Solid steel construction

14mm locking pin

Abus Detecto XPlus

Best heavyweight disclock
Abus Detecto XPlus
Amazon

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Abus have long been at the forefront of bike security, and this 8008 is a serious unit that also features a 100dB alarm to deter anyone who's not deaf from tampering with it. If someone does, or knocks it by mistake, the alarm will sound for 15 seconds, then re-arm itself again.

The body is all steel construction for serious resistance, while the locking pin is a very chunky 16mm. Once you’ve pushed the pin through and locked it in place, rotating the black plastic key shroud slides a cover over the locking hole to help keep dirt and moisture at bay. It knows if it’s on a disc or not, so won’t alarm itself during transport.

Features:

100dB alarm

All steel construction

16mm locking pin

Xena XX15 Bluetooth Alarmed Disc Lock

Xena XX15 Bluetooth Alarmed Disc Lock
Amazon

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'You talkin' to me, well are ya?' Er, yes. Security has come a long way, and there are now numerous Bluetooth and WiFi-enabled locks. This XX15 is one of them. It boasts tough-as-hell full steel construction and a 120dB alarm, 14mm carbide reinforced locking pin, and is corrosion and ice-spray resistant. Connect to the app and you can change your alarm settings and monitor the battery health.

Features:

120dB alarm

Bluetooth connectivity

14mm locking pin

Oxford Patriot Disc Lock

Oxford Patriot
Amazon

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The Patriot from Oxford is a compact unit, using a mushroom-shaped hardened steel pin that goes through the brake disc and locks into a secure body. Two pin lengths are available, allowing the lock to be used with a chain, and the short-pin version comes with a bracket to mount it to the bike for ease of use. It has been rated as Sold Secure Motorcycle Gold and it's SBD approved, as well.

Features:

Thatcham approved

Can be used as a padlock with longer pin

14mm locking pin

Comes with a bracket to carry on your bike

Gear Gremlin Delta Disc Lock

Gear Gremlin Delta
Amazon

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A tiny lock using a 5mm locking pin, designed to be as easy to use as possible. It sits against the outside edge of the brake disc and the locking pin goes through one of the cooling holes to prevent it from turning. It's a simple push-to-lock system and comes with two keys and a reminder cable.

Features:

Small and compact

5mm locking pin

Very cheap

Mammoth U-lock Disc Lock

Mammoth U-lock
Amazon

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Essentially a U-shaped padlock with a plastic-coated shackle to prevent damaging the bike's brake disc, this lock from Mammoth is simplicity itself. It can secure around any section of the disc that is accessible and features a 13mm diameter shackle and a hardened steel body. It comes with a reminder cable and can also be used to secure the bike to a fixed object with a chain.

Features:

13mm shackle

Can be used as a padlock

Thatcham approved

Abus Granit Victory Disc Lock

Recommended
Abus Granit Victory
Amazon

View offer

Another through-the-disc lock, this one from Abus has a low-profile head for bikes with tight clearance between spokes. The brake disc and the 14mm diameter steel bolt goes through the disc and locks into the hardened-steel body. Like other Abus locks, it can also be ordered keyed-alike and can be used with chain combinations to secure the bike to a solid object.

Features:

14mm steel bolt

Handy LED torch in key

Thatcham approved

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