





Pragmasis Roundlock
Spend £100 to get free shipping in the UK. Orders less than £100 ship for a flat rate of £3.95.
You have 30 days to return or exchange anything you’re unhappy with.
Update, 26th June: Our first batch of Roundlocks was ready for dispatch yesterday. We put them back into stock, but they sold out in a matter of hours. Sorry if you didn't get one. We have a much larger batch in production. Please stay on the list, and you'll get a notification when our next batch is ready.
Our custom-made SecurityForBikes RL21 RoundLock super-compact padlock has been designed to fit our Protector chains. It also doubles as a motorcycle disc-lock.
Independently tested to Sold Secure Motorcycle Gold and Pedal Cycle Diamond standard. It's small but mighty!
The RoundLock has a beefy 21mm pin and a compact body that spins, making it very hard to defeat. It features a disc detainer anti-pick cylinder with 9 discs, protected by a rotating anti-drill hardened alloy steel plate.
It offers almost impenetrable resistance against common attack methods, including grinding, hammering, freezing, and drilling.
We think this lock offers unbeatable bang for your buck!
Highlights
- Sold Secure Motorcycle Gold
- Doubles as a motorcycle disc lock
- 21mm steel shackle
- Weighs 0.55kg
- Supplied with 3 keys
- 10-year guarantee
Chain options
We recommend this padlock with the Protector 13mm and 16mm chains. It will fit the Protector 19mm chain, however, we also sell a RoundLock Adapter which is called the RL21A. This adapter has a chamfered edge and is used instead of the standard-issue head, making it easier to fit the lock to the 19mm chain.

Pragmasis Roundlock
Product specification
0.55kg
21mm
Motorcycle Gold, Pedal Cycle Diamond, Motor Scooter Gold
13mm, 16mm, 19mm (with RL21A adapter)
This thing is so hard to beat that its price seems incredible compared to some of the highest-security locks on the market.