The Freedom To Explore

J.ACK Frameset

A truly customisable four-season titanium road frameset

Frame & forks from £3650.00 // Complete bikes from £5785.00

Price includes Streamline headtube and bottom bracket, Hope headset, ÆRA bottom bracket, ÆRA seatpost clamp, ÆRA Thru-axles and rear mech hanger #5. 

Just like our customers no two bikes are the same. Choose from a variety of bespoke features including rack and/or mudguard mounts, 3rd bottle cage mounts and internally routed front and rear dynamo light cables, to personalised bead blasted graphics. Create your own versatile frame that offers the perfect balance of agility, comfort, speed and style. Perfect for exploring the road less travelled.

Our Inspiration
One bike to rule them all. This is our motivation to create the J.ACK.

OUR inspiration for the J.ACK comes from the cyclists of yesteryear, from the 1920’s, 30’s and 40’s who would have had the freedom to roam the roads and tracks to discover new areas and landscapes that were otherwise unreachable.

The spirit of cycling remains for us very much the same as it was back then, with the freedom to explore uncharted territory being the driving force behind our first frame. We also believe that the road less travelled is more interesting, even if it has more potholes, bumps and stones along the way. Not every ride can be a voyage of discovery but we believe the journey is always more important than the destination (unless that destination is a coffee stop!)

We’ve also taken inspiration from the toughest one day road races such as Strade Bianche, Paris-Roubaix and Tour of Flanders, each a classic that

fortifies the reputations of the hard men and women of professional cycling.

The rough and testing road surfaces epitomise the beginnings of the sport of road racing, and remain the most exciting events to watch and ride.

Our philosophy is to fuse elegant design with modern engineering to provide a highly capable and versatile frame that can tackle pavement, paths or pavé. If you are going to embrace the imperfect, lesser-travelled road to discover new places and scenery, then isn’t it time you added a touch of style, elegance and comfort to iron out the bumps along the way?

That’s why the J.ACK offers the perfect balance of comfort, agility, speed and style, yet ticks those practical boxes too by offering powerful disc braking, clearance for tyres up to 38mm wide and allowing you to opt for mudguard and rack mounts.

Design Features
Unsightly dynamo cables are no more with our internally routed dynamo cable option. Up front the dynamo cables run inside the ÆRA Dynamo Disc fork and for the rear light inside the frame for an integrated setup that takes nothing away from the clean and elegant lines of the frame.

Reliability and simplicity are king where bottom brackets are concerned and for this reason we recommend threaded bottom bracket shells. Our preference is the most common English (BSA) threaded bottom bracket design being super reliable and very easy to service and maintain. We also offer alternative designs such as the oversize T47 threaded bottom bracket shell.

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 flat mount rear disc brake 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.

These help smooth out rough sections of road.
Run up to 38mm tyres, perfect for the classics, 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.

Design Your J.ACK
  • Streamline head tube
  • Streamline bottom bracket
  • Threaded BSA (English) or T47 bottom bracket, other options available on request.
  • Cable routing specific to your groupset
  • Internal brake and gear cable routing
  • Tapered head tube
  • Hope integrated headset
  • ÆRA bottom bracket
  • ÆRA seatpost clamp
  • 38mm tyre clearance
  • 35mm tyre clearance with mudguards
  • Compliant yet durable 3Al-2.5V titanium tubing
  • 6Al-4V head tube, bottom bracket and dropouts
  • 12mm Thru-axle as standard
  • Timeless bead blasted graphics
  • Classics ready
  • Elegant frame design
  • Rack and or mudguard mounts
  • 3rd bottle cage mount
  • Three head badge designs
  • Internal dynamo cable routing
  • Handlebar width
  • Crank arm length
  • Chainset ratio
  • Stem length
  • Cassette ratio
  • Seatpost diameter 31.8mm or 34.9mm
  • Pavé stainless steel bottle cages bolts
  • Bike fit with bespoke geometry from £350
  • ÆRA AR Dynamo Disc fork plus £65
  • Personalised graphic plus £180
  • Pavé bead blasted frame finish plus £295
  • Bespoke Painting options from £600
  • Additional lugs for strapless frame luggage up to £195
  • Pavé titanium bottle cage bolts £5 each
  • Titanium bottle cages plus £40 each


Size Guide & Technical Information
Frame sizes can vary from one manufacturer to another and this means that a 56cm frame from one brand is unlikely to be the same as a 56cm from another.


The guide below is a good starting point for working out which frame size is right for you based on height but we would also recommend looking at the stack and reach figures on our geometry table.



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
For sizing advice please contact us via email at [email protected] or call us on 01572 503572 and we can help you choose the right size frame and bike.
If you are able to visit us we would highly recommend a bike fit at our showroom with our talented bike fit expert.
We also offer bespoke geometry frames and have created custom geometries as well as a wide range of custom sizes ranging from 44cm up to 64cm.

Rear axle:  142mm (12mm thru-axle)
Front axle: 100mm

Max width: 38mm
Max width with mudguards: 35mm
Whilst we believe the above information to be accurate there may be compatibility issues with some untested combinations of rims and tyres.

Bottom Bracket: Threaded English BSA or T47
– 68mm wide shell

Seat post: 27.2mm or 31.6mm

Seat clamp: 31.8mm or 34.9mm

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

Recommended rotor size rear: 160mm
Rear disc brake caliper mount: Flat mount

Tapered headtube/headset:
1.125” – 1.5”
Headset bearings – integrated
Top integrated bearing seat diameter – 42mm
Bottom integrated bearing seat diameter – 52mm


ÆRA AR Disc Fork

  • Also available with internal dynamo cable routing.
  • 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.

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