Riderr RR99 disc lock review | Chain-compatible disc lock test

Date reviewed: December 2025 | Tested by: John Milbank | Price: £59.99 (RRP) | Weight: 651g | riderr.co.uk

The Riderr RR99 disc-lock on review here comes with two keys and a storage pouch, though don’t hang it on your belt – carrying any lock on yourself could lead to injury if you fell off.

The RR99 has a sliding cover to protect the keyway and comes in a bright fluorescent yellow colour to help it get spotted… hopefully reminding you to take it off before riding away (adding the £3.99 Riderr Disc-Lock Minder would be a good idea).

A notable feature that surprisingly hasn’t been mentioned on the packaging or website is that this lock can be used with a chain – either acting as a padlock to secure both ends of one, or with a noose-end chain, where the single end link can be passed through the noose around the object you’re anchoring to, then the pin passed through it and the bike’s brake disc. This means that even if the chain is cut, the bike still can’t be pushed away.

Pros & Cons

Size and weight

Weighing 651g, and with a length of 79mm, the Rider RR99 should be fairly easy to tuck under a fair few bikes’ seats, or in the luggage. With the pin fitted it has a height of 100mm, though you could store it with the pin removed, which is 79mm long with a 40mm diameter head. The main body has a diameter of 46mm.

Disc-locks of this style sometimes don’t work with BMW front wheels that don’t have a disc carrier, however due to the length of the RR99’s locking pin it wedged itself in fine between the disc and the hub of my 2019 R1250GS.

The 15.82mm diameter pin doesn’t fit between the disc and carrier of my 2001 Honda VFR800, so needs to go into one of the larger holes in the carrier itself. This is a good option though as it means a thief looking to cut the disc itself would have to cut that AND the carrier, slowing them down further. The pin does fit directly behind the disc on my 1999 Kawasaki ZX-6R, or I can also go in the carrier. Check the design of your bike’s discs – the RR99’s likely to fit most, but it might not work with scooters or bikes like the Honda MSX125 (Grom).

A slight frustration with this lock is that it can be a bit fiddly to put together – especially if fitting it into the disc carrier – as you’ve got to hold both sides at the same time (and the chain too if you’re using one). This can lead to grubby hands as you brush against the disc so it’s best to leave your gloves on (though these will pick up the dirt too).

If you intend to use the Riderr RR99 with a chain, check the internal size of the links to be sure the pin will pass through – I found it works great with a 13mm Pragmasis noose chain. You can find all the motorcycle security chains we’ve reviewed in our library of independent product tests here.

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. Specialist tools are increasingly made available to the public, but it’s in the interest of these creators to portray them as simple to use. The fact is that UK motorcycle thieves are not spending the time and effort on lock picking.

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 RR99 stood up impressively well to a drill attack, the tough steel plates inside the keyway spinning under the bit.

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

Due to the design of the Rider RR99 disc-lock, a prying attack isn’t viable. Typically it’s possible to get a pry bar or claw hammer between the body of the lock and the disc, but I was unable to get anywhere with this device.

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

Despite a very sustained attack with a lump-hammer, the Rider RR99 only suffered cosmetic damage. It was still possible to unlock the device and remove it after its battering.

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

A reciprocating saw attack is very unlikely as an angle-grinder is more versatile, usually quicker and it’s a lot cheaper and easier to get hold of effective blades. There’s no advantage to attacking the thick pin of the RR99 with a reciprocating saw like there is with a typical disc lock, which usually has a smaller, but more shielded 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

The length of the Riderr RR99’s locking pin makes it easier to attack with an angle-grinder, but using a quality 1mm cutting disc it still took longer than it would to cut the disc itself, or even a chain that’s attached to it.

This means that – if fitted to the disc carrier and a chain’s attached – the thief will have a lot more work to do in order to move the bike, making it a far less tempting target than other motorcycles that might be parked nearby.

To see how this compares with the other locks we’ve tested, check out our best motorcycle locks for home and away

Bennetts BikeSocial test results

Product: Riderr RR99 disc-lock

Weight as tested: 651g

Drill attack: PASS

Prying / splitting attack attack: PASS

Lump hammer attack: PASS

Angle grinder attack: PAS

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 RR99 disc-lock review: Verdict

Needless to say, this £60 disc-lock doesn’t offer the same level of protection when securing two ends of a chain as a high-end padlock like the Squire SS65CS or SS80CS, but the fact that it can be used for this does add to its value, and it’s harder to cut than any portable chain. You could loop a chain through the back wheel with the Riderr RR99 linking its ends, or tether the bike from the front disc by attaching the end of a noose chain to it.

The typical weak point of a disc-lock is that it can be defeated by cutting the disc itself. This isn’t the case in every theft attempt, but by fitting the RR99 inside the carrier (if you can), it makes it harder to defeat. The other probkem is that the bike could be picked up and put in a van when secured with a disc-lock, but being able to use this with a chain means you can tether it too.

Riderr would be wise to update their website and packaging to boast about the hidden features of this lock, as it makes it a great value option for securing your motorbike.

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