The Freedom To Explore

R J.ACK Frameset

A timeless titanium road frameset, available in two
distinct geometries, for the discerning rider

Frame only from £1850.00 // Frame & forks from £2270.00

Every frame is unique. Customisable options include bottom bracket type and bespoke, bead-blasted message.
Every frame shares the R J.ACK’s perfect balance of agility, comfort, speed and style.

Choose from two geometry options

Race: Our raciest fit puts the rider into a more aerodynamic position, ideal for fast sportive riding, racing, and topping Strava KoM leaderboards.

Classic: Seeking more of a café racer that’s perfectly in tune with long days in the saddle? Our R J.ACK Classic combines elegant style with a more back-friendly riding position, perfect for swift progress on longer rides.

Design Features

Specify either a press fit or threaded bottom bracket when ordering your frame.


Wider tyres minimise rolling resistance and maximise comfort, so the J.ACK is designed with clearance for tyres for up to 28mm at the front (with the Enve Carbon Fibre Road fork 2.0) and up to 32mm at the rear.


Both the gear and rear brake cables are routed through the frame. This not only maintains the exquisite elegance of the frame, but also protects cables from dirt, ensuring smooth shifting and razor-sharp braking.


For optimum steering precision, a bike needs unyielding stiffness where the head tube meets the fork. The R J.ACK is designed with a wider head tube to eradicate flex and guarantee pin-sharp steering.

R J.ACK Geometry – Race

Our R J.ACK Classic (available from January) fuses timeless design with geometry influenced by our popular J.ACK disc bike.

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
Tyres: Max width: 28mm at the front with Enve Carbon Fibre Road Fork 2.0, and 32mm at the rear
Whilst we believe the above information to be accurate there may be compatability issues with some untested combinations of tyres.
Seat post: 27.2mm
Seat clamp: 31.8mm
Front derailleur: 31.8mm, band on.
Bottom Bracket:
Threaded or press fit 30 (PF30)
68mm wide shell
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
Enve Carbon Fibre Road Fork 2.0:
Weight: 350g
Steerer Tube Length: 350mm
Rake: 43mm
Axle to Crown: 367mm
Brake: Caliper
Quick release
Max Tire Clearance: 28mm
1.125” – 1.5” tapered carbon steerer
5 Year Warranty
  • Elegant design
  • Internal cable routing
  • Choose from two geometry options
  • Electronic groupset ready on request
  • Timeless bead blasted graphics
  • Coordinated laser etched top cap
  • Optional threaded or press fit PF30 bottom bracket
  • Bespoke painting options
  • Tapered head tube
  • 28mm tyre clearance
  • Durable 3Al-2.5V titanium tubing
  • Hope seatpost clamp included

In the press


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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