Rider RR55 disc lock-review| Mini shackle lock destruction tested
By John Milbank
Consumer Editor of Bennetts BikeSocial
19.12.2025
Date reviewed: December 2025 | Tested by: John Milbank | Price: £49.99 (RRP) | Weight: 623g | riderr.co.uk
The Riderr RR55 disc-lock on review here is a simple shackle design that can be used as a motorcycle disc lock or as a basic padlock for a chain.
Two keys are supplied and a sliding plastic cover helps protect the keyway from dirt and dust.
Our independent destruction testing showed that while this lock doesn’t offer the highest levels of protection, it’s a relatively versatile design that can help protect your motorcycle, especially when combined with a chain…
Pros & Cons
Can be used as a disc-lock or padlock
Allows tethering of the bike
Disc-locks have specific vulnerabilities
Shackle is relatively vulnerable
Size and weight
Weighing 623g, the Riderr RR55 is well protected against damaging your bike’s paintwork thanks to a plastic casing over the main body and soft cover over the shackle.
When closed, the maximum space inside the shackle is 39.5mm x 59.5mm, which makes it easily fit over the front brake discs of my 2019 BMW R1250GS, 1999 Kawasaki ZX-6R and 2001 Honda VFR800. Due to the lack of gaps in many scooter and smaller motorcycle brake discs like the Honda MSX125 (Grom), it may not be suitable for them.
You could lock the end of a noose chain into the shackle while it’s attached to the brake disc, or even both ends of a normal chain, which gives added security as even if the chain is cut, the lock still needs to be removed to push the bike away.
Equally, this Riderr could be used as a padlock with a chain that’s looped around the rear wheel.
The shackle is 14.7mm in diameter over the areas exposed outside of the main body, and with the protective sleeve on it’s 17.2mm, so do check the space inside your chain’s links if pairing the two – I found it fine with a 13mm Pragmasis long-link chain, but too large for an unbranded one I had to hand.
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: bolt-croppers
The size of the Riderr RR55’s shackle makes a bolt cropper attack unviable even with the 48 inch croppers I use for testing.
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 hard steel plates in the Riderr RR99’s keyway stood up to my drill-bit very well. This is an unlikely attack, but it’s good to see that even relatively budget locks can resist it well.
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 Riderr RR55 isn’t susceptible to a typical disc-lock pry attack using a claw hammer or pry bar.
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
Attacking the Riderr RR55 with a lump hammer did nothing more than smash the outer casing off – it stood up well and can’t be removed from a brake disc with this brute-force method.
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
While the hardened steel shackle of the Riderr RR55 is fairly thick, it can be cut just once to leave a wide enough opening to get it off the brake disc (though it takes some jiggling). This puts it at a disadvantage compared to many other disc-locks, though the shackle is retained well enough that if acting as a padlock it would require two cuts to release the chain.
As with all disc locks, the risk is that a thief might cut the disc itself, but the length of the shackle means it can be tucked into the disc carrier’s holes, making it harder to defeat this way. This isn’t a technique used in all cases as the disc can warp and jam against the caliper to prevent a push-away, and the thief might not want to damage the disc, depending on the intended use for the stolen bike. However, the relatively low resistance to an angle-grinder attack does put this lock at something of a disadvantage.
To see how this compares with the other locks we’ve tested, check out our best motorcycle locks for home and away.
Product: Riderr RR55 disc-lock
Weight as tested: 623g
Bolt cropper attack: PASS
Drill attack: PASS
Prying/splitting attack: PASS
Lump hammer attack: PASS
Angle grinder attack: POOR
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 RR55 disc-lock review: Verdict
The Riderr RR55’s almost 15mm-thick shackle sounds impressive but keep in mind that high security padlocks like the Squire SS65CS and SS80CS have a closed-shackle design that makes them very hard to attack when attached to a chain, so I wouldn’t consider this is a good solution for home-security with heavy-duty chains.
As a disc-lock or a portable padlock it’s okay, but there are tougher options at this price. I’d always recommend investing in the best possible security you can afford, using it, then just getting on with enjoying motorcycling.
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