I'm an old guy and I have bought almost every coupler lock made. They're all trash...easy to pick and easier to cut off. Except the Icon. The Icon is the best trailer lock made in the world and nothing is even close. Finally a lock that actually secures your trailer. This is my second one and Altor even keyed it to match my first Icon lock at no extra charge. It costs more than cheaper locks but it's the cheapest insurance you'll find against theft. A thief will take one look at it and move on to the next trailer.

After getting our bikes stolen at home for the second time, I did a thorough research on the best locks in the entire world and this was by far the best ones.

It’s huge, robust and heavy! and if you haven’t seen any videos about grinding locks please check how easy it is to grind any lock and then how impossible it is to grind this one! Even lock picking is way more complicated.

If you have a good bike definitely worth the money!

The only con is how heavy it is(5kgs) and given how light my bike is 5 more kilos is important to consider. But if safety is paramount for you then go for these!

Can’t recommend these more!

The customer support team was incredibly fast responding with help to deliver these swiftly to London!

Amazing product and awesome support ⭐️ ⭐️ ⭐️ ⭐️ ⭐️

It is a heavy lock that looks and feels unstoppable

This lock is a beast! I'd think the sight of it alone would be a deterrent to a would-be thief.

Opening it can be a bit tricky requiring working the key around a bit -- presumably that's attributable to the lock being designed to be difficult to pick. But it can be a bit fussy and awkward to open depending on how the lock is hanging. I recommend practicing with it some before using it in the wild, particularly if you're going to be in situations where you want to open it in a hurry.

The weight is formidable. Not an issue for my ebike, but I can see why some would buy it with intent of leaving it at a preferred parking spot. If riding with it, the challenge is how to carry it. I've been dangling it from the top tube but that's admittedly a bit awkward with the width of the lock and is noisy over bumps. If it gets too annoying I might hanging it from the top tube with a couple of heavy duty velcro straps with multiple wraps.

Also worth noting that the shackle very thick, which is by intent to help protect against angle grinders. So thick I can't get it through my spokes, so you may want to add a cable if you want to secure your wheel(s) along with your frame.

If size, weight & price are secondary to securing your bike frame (as they are for me) this is the lock.

This lock is HUGE! I purchased one for my zugo ebike and honestly it's so huge and heavy I don't think any thief would bother trying to cut through this thing. Other than the fact that the lock is super heavy, I think it's the perfect lock for anyones expensive investment!

These locks are massive! I wanted a lock that could be left at home for locking up my bike. I can see that nobody is going to be able to take this off without a lot of time and work which is great! The one thing I've been pondering is what the best way is to use this lock as the only place I could see it fitting is on my ebike is directly on the frame. It's too large to through a wheel so maybe at the bottom of the frame to be in the way of the pedals??

so heavy lock, and you use abloy keys

I’ve only just received my altor lock and used it twice and so far so good. I would love to have an accompanying chain lock to give my bike that “ foolproof look”

I had the misfortune of ordering this lock just as they went on backorder. While the wait was long, it proved to be well worth it. These locks are no joke. I can't imagine that a thief will bother even trying to cut through this thing. They are heavy so don't plan on doing long rides. That said, they are worth every penny. I think this will be the first time I walk away from a bike and feel like it's actually secure.

I found the Altorlock a bit short. So to lock my bike up I have to leave the stand up and lean my bike right up close to the locking frame. Then it just fits and l am able to lock my bike. Then the peace of mind I have knowing that my bike is securely locked up is worth the money on it's own. The lock is very heavy so I appreciate it may not be practical to make it longer. But I'm happy that I have what looks like the most secure lock on the market.

Heavy-duty and different than any other lock.

Here in Germany we are a target of the so called "east european bike stealing mafia". So I did some research what are the best Locks available on the market. I soon realized that if you relie on strength alone, you are fcked. ;) Even the strongest Locks are cut into pieces within seconds (or a few minutes). This Lock-the Altor SAF- is the only Lock on the market I found after weeks of research in the web wich can resist the standard tools of a bike thief (hydraulic/2 or 3 ft. bolt-cropper, (small) angle grinder, car lifter, bolt shooting pistol (sry, I don´t know how this is called in english), car lifter, hammer, etc.)
I´m an industrial mechanical and so I know that there is no kind of hardened steel or other metal that could resist an angle grinder attack for long!
The idea that makes this lock so safe is simple and genius at the same time! I´m really happy that this Lock has been constructed, build and now is available.. :D

Great lock

OK, I've owned the SAF Lock for just over a month now and here's my initial review:
1) Shoulda named it "Ludicrous!" or "Absurd!" It's laughably large. Impressively heavy. It dwarfs any other typical bike lock out there (Squire padlocks and Almax chains aside). I pictured it next to my Kryptonite NY Fug and K4 mini for perspective. But that said, it fits in a pannier and can be carried if you need to.
2) I've been carrying it on the bike to use for short lockups. It's heavy and affects bike handling, but not any more than a visit to the grocery store for supplies.
3) Entering the keyway is a bit challenging. Hard to find "blind" by feel with the key tip. I'm very experienced with all manner of locks & keys and have no problem using most keys "blind." Well, this one is hard if you don't orient the key the proper direction. And the proper direction is not parallel with or perpendicular to the plane of the lock. It's at a strange angle and I still haven't become accustomed to where that is. This is a minor inconvenience.
4) Sticky on and off. ALTOR put two dimples of rubber on the shackle tips to give you a solid "clunk" when the crossbar has fully closed. Sometimes it's harder to close, given the balancing act between the heavy shackle and crossbar.
5) Ease of locking the bike:
- First off, my usual locking option was out right off the bat: through the rear wheel in between the stays to a post because the shackle's WAY too big for any traditionally-spoked wheel. Would work with a paired spoke wheel like Rolf, et al though.
- Second, I DO NOT lock via the top tube. Too easy to cut the frame. I feel Altor's advertisements with the lock casually hanging on the top tube invites frame cutting.
- Third, for my horizontal top tube frame, the SAF lock will not pass through the head tube as I originally hoped. Top and down tubes are too close for the SAF Lock. This will be true for anyone riding small(er) bikes or those with top and down tubes really close where they meet the head tube. This bummed me out because I advocate for head tube locking for added security (two tubes to cut, cables & stuff in the way).
- Fourth, I lock the seat tube. For two reasons: it's almost vertical and that makes locking straight across horizontally to a parking meter or bike rack easier. The seat tube is harder to cut. It has another tube within it - the seat post. I actually went out of my way and ordered a extra-long post to make frame-cutting harder.
- Fifth, It occurred to me that the seat tube can be reinforced two more ways: 1) Add something within your seat post to prevent angle grinder attack. A steel or aluminum rod or a length of old chain would work. (Sure, they might rattle around, but that's easily fixed with an old inner tube or plastic tubing.) Yes, this adds weight, but for some of us, it's worth it. 2) I'm thinking of bolting on a piece of 1/8" or 1/4" titanium stock (or even 90-degree angled stock) to my seat tube water bottle bosses as an additional (and visual) way to deter thieves considering cutting my frame. A length that would fit between the down tube at the BB and the top tube at the seat cluster would fully protect the seat tube and act as a good deterrent.
6) I'm glad to say the Altor fits around the "reinforced" parking meter poles that were popular a decade or two ago in some urban areas. The old mini locks often didn't fit the diameter.
7) Since I was no longer able to secure my rear wheel with my u-lock anymore, I realized I needed to incorporate a longer cable leash for both wheels now (in addition to using secure skewers). However, the loop on most cables is not nearly large enough for the Altor SAF. BUT, have no fear! Just use one loop end as a slipknot and bend a section of the cable tightly and run it though the loop. You now can secure one end of your cable after slip-knotting it through your front wheel!
8) 4 keys!
A neighbor on ND just had his secure garage broken into and his Kryptonite NY chain easily cut through and his bike stolen. And this is within a context of non-stop reports of burglary and bicycle theft. It's out of control, folks! So spend some time on bicycle (and home) security. If you're like me and own custom, irreplaceable bikes that mean a LOT to you, spend some dough, time and thought on safeguarding your valuable toys. Maybe add a Ring-type, WiFi-enabled, motion-sensing video camera.
So, I hope this review helps. Since I'm not currently commuting to a regular location daily, I am not using the Altor SAF Lock as the manufacturer intends. Even so, this is my #1 lock choice. But I live in a really high theft area (SF Bay Area) and I have always taken bike security seriously. I managed a campus bike shop that at the time in the 80's vied for the #1 worst theft location in the US with NY on a regular basis. And it's now WORSE than back then, thanks to powerful angle grinders.