Good device which looks like it would be difficult to overcome.

Ordered this to replace my 11 year old Squire padlock which I also bought from Pragmasis. Great lock which is probably easier to use than the padlock and there is a cover to protect the keyhole. As ever, very good and knowledgeable customer service from Pragmasis and I had several email/phone conversations prior to purchase.

Is hefty and looks very well machined, hope to never have it tested by Mr. Bikethief.

2 very minor improvements could be made to an otherwise excellent product.
A small nylon pouch and a slightly more rubberised lock cover, but that's being really picky.

Having read the review from Bikesocial for this little lock I had to have one.
I wasn’t disappointed, it’s like a small work of art and looks totally indestructible, it’s basically solid metal!
Also it fits both my 16mm Squire chain and my 13mm Abus too so can serve double duty when out and about, can even be used as a disc lock if I cannot be bothered to take the smaller chain with me.
If the thieves bring a grinder then the chain gets cut, no way to attack this gem of a lock.
Highly recommended, get 2, one for the mantelpiece!
Mark.

I wouldn't normally buy chains/locks manufactured in China.
Some of the stuff is ok for opportunist thieves, but any thieves going out 'tooled up' to steal your bikes, its all too easy.
The Roundlock has now made that a lot harder !

I would imagine Pragmasis have done their own tests on the Roundlock before they decided to sell them ?

thats good enough for me !......

This lock is a 'work of art',and is perfect to use with my Pragmasis chains.
Unique shape,solid feel and good price, I can't think of any way of attacking this lock, except with a very big hammer !!

As usual....Good service, quality stuff, and fast delivery.

Thanks Pragmasis.
[Pragmasis Comment: Yes, we have done quite a lot of testing, and "Made in Taiwan" is not the same as "Made in China", at least not where these locks are concerned :-) Sold Secure have also done extensive testing on these locks, and hence the high level of approval they have.]

Great customer service, absolutely solid lock, also a good idea that the lock can be used on its own as a disc lock.

I spoke to David from customer service very helpful and knowledgable about the products

After recently purchasing my Roundlock,I decided to 'upgrade' part of my permanent garage security by using my 19mm chain (instead of my 16mm).

I phoned David (at Pagmasis)to order the RL21A replacement socket on Wednesday and it was delivered on Friday am, and I fitted it into my new security layout Friday pm !.....How's that for service ???

As usual...nothing too much trouble,quality company......GREAT !

I have a couple of these - one for a 16mm chain and another for an 19mm chain. They haven't been tested in an attack yet (hopefully never will be), but they seem like they'd resist better than a Squire SS65 (I've seen those cut). The tolerance is tight when locking a chain, and I'm on my second set of plastic dust caps (they get a little brittle in the cold and snap - but I was sent replacements quickly and for free), but I'd happily buy again.

I selected this lock based on its effective performance under attack testing combined with its relatively compact size and light weight. It is also good value! The way it engages with only a single chain link to leave its shackle pretty much hidden underlines an excellent design.

I've been using a Roundlock padlock with a 16 mm chain for a short while now, including through winter, and haven't had a problem with it so much so that I decided to buy another one to use as a disc lock.

Lets be clear, however, that a disc lock is essentially a visual deterrent and that, amongst many other things, a thief could simply lift the front end, and thus the bike, into a van if it was parked using only a disc lock and therefore I'd always say use a disc lock and a chain.

And so, as a disc lock, this is set aside from its competitors simply because of its nimbleness and unique design. As opposed to an open shackle vulnerable to all kinds of possible techniques sold from high street bike stores this has the ability to be fitted in reverse so that the lock faces away from the outside of the bike and thus a little harder to attack. Not impossible to remove, mind. Lets not forget that a disc lock on the rear brake or sprocket is more effective than on the front of the bike, albeit slightly weird if you've never heard or done it before.

I've given it four stars because the plastic lid broke of my first one after a while and I won't hold out hope that this one will last any longer. Also four stars because the "keyed alike" option is only available in any one given purchase and instead a database with recorded codes specific to any given key would be preferable and far easier to spread cost over a period of time as not everyone can afford two locks, that they might eventually need, in one go. Also now have two chunky black keys to carry around rather than one, annoying slightly.

Happy purchase and the likes of Pragmasis continue to offer security and decent prices that far outweigh their high street competitors (if you can call them that).

As always continued updates from Pragmasis staff via email as to progress of order in a very efficient time period, much appreciated.
{Pragmasis Comment: Unfortunately it's not a case of recording key numbers in a database. The factory can only make batches of locks, and all with about a 6-month lead time, so doing retrospective Keyed-Alike is not viable, I'm afraid. If the locks were assembled individually, by us, the price would probably be a lot higher. Batch production obviously makes it a lot more efficient, but this is the downside. We did raise the concern with the factory about the plastic caps being brittle, occasionally (2 reports in over 500 sold, if I am remembering correctly). The material spec has not been changed but it was a different production batch. Hence, something we will monitor. Apologies for the inconvenience. We have spare caps available, should they be required.]

Got this to use as a disc lock on my triumph rocket 3 and frankly I don’t think a thief would know where to start trying to remove it.
It’s the only lock that will fit under the seat so it gets carried and used everywhere.
I use only pragmasis chains and products for my motorbike and mountain bike security - nothing else comes close.
Excellent kit.

In search of an excellent high safety system for securing my bike I found Pragmasis. I am very lucky because it seems there is nothing comparable in whole Austria.
The double doofer ground anchor together with the massive 19mm protector chain and the SS65CS-XLN padlock is a really highest-level protection system. And I think as long as there are so many other bikes less or not additional secured at all, the thieves will choose those bikes instead of mine.
The ground anchor came perfectly packed together with the entire fixing kit. After I fixed it to the concrete floor, I pulled one end of the heavy 19mm chain through. Then I put a SFB RoundLock RL21A through this end link, to make it impossible to pull it back. The RoundLock together combined with the 19mm chain end link is too big to pass the double doofer anchor. Therefore, I have the whole length of the chain available, and don’t need the chain in double length (the chain is really heavy!). On the other end I use the Anti-Pinch Pin together with the SS65CS-XLN padlock to lock the bike.
PERFECT SOLUTION, thanks to Pragmasis for the ideas, the implementation and the highest quality!
Customer service by David Briggs is excellent and very friendly!
Absolutely recommended company!
Best regards, Wolfgang, Vienna

Bought it due to all the positive "theft attack" reviews which it has. Received it yesterday and it seems really solid and well made. Works perfectly. Hopefully it´ll last me for long. Recommend 100%.

Great Quality,i bought RL21 plus RL21A.
Very happy.Thank you

After a theft of high end bikes from my garage, I researched on the internet and came across this company, the range of products is excellent, a one stop shop for bicycle security. First class products and first class customer service . The round lock is a brilliant invention. Highly recommendable

Great service and item fits my chains perfectly highly recommend the company

Very happy with my roundlock + 13 mm chain combination. Looped around a lamp post and combined with disc lock(s) this is way more protection than most motors have in my city. David gave great advice and was very helpful before and during ordering. Thanks!

Bought to fit another brand of 16mm chain (it does) to remove the weak-link padlock I had. Ace!

This is a lovely lock.
Small in size, but not in security as the shackle is thick and out of the reach of the thief.
Excellent design and build quality.
Well done chaps.

Ground anchor, a 2 Metre x 16mm chain and PIN lock.
I have searched the web (eBay, utube, Google, etc.) and I could not find anything better (or equivalent) for cheaper!!
OTHER 16mm chains profess to be “uncroppable” but there are posts and videos that prove otherwise.
I only ever want to buy this kit once, and I hope it is never actually needed. The cost is cheap when compared to a loss of a valuable item, the damage caused, the trauma of the violation and the peace of mind of a purchase that will offset this risk.
I am really looking forward to your kit arriving (in a very nerdy way!)
Thank you so much for your help, technical advice and enthusiastic attitude.
signed - Ex-metallurgy & heat treatment in aerospace.Industry.

Brought these from some of the videos and reviews, can’t fault them as padlocks , unfortunately they don’t work on my GS as disk locks. But they are a very good quality product.buying the chain now to suit...

Excellent product. Bought 2 of these, one for my Protector chain but the other as a disc lock. Paid the £4 to ensure both use the same key. Very easy to fit/use, small and compact. Great service from David and the team

Purchased one of these locks to go with my 16mm chain which is transported on my scooter so size and weight is really important.
Although small and light this lock is really well made, fits the chain perfectly and I think is probably more secure than a traditional style padlock.
So impressed I bought another one!

A good quality lock, which is easy to transport on a bike as a disc lock.

I now have two of these, one of which is used with the Pragmasis 16mm chain (also excellent). It's really a nicely designed and engineered bit of kit with its lovely chrome finish and compact dimensions.
Ordering and delivery from securityforbikes.com was hassle free and very fast. Very satisfied all round.

On one hand, i never want a thief trying to steal my bike. On the other hand, i would love to see a confused thief eyeing up this lock.

Great lock at a great price.
Service also great - Ordered and delivered within 48hrs.
Would definitely recommend this company.

I want to secure my bike when out and about so will pair this with the excellent protector noose chain. This is an extremely well thought out product which should keep my property safe and is lighter than the Squire CS 65 I use at home

1. Excellent service and communications by Pragmasis.

2. The Roundlock is finely machined and feels good to the hands.

3. The Roundlock, both regular socket and RL21A socket versions, while great to use in practice while sitting on the couch or at your desk, it becomes a bit more difficult when trying to get the Rounlock off your motorcycle's disk, particularly, in the rain and with gloves on isn't nearly as easy, as for example, unlocking a D lock.

The problem stems from being unable to tell which direction the keyhole is facing when you are inserting the key at an angle from your body, as the lip of the lock obscures the hole from view, especially when trying to make unlock the lock in an unwieldy position such as on your motorcycle's disk. So you end up having to do a LOT of key jiggling, or ending up kneeling down to get a good look, which is not nice in the mud or the rain. Plus, by design, the Roundlock is supposed to spin to make it harder for thieves to attack it, but this also means that if you try to twist the key prematurely, the lock spins. I think I will use the Roundlock mainly for locking it to a chain, after pulling the end link of the chain through another link in the chain, and not as a disklock, to ensure I'm not having to bend down and be in such an awkward position to use the Roundlock.

3. The keys' blade areas are good quality and precisely machined, they do not feel sloppy/catchy.

4. The keys' black plastic handle areas are a bit large, I feel, and have unnecessary corners. Please compare and contrast to the plastic handles of the spare keys (not the main key, the Kryptonite's main key's handle is huge and ungainly with a completely pointless light on it) you get with the premium range of Kryptonite D Locks (not their budget range), which are oval, smaller and fit better into pockets.

5. Keyed alike is extremely useful, so I now need to carry 1 key with me instead of 4 or 5.

[Pragmasis Comment: I am sorry you are finding the RoundLock can be awkward to get the key inserted when you are using it as a disclock and are unable to get to a position where you can see what you are doing. Many 'disc detainer' cylinder locks, such as our RoundLock, have the same issue about it being important o get the key fully inserted before you start turning the key, which is why we mention it in our videos, but when you can't see if you've got the key in line with the front of the keyway, could make it more difficult with all similar locks, I suppose. As you said, this is rather by design, as the rotating aspect is important in terms of increasing the resistance to attack by thieves.
Nobody has ever said they find the head of the key too large! We will look at the spare keys you mention on Kryptonite's top-end products, as you suggest, but the fact that their 'main key' is even larger suggests they don't think the size of the key is too much of an issue. Interesting, though, and something we will keep in mind. Others may be concerned if we made the key smaller as it may become difficult to operate when wearing gloves. It can be difficult, as different people have different situations and different priorities. Anything like this has to be a compromise across as many different scenarios as we can cover, but this is all useful feedback for us. Thanks again.]

I dont find any probem using my roundlock at all.....have you tried taking off your gloves?