On-Guard Mastiff Keyed Chain Lock

I've had this lock since summer 2016 though to be fair I've got two bikes of different values so I use 4 different locks. Two including this lock and an Abus lock on my more expensive bike when I'm out, a different Onguard scooter lock with my more expensive bike in my shed and a fourth lock, MasterLock, for my cheaper station bike.This lock is clearly marked as Sold Secure Gold on the actual lock. The lock is smooth and well made. If the lock your receive doesn't fit both of these criteria then it is not an original. I should add none of the bike locks I have from different manufacturers feel rough from new.Like all the bike locks I have from Onguard, Abus and Masterlock it is is impossible to lock this lock up without using the key. One of the keys you receive in the bundle should have a light on it but to be honest I use one of my front bike lights when locking/unlocking it and the other lock I use if it is dark, so I can't tell you how useful it is.Unlike the other posters I've been lucky and not have had problems with the barrel getting stiff after months of use.This is probably due to the fact that the bike I use this lock on tends not to be left outside unattended for more than a few hours. Therefore I rightly cannot say what the durability of this lock is if left to the British elements for months.The main issues with the lock are:1. That while it is a large D-lock it only works on standard bike racks. If you are locking the bike properly - by which I mean through the frame and back wheel* - to a lamp post or non-standard bike rack the lock will not fit. In my case as I use a Abus cable lock as well so I can always lock both my wheels and frame up. (I do have a cable to lock my saddle but actually haven't used it.)2. The lock is heavy. I actually carry the lock in my rucksack and I can feel the weight difference with it in and out. Due to being female and the bike I use it on not having a horizontal cross bar, there is no way for me to fit it to the frame if I want a water bottle. I suppose I could bungee cord it to the pannier rack to carry it on my bike but I really can't be bothered. Either way I've not used the flimsy looking bits of plastic that come with the lock to attach it to the frame.I should add if you have quick release wheels and are locking it to a standard bike rack, then the lock is big enough for you to take the front wheel off, put it against the back wheel and lock both wheels plus the frame filling the entire lock. I don't tend to this as it is a hassle.Does this lock work? The only time someone has attempted to steal my bike I hadn't secured my front wheel with the Abus chain lock and so they undid my front wheel. Oddly they didn't steal it so either someone disturbed them, or they realise that nicking the wheel without the bike was pointless and this lock worked as a deterrent.In regards to bike thieves - if the thief is determined and your bike is worth it they will break through any lock and no one is going to argue with someone with an angle grinder. Anyway if you lock your bike properly and use two different types of lock to lock the frame and each wheel, whether you have quick release wheels or not, unless the thieves have plenty of time not to be seen so identified they won't steal your bike when locked. This doesn't mean they won't use other tactics to get the bike off you but that is an entire different matter and one reason why I have a station bike.*If you don't know how to lock your bike so it makes it harder for thieves to steal there are plenty of videos on YouTube from different UK police forces plus cycling organisations and individuals who work in the bike trade in the UK and North America. 80-90% of the bikes I see locked up are locked up poorly which actually helps you if you lock your bike up properly.

Extremely sturdy, will certainly put off the casual bike thief. Any would be thief would need to be extremely "tooled up" to remove this.Pretty heavy, but as I'll be using with a ground anchor at home not really a problem for me, but you may want to consider something else if you are planning on attaching to bike etcOnly real negative I've seen about this lock (and it's too early for me to tell) is that lock can start to get seized up over time - but to be fair that can be case with any outdoor lock so I've also bought some luck lubrication and will apply once or twice a month.

I went on to different sites before purchasing this product and its name says it all. Pit bull! The reviews were always great and if you bought this from a specialist shop you would expect to pay up to 40% more. If you have bought a bike for a tidy sum of money then its worth forking out a bit more to keep it safer and whilst no lock is 100% full proof, it will deter would be thieves just based on its look alone. They would certainly have to spend some time hacking at it and then some. It give me total peace of mind.It looks good but I must admit that it is quite heavy. It probably weighs just under a kilo I have read that you can attach it to the bike however if I am going to the town centre etc I am happy to carry it in a ruck sac on my back. It also comes with 5 keys (yes!) and the lock flashes so that you can see where to insert the key when it's dark. I would certainly recommend this product.

We just bought two ebikes and needed some gold rated locks to comply with the insurance. I ended up buying two of this size, and one of the smaller 23cm ones. These locks are large, no doubt about it, but to be able to secure two bikes to something, or indeed just to secure the front wheel on my bike to the frame, this size is necessary. The combination of wheel size and suspension forks on my bike meant that this size was needed in order to secure the front wheel to the frame, and as that is where the motor is on the EBCO bikes we have bought, it definitely needs securing! The pic shows what I mean - ignore the red tape, I've just colour coded the locks and keys, it isn't broken!Buying three locks (I did toy with the idea of four!) in one go seems like huge overkill, but when you have invested in expensive and therefore highly stealable electric bikes, it really seems stupid not to spend a tiny proportion of that substantial outlay on some decent protection.

This security chain looks strong and is, by all accounts well fit for purpose but in my opinion, is let down by a cheap looking padlock. Yes, the lock is stainless steel and hardened, but after only a dozen or so uses, I found myself twisting the key, this way and that, to try to unlock it; it was no longer a simple matter of inserting the key and twist to open. I have been worried that perhaps one day, the key will refuse me access to my bike. Before that happens, I am seriously considering purchasing a high security padlock to use with this chain before the assumed inevitable happens. The chain does a security rating of 6 out of 10.To be honest, I may have just had a duff one, but as I stated earlier, the padlock does not do justice to the chain.One the bright side, the chain comes with a fabric cover to protect the paintwork and you do get 5 keys with this product.If the padlock had worked every time, I would have given this product 5 stars.

This is my second lock, the first one lasted about a month and then the key stopped working. Amazon kindly replaced it free of charge which was appreciated. The replacement lock has lasted for at least 10 months now.Of note though that the mount it comes with is very weak and failed within 3 months, throwing my lock into the middle of the road. Also about 7 months in: one of the end caps fell off although it looks like it's just there for decoration.All in all a great lock and has kept my bike safe in and around manchester