The Jiglock system makes bikes completely unrideable once the owner removes a crucial bolt


Bike thieves could be thwarted by a British invention that makes a stolen bicycle utterly impossible to ride.

Put simply, after securing it to an immovable object, the owner takes a small but crucial part of their bike away with them. It’s a bolt that slots into the headtube, through a hole hidden by the badge.

When the owner uses a special key to remove the bolt, it separates the steering tube from the forks so the handlebars flop around and the bike can’t be steered.

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“You can lock your bike to anything but if someone breaks your lock they’ve got a fully functioning bike. I wanted something that easily makes a bike useless to a thief,” says Jeff Rutland, the inventor.

“My Goldhawk bike can’t be ridden unless you have the key to the special Jiglok.”

To make the bike ridable, the key screws the Jiglok bolt through the head tube to join together the two separate parts of the steering tube. When the key is removed, the bolt sits completely inside the head tube and the swivelling Goldhawk head badge rotates into place to cover it up.

The key looks like a hex spanner but it has a special clover-style flange that Rutland says can be made in millions of unique shapes so only one will fit each lock.

“I had the idea of making a locking part that is integral to the bike,” says Rutland. “Before I hit on this solution I tried lots of different ways. I’ve got a frame in my workshop that has been cut and welded so many times.”

The separable steering tube has been engineered to handle all the vertical stresses but the bolt handles all the rotational forces. “So, if a thief tries to pack the hole with something else to make the steering work, it will shear under the stress,” says Rutland.

>>> Watch: 360 video of cycling through London

Rutland worked as an engineer and design director in the oil industry and when his company was bought out, he was able to dedicate his time to solving the problems of bike thefts.

“All of the design work has been completed and we have finished prototypes with Reynolds frames,” he tells Cycling Weekly.

“Prices aren’t yet firm but I expect the frameset to sell for £750. We can start making them with three weeks’ notice.”

Max Glaskin is an award-winning freelance journalist who tweets about cycling and science as @CyclingScience1.

He is the author of Cycling Science (published by Frances Lincoln UK, Chicago University Press USA, and seven other languages).

  • Goldhawk Bikes

    Hi Mark. It’s engineered so that neither wear out and designed to be serviceable. Cyclic testing is in the tens of thousands and road testing is approaching 3000 miles with no issues.

  • Mark in Wales

    Thank you for the clarification. Presuming then, since the bike frame is essentially the ‘barrel’, i.e. the recipient/housing of the structural ‘key’, you have engineered your product such that the ‘key’ will wear out before the frame – making the Spare a good idea. I am interested to know how many cyclic function tests has the product been subjected to in order to demonstrate this?

  • Goldhawk Bikes

    Hi Mark. It has no small parts or barrel to wear out. The removable key piece IS the lock and is a robust and structural item Should anything happen to it (damage/loss etc), you have a spare AND as the registered owner, you can get a new one which of course will only fit your bike.

  • Mark in Wales

    An interesting concept. A system integral to the bike frame. A complex key with millions of possible combinations. If/when the lock barrel wears out, then one presumes you have a non-functioning lock integral to your bike, and potentially an unrideable bike. What is the repairability of this £750 security solution?

  • Simon Clarke

    My favourite place for introdcuing weakness to a tube is in the one that directly links the controls of my bike with everything else.

  • Michael

    “I wanted something that easily makes a bike useless”

    I think Halfords have the patent.

  • Antonio

    A good idea but there are still similar limitations to now and the likely cost to existing bike owners could be too high.

    The solution is probably great for the casual or commuting bike user as an extended deterrent to prevent the opportunistic petty thief who might normally ride the bike away however not the professional organised ones. They would still be able to get through the lock and load the bike on to the back of a van. They might reconsider some bikes with this device fitted if the components aren’t worth very much and couldn’t be reused on other bikes. Those with more expensive bikes may still see theirs stolen and so probably wouldn’t benefit from this solution. Saying that I’m not sure how many people with expensive bikes would actually leave them locked in public.

    Also, do existing bike owners need to buy new frames or get them altered? I guess this solution would apply to new bikes sold in the future.

    It’s a clever idea nonetheless and I’m sure low to mid range bike manufacturers would be interested but they would need to consider their targeting strategy carefully.

  • Goldhawk Bikes

    Apologies if this comment gets posted more than once. IT issues I’m afraid….

    The beauty of Jiglok is that not only is the bike disabled, it stays that way. If your bike was taken, it’s not as simple as replacing a bolt or skewer. You’d need the unique key and without it, the bike is permanently useless. Visit to goldhawkbikes-com for more info

  • Alex

    I take my saddle with me. S’pose I could loosen the stem clamp that clamps to the steerer and the bolt in the cap so if some one tried to ride my bike with these loosened and no saddle then they would be on the floor in seconds. Ha-ha!

  • LMV1

    If I have to go in for a coffee during a ride, I take the rear wheel skewer off. Similar result.