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Oxford Alarm-D Pro Review

8 min read

Oxford Alarm-D Pro Review

Oxford are back at it again with a new alarmed bike lock. This time around, they’ve revamped one of their old models, the Alarm-D. I  recently got hold of the new versions to produce an Oxford Alarm-D Pro review for those interested. 

If you’ve read my review of the best bike locks with alarms, or my in-depth review of the Oxford Alarm-D Max Duo, you’ll know high highly I rated the old model of this lock.

But what changes have Oxford made to the new Alarm-D Pro bike lock range? And Is the Alarm-D Pro a worthy upgrade?

I’ve put the new Alarm-D Pro locks to the test, to save you time, effort & money. To make sure I was hitting the nail on the head with this article, I also spoke with Henry Rivers Fletcher from Oxford, who gave me further guidance and information on the new Alarm-D Pro range. 

The information I’ve compiled below will help you understand if the Alarm-D Pro is suitable for you and your bike.

Let’s get to it.

Table of Contents
    Add a header to begin generating the table of contents

    Just before we get into the article I wanted to give you the heads up that there are three different versions of the Oxford Alarm-d Pro available:

    • Pro 260 (a smaller more portable version),
    • Pro 320 (a larger version with more shackle space) 
    • Pro Duo (the same as the 320 but with an extension cable)

    I’ll go into detail on their exact differences later but for now, you’ll understand when I speak about the different models!

    Overview - Oxford Alarm-D Pro Review



    Oxford’s newly released Alarm-D Pro 260 bike lock is a versatile, well-designed bike lock that’s seen multiple tweaks and improvements, which make it more secure than its predecessors.

    Weighing 1.51kg (3.32lb), this Sold Secure Gold rated bike lock is suitable for use on the go.

    With its simplistic yet effective mounting bracket, you’ll have no trouble carrying the Alarm-D Pro whilst cycling, and its powerful 120dB anti-theft alarm will give you the peace of mind required to leave your bike unattended in higher risk areas.

    All in all, the Alarm-D Pro 270 is a reasonably priced bike lock, suitable for any cyclist looking to increase the security of their bike.

    Oxford Alarm D Pro 260
    Total Weight: 1.48kg (3.26lb)
    Shackle Diameter & Material: 14mm Hardened Steel
    Internal Shackle Width: 9.88cm (3.89”)
    Internal Shackle Height: 20cm (7.87”)
    Sold Secure Rating: Sold Secure Gold
    Price: View up to Date Price [Amazon]
    Oxford Alarm-D Pro Bike Locks Colourful

    How Secure Is the Oxford Alarm-D Pro?

    When rating and reviewing any bike lock, security is one of the main factors to take into consideration. The old Alarm-D range gained the Sold Secure Silver rating, which was already very respectable, but how secure is the new Alarm-D Pro?

    When previously testing the old Alarm-D, it did have a couple of setbacks with its security. So naturally, I was keen to see how Oxford had improved the Security of their new Alarm-D Pro range.

    Security Features

    The Oxford Alarm-D Pro range use similar single-bolted shackle to the old Alarm-D locks. However, several tweaks have been made increase the security that the new Models offer.

    Firstly, the unbolted side of the shackle has been extended, and it’s angle increased. This improvement increases the resistance that the Alarm-D Pro offers against twist attacks.

    Twist attacks are a common method used by thieves to defeat bike locks. By inserting a large, strong object such as a crowbar or scaffolding pole through your lock, they attempt to twist the lock’s shackle and pop it open.

    Oxford Alarm-D Pro Bent Shackle Design

    Normally single-bolted bike locks are more vulnerable to twist attacks than their double-bolted counterparts. However, as you’ve probably realised, the Alarm-D Pro locks use an additional security feature to alleviate this vulnerability.

    If a thief were to move your bike whilst locked, a smart motion sensor would be set off, activating a loud preliminary warning tone.

    If the disturbance continued, the ear-piercing 120dB alarm would begin to sound, alerting any local bystanders and likely deterring the theft attempt.

    When I put the old Alarm-D to the test against the best bike locks with alarms, it was distinguishably louder than the other bike locks included in the test. 

    It was physically uncomfortable to be nearby the old version when the 120dB alarm was activated, and I didn’t need to listen for long to decide it drastically increased the security that the lock offers for your bike.

    Shackle width of the Oxford Alarm-D Pro

    The Alarm-D Pro range utilises the same powerful alarm system and is just as loud. An impressive deterrent.

    The shackle used by the Alarm-D Pro range is made from the same 14mm hardened steel as its predecessor, which provides respectable all-round resistance against sawing and cutting.

    Henry from Oxford let me know that they had their engineers working on increasing the strength and durability of the outer mechanism housing. 

    The old Alarm-D range had a 2.74mm thick outer mechanism housing, whilst the new Alarm-D Pro benefits from nearly an extra 1mm of protection measuring 3.6mm thick.

    Before After
    Alarm-D vs Alarm-D Pro mechanism housing thickness
    The Pro's mechanism housing is visibly thicker and will provide better protection.

    Whilst an increase of 0.86mm may sound like a minor change, this thickening allows the Alarm-D Pro to repel heavier impact attacks.

    There are many ways you can lock your bike with the Alarm-D Pro to make life much more difficult for thieves. I’ll teach you the most effective locking techniques later in the article.

    The Alarm-D Pro Duo comes with a 1.2m (3.94′) chunky extension cable, which is especially helpful for cyclists with quick-release wheels. This cable works effectively to prevent chancers and petty thieves from stealing your bike’s wheels. Handy!

    Again, I’ll show you how to use the security extension cable towards the end of the article.

    Security Ratings

    Oxford’s engineers work on improving the Alarm-D Pro’s security paid off. All three versions now sport the Sold Secure Gold rating, rather than the Silver rating which the old Alarm-D range was awarded.

    Sold Secure Gold bike locks protect your bike against dedicated attacks, where thieves may use a more extensive toolkit.

    Again, it’s worth noting that the 120dB alarm feature wasn’t taken into consideration when Sold Secure tested this lock. The alarm will startle and most likely scare off any would-be thief, increasing the overall level of security provided for your two-wheeled companion!

    On top of this impressive Sold Secure rating, the Alarm-D Pro range is Secure by Design accredited. SBD is a Police preferred specification (UK), which demands high manufacturing standards for a security product to be accredited.

    How Practical Is the Oxford Alarm-D Pro?

    Practicality is another important aspect to consider when buying a new bike lock.

    You’ll need a bike lock that you can easily take with you when you’re out riding, but also a lock that’ll provide sufficient protection for your bike and is capable of securing your bike to a range of immovable objects.

    Weight and Size

    The Alarm-D Pro 260 weighs 1.4kg (3.09lb), whilst the Alarm-D Pro 320 & Duo both weigh 1.53kg (3.37lb).

    Pro 260
    Pro 320

    Now, it’s clear that these locks are slightly heavier than similar D locks from other brands, however, the extra weight is understandable when you consider the 120dB alarm system this lock houses.

    Below I’ve displayed the weight along with the internal shackle measurements for all three of the Pro locks.

    Oxford Alarm D Pro 260
    Lock Weight: 1.4kg (3.09lb)
    Mount Weight: 0.08kg (0.18lb)
    Total Weight: 1.48kg (3.26lb)
    Internal Shackle Width: 9.88cm (3.89”)
    Internal Shackle Height: 20cm (7.87”)
    Oxford Alarm D Pro 320
    Lock Weight: 1.53kg (3.37lb)
    Mount Weight: 0.08kg (0.18lb)
    Total Weight: 1.61kg (3.55lb)
    Internal Shackle Width: 9.88cm (3.89”)
    Internal Shackle Height: 25.85cm (10.17”)
    Oxford Alarm D Pro Duo
    Lock Weight: 1.53kg (3.37lb)
    Mount Weight: 0.08kg (0.18lb)
    Extension Weight: 0.52kg (1.15lb)
    Total Weight: 2.13kg (4.70lb)
    Internal Shackle Width: 9.88cm (3.89”)
    Internal Shackle Height: 25.85cm (10.17")
    Oxford Alarm-D Pro 260 & 320
    The Alarm-D Pro 320 & Duo are the same lock, although the Duo is supplied with a cable extension.

    So as you can see above, the Alarm-D Pro 260 offers slightly less internal shackle space than the Pro 320 & Pro Duo.

    The Pro 260 is suitable for cyclists who need to lock one bike and offers more than enough space to lock your rear wheel and frame simultaneously. 

    It offered enough space for me to remove and secure my front wheel at the same time. Bear in mind the bike I trialled this with was a road bike with thin wheels, so it may or may not be possible for bikes with wider wheels & tires.

    Remaining Space Left over inside shackle after
    After securing my bike to a bike rack using the Sheldon Brown locking method, there was more than enough space left to remove and secure my front wheel.

    If you frequently ride with friends or want extra locking space for increased versatility, the Pro 320 or Pro Duo will be more suitable for you. This lock is capable secure two bike frames and their rear wheels at the same time.

    You can then use the locking extension cable to secure your front wheels in place.

    Neither of these locks were too heavy to be carried in my backpack whilst cycling, but they both come with a simple yet effective mounting system which I cover just below.

    Mounting System

    The mounting system supplied with the Alarm-D Pro range is identical to the mount supplied with the old Alarm-D series.

    No upgrade was required as the mount supplied is straightforward to use and is more than capable of holding the lock firmly in place whilst you ride.

    Both of my road bikes have thicker top tubes and down tubes. However, the adjustable plastic strap the mount uses enabled me to quickly attach the mount to the frame of my bike.

    The mount's plastic straps are tightened by two hex bolts, you'll need your own hex wrench (Allen key) for this
    Bike Down tube width measurement
    My down tube is 50mm wide and the mounting system was still able to work

    This mount is designed to work and will work with almost any bike out there. Insert the shackle through the mounting hole and secure your lock in place, and you’ll be good to go. 

    Two rubber pads sit inside the mount, which prevent it from scratching the paintwork of your bike. If your bike has thicker frame tubes, you’ll be best off removing the outer rubber pad.

    Whilst it’s probably not an intentional feature, I’ve found that the small circular cut-out on the rubber pad’s underside is just the right size to be mounted on top of the mounting hex screws. Helpful if this is the only available space you have.

    Oxford Alarm-D Pro 320 Mounted on Bike
    Alarm-D Pro 320
    Oxford Alarm-D Pro 260 Mounted on Bike
    Alarm-D Pro 260

    Quality & Maintenance

    If like me, the bikes you own are your pride and joy, you’ll be relieved to hear that the Alarm-D Pro series is equipped with a thick anti-scratch coating.

    This rubber casing encapsulates the 14mm hardened steel shackle, preventing it from ruining your paintwork. The mechanism housing also features two protective rubber sleeves, which stop the lock from being damaged by drops & knocks.

    Apart from that, the Alarm-D Pro range is manufactured using corrosive resistant materials, which will ensure you can keep using the lock for years to come.

    How to replace Oxford Alarm D batteries
    Replacing your battery the Alarm-D Pro a simple task

    Along the way, you may have to replace the long-life CR2 lithium battery once or twice. These batteries are very affordable, and replacing them only takes a minute.

    When replacing, opting for rechargeable batteries is a sustainable, cost-efficient option.

    If you regularly leave your bike locked outside, you don’t need to worry. The internal electronics these D locks use are protected by weatherproofing, ensuring the alarm continues to function despite the weather conditions.

    Locking Mechanism & Operation

    Three (coded & replaceable) keys are supplied with Alarm-D Pro locks, which operate the locking mechanism in a smooth and fluid action.

    When these locks were brand new, I found that the shackle needed a bit of encouragement for the mechanism to engage properly.

    This is an issue that is common with many new bike locks, and as I used the Pro locks, they became easier to lock.

    Oxford Alarm-D Pro Keys with key code fob
    Take a note of your key code when your lock arrives, this will allow you to get replacements cut, should you lose your spares

    Oxford recommend that you lubricate your lock once per week to ensure it stays in optimal working condition. I think this is slightly excessive and lubricate my bike locks once every month or less frequently, depending on usage.

    The 120dB alarm feature these locks use can be turned off if not required. I’ll talk you through how to operate it below.

    Oxford Alarm-D Pro - How to Operate the Alarm

    Operating the alarm is super easy and takes no time getting used to. There are no buttons or switches on the Alarm-D Pro. Its alarm is operated by twisting the key inside the locking mechanism.

    When rotating the key in the locking mechanism, you’ll hear a single or double tone.

    • A single tone means – The alarm feature is active and ready for use
    • A double tone means – The alarm feature is deactivated and will not sound

    When locking your bike, if you want the alarm to be active, make sure the double tone sounds before locking up. 

    If you hear the single tone, fully rotate the key inside the locking mechanism, and it will turn alarm surveillance on. 

    When mounting the lock to your bike, make sure you hear the double tone before locking. If you begin cycling with the alarm activated, you’ll have an interesting ride!

    If the alarm begins to sound unintentionally, insert your key and open the lock to switch the alarm off.

    Alarm-D Pro Warranty

    In line with EU regulations, Oxford offer a two-year warranty on the Alarm-D Pro range. This is a standard warranty and will keep you functioning without manufacturing defects for two years after purchase.

    When you purchase an Alarm-D Pro, make sure to register it here to activate your warranty.

    How Much Does the Alarm-D Pro Cost?

    The new Alarm-D Pro locks are marginally more expensive than their predecessors.

    But for the increased protection they offer, any of the locks from the Alarm-D Pro range are a worthy investment for cyclists who want more than just a beefy bike lock. They’re sold at a very reasonable price too [Amazon].

    If you worry about your bike at night, the 120dB alarm these locks use will alert you to any disturbances if you’re nearby. This reduces the risk of theft and gives you the peace of mind you need to lock up your bike without worrying.

    You can view the most up to date price for the Alarm-D Pro range here [Amazon]

    Best Way to Use the Alarm D Max Duo

    When locking any bicycle, it’s important to lock up in order of worth. The frame is almost always the most valuable part of your bike, so you should prioritise its security.

    The two steps below will show you the most secure and most convenient ways to lock up using the Alarm-D Pro.

    Alternatively, if you’d like to learn how to lock your bike the most secure way with any lock, read this.

    Most Convenient Locking Method

    How to lock your bike with the Oxford Alarm-D Pro Duo

    The Alarm-D Pro Duo is supplied with a handy cable extension, which makes securing your front wheel much faster than having to remove it.

    Lock your rear wheel and frame to an immovable object, lassoing your front wheel with the cable extension. Make sure to insert the shackle through the looped end of the cable before locking.

    This will hold the wheels and frame of your bike in place. With your bike locked like this, thieves are likely to choose another target. However, the cable only provides minimal security and could be cut.

    The locking solution below is more suitable for cyclists who have expensive wheelsets.

    Safest Locking Method

    This locking method takes slightly longer but provides the highest level of security for your bike’s most expensive components.

    By removing the front wheel of your bike, you’ll be able to secure your bike and both wheels to an immovable object.

    Bear in mind that the larger Alarm-D Pro 320 may be needed for this locking method, especially if you’re locking to larger objects such as lampposts or if your bike has wide wheels/tires.

    This locking method is more suitable for cyclists whose wheels can be removed with quick-release skewers.

    If you’d rather not have to constantly worry about the wheels of your bike, check out Hexlox, the clever solution to bike accessory theft.

    Included with The Alarm-D Pro

    The Alarm-D Pro comes with everything you’ll need to get started. Below are the contents included in the box.

    • Alarm-D Pro
    • 3 x Coded Replaceable Keys
    • Adjustable Mounting Bracket
    • Battery Compartment Allen key (hex key)
    • Instruction Manual

    Extras included with the Alarm-D Pro Duo:

    • Cable Extension – 1.2m (3.94′)

    How Does the Alarm-D Pro Compare to Other Bike Locks?

    OnGuard Brute – The Best Cheap Bike Lock



    If you’ve read any of my other reviews, chances are you’ll have read about the OnGuard Brute. I recommend this bike lock in most of my posts because of the incredible security you receive for your money.

    This lock is the cheapest Sold Secure Diamond rated bike lock [Amazon] on the market (apart from the OnGuard Pitbull) and offers a “bolt cutter proof” 16.8mm hardened steel quad-bolted shackle.

    If an alarm feature isn’t necessary for you, check out the latest price for the Brute here or read my detailed review.

    LINKA Bike Lock – A Seriously Smart Bike Lock



    I recently put the LINKA smart bike lock to the test and was pleasantly surprised by how well it performed.

    Whilst this smart lock doesn’t boast a Sold Secure Gold rating, it received Level 2 certification from ART (the Dutch security rating organisation) which means it’s suitable for use with bicycles.

    The LINKA also uses a loud 110dB alarm to prevent theft, whilst its Bluetooth capabilities allow it to be controlled remotely with a smartphone.

    If you’re into cutting edge tech and need a low profile lock that allows you to lock your bike anywhere, check the most up to date price here [Amazon] or have a read of my review.

    Oxford Key Replacement Scheme

    As I’ve covered, the keys supplied with the Alarm-D Pro have a unique key code printed on a small metal tag. If you were to lose the keys to your bike lock, you’d be able to use your key code to get replacement keys cut.

    The key replacement service is reasonably priced, and new keys can be requested by contacting Oxford’s customer support.

    Summary – Alarm-D Pro Duo Review

    Oxford’s efforts to revamp and improve their Alarm-D range has been successful. With their Sold Secure Gold rating and increased resistance to theft (compared to the previous models), the new Pro locks are a reliable and trustworthy range of bike locks.

    Many cyclists who have bicycle insurance are required to use a Sold Secure Gold rated bike lock, which means the Alarm-D Pro range is now a plausible option for many.

    The Improvements made by Oxford solidify this locks place as the best bike lock with alarm. If you’d like to see how it compares with the other alarmed bike locks, read this review.

    Otherwise, check out my other bike lock recommendations below.

    As always, lock it or lose it.

    Ciao for now!

    Author of This Post:
    Picture of James Grear (Lead Editor)
    James Grear (Lead Editor)

    Understanding how devastating it is to have a bike stolen, I've researched & immersed myself in the world of bicycle security since 2013.

    I then built BikeLockWiki in 2019 to share everything I'd learned with the worldwide cycling community so that cyclists can improve their bike security skills and make informed decisions when purchasing new products and services.

    Learn More about Me & BikeLockWiki here.

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