On Guard- Save your bike from theft. The best bike U-lock today.

My experience


This lock has been a lifesaver for my bike – it hasn’t let anyone take a crack at it, which says a lot about how reliable it is. My main deal is that the shackle does its job without any hiccups, and the OnGuard nails it in that department. I’m in and out of locking and unlocking about 10 times a day – running errands, getting to work, you know the drill. I’ve had other locks that were just a pain, but this one with its solid tumbler and shackle is smooth sailing. If it ever gets a bit sticky, a squirt of WD40 (like the owner’s manual suggests) does the trick. And here’s the kicker – each lock hooks you up with 5 spare keys and a tag for easy replacements. These folks know what they’re doing.


Bike Lock Types

First lets look at common types of locks.

There are Chain Locks, U-Locks, and Folding bike Locks

Chain locks, U-Locks, and folding locks vary in construction and functionality. Chain locks consist of interconnected chain links, secured at the ends with either a small U-lock or an integrated locking unit.

U-Locks, characterized by a U-shaped metal shackle that inserts into a locking mechanism, are commonly used due to their resistance against various cutting tools. They are compact, easily storable in backpacks, and can be mounted on bikes. However, longer shackle U-locks can become quite heavy and have limited reach for locking.

Foldylock Forever claims to be World's Strongest Folding Bicycle Lock -  Bikerumor
Folding lock. image credit: google

Folding locks address this limitation by providing extended locking options. These locks unfold to create a larger circle, offering more versatility in securing objects. While folding locks fold up compactly for convenient storage in backpacks or on bikes, the pivots connecting the arms may be vulnerable to drilling or leverage attacks.

Each type of lock has its unique advantages and drawbacks. Chain locks are durable, versatile in locking options, and resistant to theft attacks, but they can be heavy. U-Locks are resistant to cutting tools, compact, and easy to carry but have limitations in reach. Folding locks offer extended locking opportunities but may be susceptible to certain types of attacks due to their articulated design.


On-Guard Mastiff Keyed Chain Lock

Weight: 3.17 pounds
Shackle length: 9 inches
Pros: Impressive shackle length
Cons: Locking bar’s plastic components seem a bit flimsy

The Pitbull boasts a lengthy 9-inch, 14mm thick hardened steel shackle, perfect for wrapping around your bike frame and a fixed object. Its bolting mechanism securely locks the shackle at four different points. The lock comes equipped with a rubber coating and molded plastic covers to shield your bike’s finish. However, it’s worth noting that the locking bar incorporates a significant amount of plastic, potentially serving as a vulnerability during an attack.

On the bright side, the lock cylinder is positioned at the center of the bar, eliminating potential weak points for prying. In my attempts to cut the shackle with bolt cutters, the lock held up admirably, barely showing a scuff.

mastif-lifestyle.jpg
Mastiff U-lock. image credit: mastiff

This bike lock is ideal for cyclists seeking a robust and reliable security solution for their bicycles. Whether you’re a daily commuter navigating urban streets, a weekend adventurer exploring trails, or anyone in between, the Mastiff is designed to provide peace of mind and top-notch protection for your beloved two-wheeler. With its durable construction and user-friendly features, the Mastiff is a versatile choice for cyclists of all types and preferences.

Get it Now on Amazon

FAQ’s About Bike Locks


Are there testing and design standards for bike locks?
Absolutely! Bike locks usually come with security ratings like Sold Secure (Bronze, Silver, Gold, and Diamond) and the ART star rating (5 stars being the highest). Manufacturers might also throw in their own security ratings, but these don’t always follow an independent scale.

Can all bike locks be cut?
Yep, every lock can be cut or wrecked with the right tools and enough time. Even if a lock can be destroyed, it might take a thief ages to get through it. So, a lock still serves its purpose even if it’s cuttable.

Should I still use a bike lock even if I know it can be cut?
Absolutely! Most thieves are opportunists. If they can’t snatch your bike and dash, they’re less likely to bother. A solid-looking lock might discourage a thief from going through the trouble.

What tools do thieves use to cut locks?
Bolt cutters are the go-to for most bike thieves, but some locks might need an angle grinder. If your lock laughs at bolt cutters, you’re already winning. For the toughest locks, thieves might bust out torches or heavy-duty tools. Sometimes, they get creative with freezing chemicals.

Will a lock brand cover the cost of my bike if it gets stolen?
Some brands, like Kryptonite and OnGuard, offer reimbursement programs if your bike gets stolen. Check the fine print. Others might replace the lock but not your bike. These are often add-ons and might need extra purchases.

How should I carry my bike lock?
Depends on the lock size. Small ones can chill in your jersey pocket, while bigger ones might need a backpack or a mount connected to your bike. Carry it however, it’s most convenient for you.

Do bike locks require maintenance?
Not usually, but if your lock faces the elements often, it might wear down. Key cylinders and combo locks might get a bit sticky; a spritz of lubrication usually does the trick.

Do bike locks wear out?
They do, but not overnight. Exposure to the elements speeds up wear, especially on moving parts like hinges and cylinders. If you notice early wear, hit up the manufacturer to check if it’s covered under warranty.

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