Weight is the honest measure of how much steel a lock actually carries · review
A combination chain lock in 6 mm manganese steel with a five-digit cylinder, a fabric cover and a dustproof cap.
Our conclusion The first chain lock on this page, and it publishes the figure that matters most on a chain: 6 mm manganese steel links. A five-digit combination with a correctly stated 100,000 combinations, a fabric cover that keeps the chain off the paint, and a warning about its own 1.3-inch lock head. What it does not have is any independent certification, which the buying advice on this shelf says can decide an insurance claim.
A chain lock in 6 mm (0.236”) manganese steel, with a five-digit combination cylinder in zinc alloy, a polypropylene fabric cover, a dustproof cap over the keyhole, and a resettable code. Lengths of 3.2, 3.6 and 4 ft — 97.5, 110 and 122 cm (48 in). $13.99.
The introduction to this page describes three formats, and what a chain is for: it “covers the most anchor points while being the heaviest to carry”. The five locks published here are two D-locks and three folding locks; none is a chain.
So this fills the gap, and the trade it brings with it is the one the introduction names. A chain goes round a lamp post, a railing, a thick stand and two bikes at once, where a D-lock reaches only what fits inside its shackle. It is also the format that is heaviest for the security it gives, because a flexible chain cannot resist leverage the way a rigid shackle can.
“Crafted from ultra-thick 0.236”/6 mm manganese steel.”
That is the number, and it is the one the tag on this shelf is reaching for: weight is the honest measure of how much steel a lock carries, and link thickness is the same measure in another unit.
Six millimeters is thicker than the Toptrek folding lock already published here, whose links are 5 mm (0.20 in). It is far thinner than the Kohlburg D-lock’s 14 mm (0.55 in) shackle.
What that means in practice: a 6 mm (0.24 in) link is a deterrent against hand tools and opportunists, and it is within reach of a decent pair of bolt croppers. This is a lock for a café stop, a station rack in daylight, or locking two bikes together — not for leaving a valuable bike overnight in a city.
“The advanced 5-digit combination lock offers… up to 100,000 possible combinations.”
Five digits, ten options each: 10⁵ = 100,000. Listings on this site routinely round, exaggerate or invent such figures; this one is exactly right.
“Virtually impossible to crack” is the overstatement beside it — a five-digit dial lock is not attacked by guessing the code, and nothing on this page assesses how a lock resists attack.
“The initial password is 00000, and when it’s time to set a new password, simply keep the number wheels in the correct unlock password state and rotate the reset dial 90°.”
Two useful facts: the factory code, and the mechanism. Change it from 00000 before using the lock — a combination lock left on its factory setting is an unlocked lock.
The Mivelo and Toptrek folding locks published here are also combination locks and neither listing explains the reset.
“Flexible high-quality polypropylene fabric cover protects your hands against heat or cold, prevents chain from rust, and keeps the bike paint from scratches.”
A bare chain lock swung against a frame is the fastest way to chip paint, and a wet chain rusts into a solid bar. The cover is not a security feature and it is the reason a chain lock survives being carried.
The dustproof cap over the keyhole is the other maintenance detail: a combination cylinder full of road grit is a cylinder that jams.
“Note: the bicycle lock head diameter is 1.3 inches. Before making a purchase, ensure that the gap between the tires or the hole you need to pass through is compatible.”
Thirty-three millimeters of lock head. That is the dimension that stops a chain being threaded through a wheel between the spokes and the stays, and it is the kind of figure almost nothing publishes.
The buying advice on this shelf asks you to measure around the stand you actually use. This listing asks you to measure the gap as well — and offers the fallback: “you can still lock your bike by wrapping the chain around it, rather than threading it through the wheel’s gap”.
The introduction to this page is explicit: whether an independent scheme — ART in the Netherlands, ADFC in Germany — has assessed the lock “is the only claim on a lock you can check”.
This listing names none. The TitanLock published here states an ART certification and the Kohlburg an ADFC recommendation.
And the buying advice goes further: “read your insurance policy: several name a certification scheme, and an uncertified lock can void a claim however solid it is.” At $13.99 that is the trade being made.
The title offers 3.2, 3.6 and 4 ft. The fifth bullet says “with options available in lengths of 3.2 ft”.
One figure against three. Check which length is in the basket before ordering, because length is what decides whether the lock closes round the stand.
No weight — as with every lock in this hub, which the introduction calls a real gap; the 640 g on the shipping record is the parcel. No certification, no link count, no cylinder rating, no frame bracket, which three of the five published locks here supply.
Read on the day this page was built: $14 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.
| Format | Chain lock |
|---|---|
| Links | 6 mm (0.24 in) (0.236") manganese steel |
| Cylinder | 5-digit combination, zinc alloy, 100,000 combinations |
| Factory code | 00000 — change it before use |
| Reset | Hold the unlock code, rotate the reset dial 90° |
| Lengths | 3.2 / 3.6 / 4 ft (97.5 / 110 / 122 cm) per the title |
| Lock head diameter | 1.3 inch (33 mm) — check your wheel gap |
| Cover | Polypropylene fabric, anti-scratch, anti-rust |
| Keyhole | Dustproof cap |
| Certification | None — no ART, no ADFC |
| Weight | Not published; 640 g (22.6 oz) on the shipping record |
| Frame bracket | Not included |
| Amazon reference | B01N67GAGC |
| EAN | 0766330255182 |
For a café stop, a daylight station rack or locking two bikes together, it is a real deterrent — and it is thicker than the 5 mm (0.20 in) links on the Toptrek folding lock already published here. It is also far thinner than the Kohlburg D-lock’s 14 mm (0.55 in) shackle, and a 6 mm (0.24 in) link is within reach of a decent pair of bolt croppers. Nothing on this page assesses how a lock resists attack; what it reports is the published steel.
It can decide an insurance claim. The introduction to this shelf calls independent assessment — ART, ADFC — "the only claim on a lock you can check", and the buying advice adds that several policies name a scheme and that an uncertified lock can void a claim however solid it is. The TitanLock published here states ART and the Kohlburg ADFC. This states none, at $13.99. Read your policy before deciding.
Measure the gap. Sportneer publishes the figure that decides it — a 1.3 inch (33 mm) lock head — and asks you to check "the gap between the tires or the hole you need to pass through" before buying. If it will not pass, the listing gives the fallback: wrap the chain round the frame and the stand instead of threading it through the wheel. Almost no lock listing publishes its head diameter at all.
A café stop or a daylight rack, or locking two bikes together
Amazon reports what buyers took in the month before this page was last checked: at least 7,000.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for bike gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
85 cm (33.5 in) hardened steel · 3 keys · bracket included
A hardened steel folding lock at 85 cm (33.5 in) from a long-established German bicycle parts maker, supplied with three keys and a frame bracket, and the best-selling lock in this hub.
Best for: Everyday city parking where a serious deterrent matters more than a certified grading.
≈ $86
14 mm (0.55 in) shackle · ADFC recommendation stated · 1.7 m (6 ft) cable
A large D-lock with a 14 mm (0.55 in) hardened shackle and an ADFC recommendation stated by the manufacturer, supplied with a 1.7 m (6 ft) cable for the front wheel and accessories.
Best for: Anyone leaving a bike in a city where theft is a real prospect, and who is prepared to carry the weight.
≈ $89
85 cm (33.5 in) folding · combination · 8 links · bracket
The combination-code folding lock in this hub — 85 cm (33.5 in), eight links on hardened rivets described as waterproof — for riders who would rather not carry a key at all.
Best for: Riders who share a bike, or who are tired of carrying and losing keys.
