At home is where bikes are stolen with power tools. Give them a problem measured in minutes, not seconds.
A Sold Secure Diamond chain through the frame into a concrete-bolted anchor is the difference between a theft and an abandoned attempt.
What actually happens
Overnight, outside your home, thieves bring what street thieves can't: time, vans and angle grinders. Unanchored bikes — even chained ones — get lifted, chain and all. The only overnight defence that holds is attaching the bike to the planet: a rated chain through the frame into a ground anchor set in concrete.
Grinder resistance is measured in minutes per chain grade — and minutes of showering sparks outside a house is exposure thieves won't buy.
Background: the theft and collision patterns above draw on our own analysis of official records — explore the rider data and methodology.
How does a chain and ground anchor work?
A security chain passes through the bike's frame and locks to a ground anchor bolted into concrete, so the bike cannot be lifted away. Chain grade decides everything: budget chains fall to bolt croppers in seconds, while a Sold Secure Diamond 16mm chain forces minutes of loud angle-grinding.
- 1Anchor firstA ground anchor bolts into concrete with shielded fixings. Without one, thieves lift the bike and chain together into a van, which is why an unanchored chain protects very little.
- 2Through the framePass the chain through the frame, not a wheel — wheels unbolt in a minute. Keep the chain taut and off the ground: slack chain lying on concrete gives a grinder something solid to brace against.
- 3Grade is timeSold Secure ratings measure resistance under sustained attack. Diamond-rated 16mm links cannot be cropped and must be ground, twice per link, in a shower of sparks outside someone's house.
- 4Add noise and coverAn alarmed chain or disc lock makes the attack loud from first contact, and a plain cover stops the bike being assessed from the street at all.
What to buy — the checklist
- ✓Sold Secure Diamond chain, 16mm+ links — the grades below fall in under a minute to a grinder
- ✓Through the frame, never just the wheel — wheels unbolt
- ✓Anchor into concrete with shielded bolts; a wall or floor fixing done properly
- ✓Chain off the ground and taut — slack chain on concrete is a grinder's workbench
- ✓Cover the lot: what can't be assessed from the street doesn't get attacked
Ad — we earn commission on the links below. When you buy through them we receive a commission from the retailer, at no extra cost to you. It changes nothing about what appears here: the checklist above is written first and the links are added afterwards.
Where to start looking
Chain: Diamond-rated 16mm
The grade that forces an angle grinder rather than bolt croppers.
~£90 · See options →
Anchor: concrete-in or bolt-down
The half most people skip — an unanchored chain gets lifted with the bike.
~£40 · See options →
Alarmed chain option
Adds a 100dB siren to the chain itself.
~£80 · See options →
Searches, not endorsements of a single listing — compare whatever you find against the checklist above. Want named picks ranked by attack rating? Best motorcycle security chains UK (2026): Sold Secure Diamond, ranked.
What changes once you own it
Your bike's overnight risk collapses: the lift is impossible, the grind is long, loud and bright, and the whole attack becomes a bad bet. Most riders who fit anchor-and-Diamond-chain properly simply stop being burgled for bikes — the attempt marks on the anchor tell the story of thieves who started and left.
Asked before buying
Can't an angle grinder cut anything eventually?
Eventually, yes — the product is time and spectacle. A Diamond-rated 16mm chain forces multiple loud, spark-showering minutes per cut, twice (both sides of a link). Outside a residence, that's an alarm clock for the whole street.
I rent / can't drill concrete — options?
Heavy portable anchors (filled, 30kg+ designs) and lamppost-loop setups are imperfect but far better than a chain through the wheel; pair with the alarmed disc lock so noise starts at first touch.
Is the expensive chain really worth double a cheap one?
The ratings exist because the difference isn't linear: budget chains fail to bolt croppers silently in seconds; Diamond-grade forces the grinder. You're not buying steel, you're buying the attack it takes to beat it.
How this page is funded. Some links here go to Amazon, and as an Amazon Associate we earn commission from qualifying purchases, at no extra cost to you. It changes nothing about what we recommend: the checklist above is written first, the links are added afterwards, and we hold no stock of this product and take no payment for placement. Where a product does not deserve a recommendation, we say so.
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