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J.Laverack updates J.ACK titanium four-season bike with upgradable parts for concealing cables

Dynamo routing for front and rear lights can all now be hidden by carbon components

Bespoke British bike brand J.Laverack has refined its J.ACK all-road titanium bike with upgraded parts including carbon components for concealing dynamo set-ups.

2021 J.Laverack J.ACK side

The J.ACK is J.Laverack’s four-season bike that’s made-to-measure and designed to be capable of riding over Britain’s roughest roads. It can accommodate 38mm without mudguards and 35mm with.

2021 J.Laverack J.ACK tyre

“With the J.Laverack R J.ACK it provides a nice balance between stiffness and compliance,” David Arthur said when he reviewed the bike back in 2018. “It has the necessary stiffness to ensure direct handling and responsiveness for energetic and pacy riding, yet is composed and compliant over the rough roads that are a regular feature around most of the UK.”

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J.Laverack’s Streamline tapered head tube and threaded bottom bracket, which integrates the brake and gear cables inside the frame, is now included as an optional upgrade. This design protects the cables from water, mud and grit, while also giving the bike a clean finish.

2021 J.Laverack J.ACK front

For bikepackers and commuters, a carbon fork and seatpost designed by J.Laverack’s in-house components builder ÆRA Components, can be added to hide dynamo cables that power front and rear lights.

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As with all the brand’s bespoke bikes, the J.ACK is made-to-measure following a bike fit to ensure the frame geometry meets the personal requirements for each rider. This bike fitting assessment takes place in J.Laverack’s studio in Oakham, Rutland.

“This Savile Row approach means all tube lengths and angles can be fine-tuned to maximise the performance and comfort of every individual cyclist,” says J.Laverack.

The bottom bracket is also now engraved with J.Laverack’s mantra, ‘The Freedom to Explore’.

You have the choice between a hand brushed, pavé or painted frame finish, and you can further personalise the frame with hand-finished graphics.

2021 J.Laverack J.ACK  tyre 2

Practical options include discreet mounts for mudguards, a third bottle cage, pannier rack or top tube bag.

Bespoke and standard geometry frames are available from 44cm to 64cm.

Price wise, J.ACK framesets start at £2,775, while complete bikes begin at £4,145. You can book a test ride at

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Richard D | 2 years ago

I use that Aera fork on my Vaaru, in order to internally route the brake hose, dynamo wire to the front light AND dynamo wire to the top cap (where I have a USB charger).  It's a very tidy bit of kit.

DaveBJones | 2 years ago

Lovely looking bikes but you will need to be very patient as I have been waiting for my GRiT frameset for 12 months and it still hasn't arrived.

mattsccm | 2 years ago

Lovely bike but that rear mudguard mount is a bit scruffy. I have a bike with a threaded sleve instead so from the angle that this pic is taken nothing would be seen. Save a few mm of mud clearance as well. 

Sriracha | 2 years ago

Keep seeing pictures showing the stem clamped around the very end of the (carbon) steerer. I had been given to understand this was a bad idea owing to the upper clamp forces bearing upon the open end of the steerer, causing it to distort leading possibly to failure.

Am I out of date?

Secret_squirrel replied to Sriracha | 2 years ago

Sriracha wrote:

Am I out of date?

Wisdom of crowds (the internet) suggests that it was merely good practise / ultra paranoid advice from US firms frightened of being sued.

Sriracha replied to Secret_squirrel | 2 years ago

You'll have the wingman on your case with some advise soonish...  3

EK Spinner replied to Sriracha | 2 years ago

I am with you Sriracha.

To me the purpose of the top spacer is two fold, firstly as Secret_squirrel says, to get the clamping forces away from the end of the tube, It is also there to assist in the assembly as it is important that the top of the spacer stack is above the top of the steerer tube before the top cap is fitted. This way there is the ability to load the bearings in the headset with the top cap before tightening the stem clamp.

Nick T replied to Sriracha | 2 years ago

Depends on the design of the stem clamps along with the shape/type/quality of the bung inside

reippuert replied to Sriracha | 2 years ago

Ive done it on the same fork since 2006 - A RealDesign HP Signature (Merlin/Lightspeed). It depends on the fork and the compression bolt.

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