I have the 190mm x 87mm lock and have been using it, every day, for just over a month. The quality of this lock is obvious. I can't recommend this lock enough.

Awesome product and service guys thank you so much. I bought two of these and use them every day in Central London. Solid quality feeling lock.

I have the larger d-lock. Works well so far and a good price.

I bought the 190mm DIB lock as a mobile security solution. It feels sturdy and the rubber on the shackle is thick enough to protect paint work on the wheels. Lock operates smoothly. Definitely worth the money.

As the owner of a specialist electric bicycle costing as much as many motorcycles and more awkward to lock than many bicycles, I purchased both sizes of DIB D-lock along with a 1.5m noose end 13mm Protector chain and RoundLock package, all keyed alike. Customer service was excellent, I received the products quickly and was kept informed during the process.

After a couple of weeks of regular use, I'm getting on well with the locks and chain. I'm very impressed with how sturdy and well-made they feel and I especially like quality features like the DIB sliding keyhole covers.

Together they definitely make up for only having bottom-of-one-wheel stands available as locking points in my building's communal cycle garage.

If I had access to standard Sheffield stand bike parking with multiple locking points at home, the chain would be unnecessary - the DIB D-locks have a higher Sold Secure rating than any chain with a low enough weight to not risk bending bicycle spokes.

My static security strategy uses the larger DIB to lock the rear wheel and one chainstay to the wheel stand, secures the noose end of the Protector chain to the same stand and then pulls that through the smaller DIB D-Lock and the front wheel, locking that D-lock to the frame and through the last link in the chain, forming a tight 'figure 8' around the front wheel.

Having keyed-alike locks makes the whole process of locking and unlocking faster than might sound.

When I'm away from home, the Protector chain stays behind locked in the garage, I take the two DIB D-Locks with me as Sold Secure Motorcycle Gold rated portable security.

For shorter stay parking, the battery remains locked to the eBike. There's space inside even the smaller DIB shackle to fit frame, wheel and stand, but a step-through frame and seatpost-mounted battery limit possible locking points making it very awkward to secure both wheels to the frame and stand in this way.

To work around this, I use a folding lock (or flex cable) and my bike's built in frame lock as secondary security for locking the wheels to the frame. I can then use the DIB D-locks to easily lock the front and rear of the frame to the cycle parking stand without having to worry about also getting a wheel through each shackle.

The larger DIB fits around both seatstays and a Sheffield stand.

All in all, I'm very pleased with my keyed-alike Pragmasis locks and chain and would happily recommend them to anyone else looking to secure a high value electric bicycle both at home and when out and about.

Purchased DIB lock and IImm chain with noose link for carry on motorcycle security. Chose this package as it enables lots of different combinations to lock motorcycle to either immovable objects or through the frame and wheels. Despite 11mm chain not being recommended for carry on security,(I chose it for weight and packaged size to carry on my motorcycle), the quality and overall visual deterrent is outstanding, as is the DIB Lock. I have great confidence in Pragmasis products having previously purchased lock and chain for home security. Thanks for providing these fantastic products.

Both the large and small DIB lock purchased as they offered greater flexibility than a padlock to secure some machinery with the 16mm chain. Reassuringly sturdy and very smooth to operate. Would not hesitate recommending.

Why buy this D-lock and not another brand? This is a motorcycle grade lock with a 16mm shackle the Record 42" boltcutter can't crop. Other locks may have a cropable shackle, if the shackle is 16mm or bigger it should not be cropped but these locks is higher priced. Sometimes it can be hard to compare locks if they are not tested, but I believe that this lock is hard to defeat.