Folding Bike Lock Sold Secure Gold: What the Rating Means for Security

A Sold Secure Gold rating means a folding bike lock has passed an independent attack test using heavy-duty hand tools. No maker's own scale produces this certification. The broader context sits in bike lock certifications, the overview of how Gold fits within the full rating system. Gold testing is conducted by a UK-based independent body, and a certified lock must resist sustained attack for about five minutes per method.¹ Bike theft is a large problem: an estimated 2.4 million bikes are stolen in the United States each year.² This article explains what the Gold certification covers, how locks are tested, and what the rating means for folding locks.

Key Takeaways

• Sold Secure Gold certification comes from an independent UK testing body, not the lock maker, and requires resisting heavy-duty tool attacks for about five minutes per method.
• Gold-rated folding locks are tested against bolt croppers, hacksaws, and crowbars. Diamond adds power tools including angle grinders, a standard no current production folding lock achieves.
• Several UK cycle insurers require Sold Secure Gold or higher for bikes valued at £1,500 or above.⁴ This makes the rating a policy condition for many riders, not just a quality signal.

What Is a Folding Bike Lock Sold Secure Gold Certification?

Sold Secure is an independent UK security testing body based in Rugby, Warwickshire, certifying locks, safes, and other security products after physical attack testing. It operates without ties to any lock maker or retailer. Sold Secure Gold is the third tier in the Sold Secure pedal cycle rating system, rated "very good level of resistance against the dedicated thief" for use in high-risk environments.¹

The certification's value comes from its source. When a lock maker uses their own internal scale, those numbers are not comparable across brands. Each scale has a different starting point, different tools, and different time thresholds. Sold Secure Gold sidesteps all of that: it comes from one body running one standard test, and every Gold-rated lock has passed the same test.

For folding locks, Gold is the highest independent certification available. No folding lock achieves Diamond, the tier above Gold, because Diamond testing requires resistance to power tools including angle grinders. The folding-link format makes joints and plate edges vulnerable to angle grinder contact in ways rigid U-lock shackles are not. The bike lock security ratings comparison covers all four Sold Secure tiers across lock types.

Gold certification tells you something a maker's own security scale never can: a third party ran a standard attack and the lock held. For a folding lock buyer, it is the clearest available signal of verified protection.

How Does Sold Secure Test a Folding Lock for Gold?

The specific testing procedure is not published in full. Sold Secure withholds the exact tool specs and attack order to prevent thieves from working around the test. What is publicly documented is the attack type, tool, and time.

For the Gold tier, a lock faces heavy-duty hand tools for a sustained period. Sold Secure's official records confirm the Gold test uses "an extended attack with heavy duty tools."¹ Independent cycling publications consistently report about five minutes of sustained attack per method, covering tools including large bolt croppers, TCT hacksaws, crowbars, and lump hammers.³

Every test runs at Sold Secure's facility, run by their own engineers. The lock maker is not present, and the result is not adjustable after submission. A lock either meets the threshold or it does not. When a product is changed, re-certification is required. A Gold rating earned three years ago on one production batch does not automatically extend to a newer model.

For a folding lock, the joints between plates are a specific test focus. A well-made folding lock uses hardened steel plates at each link, connected by rivets. The joints are the weakest point, since a pivot levered apart bypasses the hardened plate material entirely. Gold-level testing checks both the plate hardness and joint strength under sustained force.

"Products are certified with a Sold Secure rating based on how long they can withstand specific tools and common theft techniques, such as bolt cropping or lock snapping."

Sold Secure, UK-based independent security testing body¹

The audit record behind Gold certification is what sets it apart from a maker's own claim. The tools used, the time under attack, and the pass or fail verdict are all on record with a body that has no commercial interest in the outcome.

What Attacks Does Sold Secure Gold Test Against?

Gold-rated folding locks are tested against the full range of heavy-duty hand tools a determined urban thief would carry. Documented attack types include large bolt croppers, TCT hacksaws, crowbars, and lump hammers.³ The lock must resist all tested methods for the required duration. Failure on any single test fails the certification.

Hardened steel is a heat-treated metal alloy processed to increase its surface hardness and resistance to cutting and abrasion compared to standard mild steel. It is the primary construction material in Gold-certified bike locks, and plate hardness directly determines how long a hacksaw or bolt cropper needs to work through a link.

Two categories fall outside the Gold test scope:

• Angle grinders. Power cutting tools are part of the Diamond tier, not Gold. A cordless angle grinder, now widely used by professional bike thieves, defeats most folding locks faster than a top-tier rigid lock when applied directly to a steel plate or joint.³
• Electronic attacks. Gold testing addresses physical attack resistance. Signal relay, RFID cloning, or electronic bypass attacks are outside the Sold Secure pedal cycle certification scope.

The distinction between Silver and Gold hinges on the specific tool sizes permitted in testing. Silver requires resistance to a standard bolt cropper. Gold requires resistance to a larger tool, about 24 inches in jaw span, which develops much more force on the same cutting edge. A lock that passes Silver testing with room to spare can still fail Gold when the heavier tool is applied at the same time threshold.

Plate thickness in the lock links directly affects how long a Gold-tier tool needs to work through a section.³ Seatylock Foldylock plates measure 6.5mm of hardened steel, compared to 5.5mm found in similar certified rivals. That extra millimeter extends attack time under the larger Gold tool set. The 18% difference in plate depth is not cosmetic. It is the gap between a lock that holds under Gold-level testing and one that does not.

Gold-certified folding locks address the realistic threat for the vast majority of cyclists: opportunistic and semi-professional thieves carrying hand tools. A targeted professional using power tools is a different category, and one no current folding lock format independently certifies against.

How Does Sold Secure Gold Compare to Silver and Diamond?

The four Sold Secure pedal cycle tiers are not separated by duration alone. Each step up adds a higher-grade tool category to the test. The table below maps each level to its threat type, tool category, and use environment, drawn from Sold Secure's official rating descriptions.¹

The key distinction between Gold and Silver is the tool category, not just the duration. Silver uses an enhanced tool list. Gold upgrades to heavy-duty tools including large bolt croppers, absent from the Silver standard. A lock passing Silver at the required duration still faces a different threshold when a large bolt cropper is applied.

BikeRadar, an independent cycling review publication, describes Gold locks as "a sensible choice for bikes likely to be locked up for significant periods of time in public areas."³ The step from Gold to Diamond is larger still. Diamond requires power tools including angle grinders. There are currently more than 100 bike locks rated Sold Secure Diamond,³ but all are rigid-format locks. No folding lock achieves Diamond.

For riders choosing between Silver and Gold, the decision narrows to risk level and bike value. A Silver lock for a commuter bike parked in a lower-risk area for under two hours is a defensible choice. A Gold lock for a bike worth more than £1,000, parked in a city center often for most of the work day, is the appropriate match.³ The Sold Secure Gold overview covers what the certification means across lock types beyond the folding format.

Does Bike Insurance Require Sold Secure Gold?

Several UK cycle insurers explicitly require a Sold Secure Gold or higher rated lock to validate a claim for a bike stolen from a public location. Bikmo, a UK-based dedicated cycle insurance provider, requires policyholders to use a Sold Secure Gold approved lock to meet their policy locking conditions.⁴

The requirement typically varies by bike value. For bikes valued at £1,500 or above, insurers including Bikmo and Sundays Insurance require Sold Secure Gold or Diamond. For bikes below this threshold, Silver is often accepted.⁴

Riders who own a bike worth more than £1,500 and use a Silver or unrated lock face a direct risk.⁴ A theft claim may be declined because the required lock standard was not met. The insurer can reject the claim regardless of how carefully the bike was secured. The certification stops being a quality signal and becomes a policy condition.

UK theft data adds context. Research from The Best Bike Lock found that 71% of UK bike theft victims did not report the crime to police.⁶ Official records capture fewer than a third of actual incidents. A Gold-certified lock both satisfies insurance policy conditions and provides a deterrent against the larger unreported pool of theft attempts, not just the minority that appear in statistics.

A quick check saves a rider a lot of pain. Open the policy document and search for "Sold Secure." If it appears, the exact tier required is written right there. This takes two minutes. Finding out after a theft that the lock did not meet the required standard means the claim is gone and the cost falls on the rider.

Two points worth confirming before purchase:

• Check the exact lock requirement in the policy wording, not just the summary page. Some policies specify Sold Secure Gold; others accept any Sold Secure-approved tier for lower-value bikes.
• Most insurers also require the bike was secured to a fixed anchor, not just locked to itself. The lock rating and the anchor rule are two separate conditions.

For riders whose insurer specifies Gold, the insurance approved bike lock guide covers how to confirm specific policy requirements and match the required rating to a certified lock.

How Do You Verify a Lock Has a Current Sold Secure Gold Rating?

The most reliable method is the Sold Secure website's product database at soldsecure.com. The organization maintains a live, searchable list of certified products. A Gold rating listed there confirms the lock passed the test and the certification has not been withdrawn since.

Three steps make the check more reliable:

1. Search by the exact product name or model number. Multiple products from the same brand often hold different ratings. Searching by brand alone will not confirm which specific model carries Gold.
2. Confirm the pedal cycle category. Some locks hold ratings in multiple categories at different levels. A lock rated Gold for motorcycles and Silver for pedal cycles is not a Gold-certified bike lock. The pedal cycle Gold listing is the one relevant to bicycle security.
3. Check for any re-certification notes. Certifications are tied to the specific product version tested. A change to the product needs a new submission.

The lock packaging often displays a Sold Secure Gold badge with the organization's shield logo, licensed only to products passing the official test. It is a secondary confirmation, though. A badge on older stock could predate a certification withdrawal. The primary confirmation is always the live soldsecure.com listing.

Seatylock's internal color scale maps directly to Sold Secure certification levels. A Gold-color security badge on a Seatylock product corresponds to Sold Secure Pedal Cycle Gold. A Diamond-color badge corresponds to Sold Secure Diamond where applicable. This 1:1 mapping means the badge on the product reflects the official certification level, a practice not universal across the industry.

What Makes a Folding Lock Qualify for Sold Secure Gold?

Three physical characteristics determine whether a folding lock passes the Gold test: plate material, plate thickness, and joint integrity. All three must work together. Strong plates with weak joints fail the test. Thick mild steel without hardening fails the test. Gold requires the full combination.

Which Foldylock Models Carry Sold Secure Gold Certification?

Several Foldylock models carry Sold Secure Gold certification. The Foldylock Classic is the direct Gold-certified option for urban commuters seeking certified protection with a lighter carry weight. Built with hardened steel links and anti-drilling rivets, it meets the Gold test rules while staying manageable for daily use.

The Foldylock Forever and the Foldylock Elite carry both Sold Secure Gold certification and ART 3 Stars. ART 3 Stars is an independent Dutch certification requiring resistance to power tools as well as hand tools. Holding both certifications on a folding lock is unusual. ART 3 sets a higher bar than Gold in several attack categories, and carrying both demonstrates the underlying construction exceeds what Gold alone requires.

The ART 3 certification for folding locks covers the test methodology in detail. It explains why ART 3 sets a different standard from Sold Secure and what dual certification means in practice.

All three models mount on the bike frame via a rattle-free bracket, included with purchase. The friction-dampened joints keep the lock quiet in transit. A certified lock does its job only when it is on the bike. The bracket system solves the daily-carry problem without requiring a bag or additional equipment.