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RoundLock Padlock

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RoundLock Padlock

Discounts Apply !
  •    Info
  •    Tech
  •    Video
  •     Reviews

Our custom-made SecurityForBikes RL21 RoundLock super-compact padlock. Sold Secure Motorcycle Gold/Quad & ATV Gold/Bicycle Gold/Motor Scooter Gold approved with any appropriately-approved chain and also on its own (e.g. as a disc lock).

The RoundLock is lighter and a lot more compact than the Squire SS65CS whilst offering similar security at a much cheaper price. Note that this is a 2-part lock where the top section comes out completely and is then re-inserted sideways through the chain and into the female lock receiver. It may be slightly harder to use than the SS65CS as a result (although you typically need 2 hands to fit that lock to a chain as well).

Disc detainer anti-pick cylinder with 9 discs, protected by rotating anti-drill hardened alloy steel plate.

3 keys supplied.

Keyed-alike available at initial order only (not available retrospectively) when ordering more than one lock together, and only amongst other RL21 locks and/or DIB-Series D-Locks. These locks can't be keyed-alike with any of the Squire locks. Please note that the Keyed Alike option must be selected for *all* locks in the set that you wish to be Keyed Alike.

Very compact and a perfect partner for Protector 16mm chains at a great price! 

Not suitable for our 19mm chain unless the optional extra RL21A socket is also purchased and that is used in place of the standard RL21 socket. The RL21A socket is available separately to adapt this lock to fit our Protector 19mm chains - Please Click for the RL21A Socket product listing.

The RL21 can sometimes be used with our Protector 13mm chains - it's a close fit and the manufacturing tolerance on the chains can make-or-break the idea of the combination. Check to see if we have the corresponding Package Deal available - if it shows as available to order then we have a batch of chain that fits the RoundLock!

This lock can also sometimes be used as a motorcycle disc lock - Check that you have a suitable opening that will take the 21mm diameter shackle in your brake disc or disc carrier and that there is clearance behind the disc for the lock to sit. Sometimes spokes or the wheel hub are too close for the lock to fit in the gap. When it fits your disc, you can then use this with a chain when at home and as a disc lock when out and about.

The RoundLock is generally not suitable for 11mm (or, sometimes, 13mm) chains nor for use with hasps, padbars, etc.

The lock body is 40mm diameter and in the locked position it measures approximately 77mm long overall. That excludes the the plastic cap at approximately 6mm thick.

21mm diameter shackle.

Weight: 0.55kg

Click for more technical information on the RoundLock.

Below is a short video overview of the SFB RoundLock, showing how it can be used with our Protector 16mm and 13mm chains and, with the optional RL21A socket, with the 19mm chains:

87 Product Reviews - Average rating 4.9 / 5 (Click here to expand and to show more reviews)
Clever design, nice and compact.
- 16/09/2022
Having had a squire lock that got stuck and required cutting off I was disturbed as to how easy it was (with an angle grinder). So in the market for a new lock, got one of these. Really clever design, no parts can be got to that won't spin if you try to gread more
Awesome keyed alike security
- 10/08/2022
I bought a pair of keyed alike RoundLocks, one to go with a 16mm Protector chain (which is used when the motorbike is away from home) and one to go with a 19mm Protector chain (used with the brilliant Torc Mega Ground Anchor). The RoundLocks are absolutelread more
- 03/08/2022
Bought a roundlock to use either a disc or chain lock. Seems robust and easily carried around. Clever design.

Excellent communication and customer service from Pragmasis and very quick delivery. Will look to them first to buy other security products.
Great Service
- 19/07/2022
Ordered 2 keyed alike locks which arrived when they were scheduled to, and very quickly.
Not going to attack them to see how they stand up to an assault, but they seem to be substantial enough to do the job, yet small enough to be carried easily.
Would read more
RoundLock Padlock
- 06/07/2022
Ordered two of these. One for my Triumph and one for my brothers HD Sportster. The roundlock was suitable to use as disc lock on the Sportster but not for my Triumph which has spiked wheels. Not an issue really as it is much better than my current padlockread more
Price (inc VAT): £44.95


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