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  • Finance Available0% on orders over £300

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We now offer free returns on any UK Mainland order (excluding Highlands) over £25. Most importantly, returning an item to us is super simple. Just click here or on the 'create a return' link located at the bottom of every page, and create your return in under 1 minute. You can choose from any UPS Access point close to you where you can drop off your return at a time convenient for you.

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There's a reason why our competitors spend so much time watching what we do, we believe in customer service levels beyond the norm and we're always looking for ways to improve. In late 2013 we were recognised for this by the bike industry's No.1 publication, Motorcycle News. As retailer of the year, we feel it's our duty to constantly better our offering and if you have any ideas, we'd love to hear from you!

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Mammoth Security Shackle Disc Lock

Best Seller
in Disc Locks

Hardened shackle disc lock with a double bearing lock system and reinforced cylinder plates

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Customer Reviews for Mammoth Security Shackle Disc Lock

Mammoth Security Shackle Disc Lock
November 26, 2019

Wow what a piece of kit!

Solid, easy to use and definitely one for the pannier. It's very visible and VERY sturdy!! Totally worth the money!!! Again, excellent product Sportsbikeshop!!

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Mammoth Security Shackle Disc Lock
June 25, 2019

Well priced sturdy lock

Well priced sturdy lock, easy to use and see.

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Mammoth Security Shackle Disc Lock
November 30, 2018

Can't fault it

It's a good solid lock. It's heavier than it looks, and feels sturdy. It only just fits on the front disk of my Z900RS, but that's because I hadn't measured the disk's thickness, width, or the dimensions of the holes, before I bought the lock. oops! Even in its carry pouch, with lanyard, it wedges nicely under the seat (taking the only available piece of space once the toolkit's come out - well...). I particularly like the sliding cover over the keyhole - I doubt it's watertight, though, but it'll keep the muck out. All in all, I'd recommend it (especially for the price).

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Mammoth Security Shackle Disc Lock
October 24, 2018

Mammoth by name mammoth by nature

Sturdy lock that was a lot bigger than what I expected. So much so that it wouldn't quite fit comfortably under the passenger seat of my MT 07. That said it can still be squeezed in as long as you're not fussed about having the black metal plate back in position before putting the seat back on. Reminder cable bright and colourful to stop you making a fool of yourself. All in all a good product so far.

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Mammoth Security Shackle Disc Lock
October 17, 2018

Quality disc lock

Really heavy duty disc lock, highly recommend.

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Mammoth Security Shackle Disc Lock
October 9, 2018

Solid lock

Good solid lock, a fair bit bigger than expected & a bit awkward to get over the disc.

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Mammoth Security Shackle Disc Lock
September 29, 2018

It fits....just

It doesn't fit on the front disc of my 2019 Z1000SX, but it does go around the wheel spoke so not a total loss. I am at the moment trying to store it in the seat compartment but with the tool bag and puncture repair kit but with no success. The quality of the lock however is good and should keep the crooks at bay for some time.

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Mammoth Security Shackle Disc Lock
September 24, 2018

Massive lock

Fits my ER6F front disk just and the day glow reminder, have the big chain too, good products. No room under my seat as its full already so have to carry in the backpack. Those looking for a disk lock but unsure give it a go, if not satisfied send it back.

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Mammoth Security Shackle Disc Lock
August 27, 2018

Chunky, heavy duty lock

Just about fits on my disc with a bit of jiggling. The heavy weight of this lock gives peace of mind, and the hidden shackle must make it difficult, if not impossible for thieves to cut through.

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Mammoth Security Shackle Disc Lock
July 27, 2018

It's big

It's heavy, large, very visible and Thatcham approved at a reasonable price. It does not actually fit on the front disk of my 2015 Triumph Street Triple R, but it does fit on the wheel spoke so achieves the same aim.

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Mammoth Security Shackle Disc Lock

  • Hardened steel lock body
  • Double bearing lock mechanism
  • 11mm hardened Cr-Mo steel closed U-shackle
  • Extended shackle and body for use as disc lock
  • Reinforced cylinder plates resist drilling and picking

Intended as an additional or short-term security device. Disc locks are great for use when a lock and chain cannot be used, such as on journeys. Small and light enough to store in luggage or underseat, disc locks will make it more difficult for would be thieves to wheel a bike away. Use as additional security also whenever the bike is chained. Can also be used with a chain.

Related Items

Mammoth Security

Mammoth and Thatcham rated security, utilising the best materials and components available, the Mammoth range provides security solutions for all motorcycle and scooter needs.

See all Mammoth Security products
Questions and Answers

Questions and Answers

  • To ensure I can fit it through the disc carrier what is the length between the shackle and the main body of the lock?

    September 14, 2018

    The length between the shackle and the bolt on this lock is approximately 8cm

  • Will this lock fit on 2013 Kawasaki zzr1400?  Thanks

    May 21, 2018

    Unfortunately we are not able to advise on fitment to specific bike models, apologies. The shackle is 11mm in diameter, but it does not need to go through the disc holes, it can go through the cut-outs in the disc carrier.

  • Hi, Will this lock fit my Harley Street Rod, the disk holes are only 8mm diameter?

    March 26, 2018

    The shackle is 11mm in diameter, but it does not need to go through the disc holes, it can go through the cut-outs in the disc carrier.

  • Not a question, but advice, that the Mammoth Security Shackle Disc Lock does NOT fit a Triumph Speed Triple. There is not enough room to position the lock shackle against the (rather big) disc, such that it can (not) be aligned with the main lock body and I was unable to close it, and lock it. It's a shame really, as it is a substantial lock. I ended up just using it as a big padlock!

    March 6, 2018

    Thank you very much for your feedback.

  • Can you please clarify the diameter of the pin on this lock?

    February 21, 2018

    The pin diameter is 11mm.

  • Is it thatchham 3 approved ?

    January 23, 2018

    This Mammoth security product has been evaluated against The British Insurance Industry s Criteria for Vehicle Security , using specific tests to indicate the effectiveness of the product. It is recognised as a Thatcham Approved Device Category 3 Mechanical Immobiliser. Thatcham Evaluation number: TMC3-304-1207

  • Will this lock fit a 2017 KTM Duke 390 please?

    December 11, 2017

    As the product is a universal fitment, we do not have any information on specific bike fitments. However, we can see no reason why it should not fit.

  • Will this fit the front disc on a Peugeot Speedfight 4?

    August 14, 2017

    The Mammoth disc lock will fit your Peugot - the pin of the lock will sit inside the disc, rather than through a hole in the disc itself.

  • What size chain will fit in this lock?

    February 20, 2012

    The Bike It Mammoth Shackle Disc Lock caters for chains up to approximately 16mm.

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