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Pragmasis Shed Shackle security anchor



As secure as your bikes can be in a shed without a ground anchor

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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Ground anchors are fantastic if you've got a bit of hard standing to drill into, but what if your shed's on decking or earth? The Pragmasis Shed Shackle is the next best thing.

The Shed Shackle is a reinforcing kit for your shed that turns the shed wall into a secure locking point. You get a hardened, powder coated steel shackle and two long plates, plus a short one, and the bits go together to form just about the most secure option available to anyone without a proper floor.

The main shackle fits to a vertical beam of the shed, and the short plate can be used to bridge horizontally to the next beam to help resist twisting attacks. Pragmasis supplies shear bolts that break at a certain torque to leave a smooth conical surface. The shear bolts can dig into the wood a bit if it's soft but the nut does eventually come off, so perservere.

Once fitted it’s impossible to remove without removing the section of shed wall that it's anchored to. I'm on my second shed shackle, the first still being firmly attached to the shed wall at my old house.

The lock loop is 50mm tall, so you can get in a hefty chain (Pragmasis says it'll take two of the company's Protector 11mm chains, or one 13mm and one 11mm at the same time) or other beefy lock. No point compromising here, it's not like you need a lock you can carry around.

Unlike a ground anchor the shackle fits at frame height which makes it a bit easier to use, and improves security by making it harder to rest your lock on the floor for attack by bolt croppers.

The array of pieces means that you can fit it pretty much anywhere that's convenient. When not in use it's unobtrusive and only juts out a couple of inches from the shed wall.

Pragmasis claims to have sold over 1,000 Shed SHackles, and never one defeated, or even attacked. There's also a version for steel sheds if you want to beef up the security of a metal bike shelter.


It’s hard to imagine how a shed-mounted anchor could be more secure, or more versatile, and if you can't fit an anchored lock point then this is a great next bet.

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Make and model: Pragmasis Shed Shackle

Price: £49.99

Weight: 2260g

Size tested: n/a

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Did you enjoy using the product? yes

Would you consider buying the product? I have in the past and would again

Would you recommend the product to a friend? yes

Overall rating: 9/10

About the tester

Age: 36  Height: 190cm  Weight: 105kg

I usually ride: Schwinn Moab, urbanised with 700cs  My best bike is: Trek 1.5 with upgrades

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Experienced

I regularly do the following types of riding: time trialling, commuting, general fitness riding, fixed/singlespeed, mtb, Mountain Bike Bog Snorkelling


Dave is a founding father of, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.

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