The Freedom To Explore

BLK J.ACK Frameset

The strikingly seductive four-season titanium road frameset

Frameset from £3380.00 // Complete bikes from £5045.00

Designed, hand built and finished by perfectionists, the J.Laverack BLK J.ACK has an unforgettable presence. It has more of the luxury of its versatile sibling, draped in the finest of paint finishes.

Our Inspiration
Perfection is our benchmark.

AT the heart of the luxurious BLK J.ACK lays our highly acclaimed J.ACK frameset. The hand crafted four season all road 3Al-2.5 titanium frame features a double butted front triangle, tapered head tube, internal cable routing, choice of bottom bracket, curvaceous chain stays and Gryphon head badge.

The BLK J.ACK offers the perfect balance of considered sophistication and all-road capability. With clearance for 38mm tires at the rear, and even wider at the front, it offers more than just dazzling good looks.

Each frame benefits from the J.Laverack bespoke process, allowing you to choose from various frame options to create a truly unique bicycle.

Design Features
  • Elegant design
  • Internal cable routing
  • Electronic groupset ready on request
  • Timeless bead blasted graphics
  • Optional rack and mudguard mounts
  • Optional threaded or press fit PF30 bottom bracket
  • Bespoke Painting options
  • Tapered head tube
  • 35mm tyre clearance
  • 32mm tyre clearance with mudguards
  • Durable 3Al-2.5V titanium tubing
  • Optional quick release or thru axle dropouts
  • Hope seatpost clamp included
  • Classics ready

The larger bottom bracket shell increases the frame stiffness in this vital area as well as allowing for larger 30mm diameter aluminium crank spindles that are stiffer and lighter than their 24mm counterparts. Available in either press fit or threaded.


Both gear and the rear brake cables are routed through the frame. Aside from being aesthetically more pleasing, routing cables internally protects them from dirt ensuring smooth shifting and braking for longer.


A wider head tube where the fork meets the frame increases the stiffness in that area, reducing flex and improving steering precision.


The rear disc brake is mount is positioned on the chain stay, using the structural strength of the frame (the triangle that is made up of the seat stay, chain stay and seat post) to offer optimum braking performance. Available as post mount or flat mount.

These help smooth out rough sections of road.
Run up to 38mm tyres, perfect for the classics, for increased traction and comfort over rough terrain.
Add even more versatility by opting for mudguard and rack eyelets and open the door to winter riding in comfort or multi-day rides with a pannier for the overnight stay.


Size Guide & Technical Information
We’re on hand to help you choose the right size frame. We have access to thousands of stack and reach figures, so by way of comparison to your current bike we can confidently recommend the correct size for you.


As a guide, we’d suggest:


  • 48cm: 152-158cm
  • 50cm: 156-164cm
  • 52cm: 162-170cm
  • 54cm: 168-178cm
  • 56cm: 174-184cm
  • 58cm: 180-188cm
  • 60cm: 186-194cm
  • 62cm: 192-200cm


If you are unsure about which size is right for you, please don’t hesitate to get in touch.


Rear axle: 135mm or 142mm (12mm thru-axle)
Front axle: 100mm
Max width: 38mm
Whilst we believe the above information to be accurate there may be compatibility issues with some untested combinations of rims and tyres.

Seat post: 27.2mm or 31.6mm

Seat clamp: 31.8mm or 34.9mm

Front derailleur: 31.8mm or 34.9mm, band on.

Bottom Bracket: Threaded or Press Fit 30 (PF30)
– 68mm wide shell

Recommended rotor size rear: 160mm
Disc brake calliper mount rear: Flat mount or post mount

Tapered headtube/headset:
1.125” – 1.5”
Headset bearings – integral
Top integral cup diameter – 44mm
Top integral cup stack height – 8mm (including 3 shims)
Bottom integral cup diameter – 56mm
Bottom integral cup stack height – 6mm

J.Laverack Full Carbon Fork
Internal cable routing
Available with or without mudguard mounts
Suitable for 700C x 23-38mm tyres & 650b – up to 40mm tyres.
Designed for Flat mount disc brakes. Will also work with post mount disc brakes.
12mm E-Thru Axle Dropouts – 100mm spacing
Shimano E-Thru Axle Lever included
140 or 160mm rotor
1.125” – 1.5” Tapered carbon steerer S.H.I.S. – Clamp 28.6 – Race 39.8
2 year warranty


The word that best encapsulates the essential qualities of top riders and flawless bike frames is toughness. Aside from its unique aesthetics, no other frame material is as resilient nor as tough as titanium.

Titanium offers a great balance of properties that make it the perfect material for bicycle frames. It’s lightweight, durable and can withstand a lifetime of use whilst remaining corrosion free.

Large tube diameters allow titanium to be stiff where needed, yet the metal is naturally very good at delivering a smoother ride, especially over rough sections of road, so it’s perfect for long days in the saddle.

We use 3Al-2.5V titanium to build our frames, following the aerospace industry lead of adding 3% aluminium and 2.5% vanadium to the titanium to create the optimum performing material.

Aside from the material and ride benefits we just love the way titanium looks. J.Laverack frames aim to forge form and function to bring an unrivalled quality of ride and style to those that want more from their frame.

Have a question about this frameset?

Feel free to contact us if you have any questions at all, we’d love to hear from you.

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