Mason 180

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World's Lightest Sold Secure Diamond U-Lock!

Unique triangular crossbar profile for best strength/weight ratio. Double deadbolt locking mechanism for protection against twist attacks. *Mounting Bracket sold separately

NOTE: The product "Mason 18CM" is an original Seatylock product. It is similar to the Mason 180, differ only by a color scheme. It is sold in other platforms.



    Customer Reviews

    Based on 16 reviews
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    J
    Jen
    surprised these are not more popular (UK)

    just ordered my second one of these from my favourite local retailer. I live in London, an area with rampant bike theft. If someone is dedicated and has an angle grinder, they will get through 99% of locks. But this 180 lock is the perfect balance of security, price and weight. With my first Seatylock 180, I was worried about size but it's just big enough to get around the rear triangle, tyre and a Sheffield cycle stand.

    R
    Régent Gravel
    Review unlocked

    Great product. U-Lock Mason 180 is very light compare to other comparable locks. My daughter loves it!

    N
    Nicole Crawford
    Worth every penny!

    This is a fantastic lock! Made well. Not to heavy but some weight is good especially with this lock you can’t go wrong. Very easy to use. I had bought another due to the size it fell short on the space it gave between the objects and my bike it was being locked to but I still use it as a secondary more piece of mind for me. I did purchase the same lock but a different model which is the mason 300 and I love that one too. The space for locking my bike to objects are even more convenient for me. I highly recommend the lock high security and I definitely feel confident in this lock and the security it provides.

    S
    Spencer Kozik
    Great lock

    Can’t beat the size and weight. This is the best U lock I’ve come across and I feel very secure leaving my bike wherever I go during the day.
    The 180 is perfect for my road bike and I’d purchase again in a heartbeat.

    C
    Claire
    Great lock

    Sturdy, very light weight. Perfect size for my hybrid bike in a large city.

    J
    Jeremy Totton
    Better than expected.

    I bought the Mason 180 as the main lock for my Trek Dual Sport bike, and on arrival was blown away by the quality of this thing. The key turns smoothly, the lock opens and shuts nicely and it isn’t near as heavy as other locks of the type. I’ve seen complaints about the zip ties that come with the mount for this but I found they worked really well (even after my dog chewed halfway through one, leaving it held on by only 1.5.

    Definitely recommend the mount too, but mounting was my only disappointment with this thing. I have a decently large frame bike and there is nowhere on my inner frame I can mount this while also having a water bottle mounted. I found most of the rest of the recommended mounting angles awkward or in the way of body motion while biking, fortunately my bike has a back rack mounted on it and I was able to mount the lock to that instead.

    Overall, great lock at a great price. Just check the measurements against your fame before buying for mounting reference!

    J
    JS
    next level

    Mason 140/180 locks are a relative joy to use. The 140 has been just enough in all situations so far with my steel-framed road bike. Rigid & grippy, no wobble on Seatylock mount, and a significant bit lighter to make these next level products to own. I do wish that it had been made more clear that (3) keys are included, as I had purchased as many spares again with the lock order and at a very high cost. Gotta make some time to follow up on that ~ No time for photos of this type either, but you get the picture -

    G
    GREGORY R DENUNZIO
    Perfect U-Lock

    Very nice lock, You can feel the quality. Just the right size, fits back wheel through the triangle to a post every time.

    W
    William Richards
    Damn good security

    Somebody can always bust your lock, but they’ll break a sweat to get to your bike

    E
    Eric Lewis

    Great size for getting the frame and wheel without much extra room

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