The Freedom To Explore

J.ACK

Go-anywhere disc brake equipped cobble smasher

Frame & forks from £2480.00 // Complete bikes from £3850.00

The brief: To create a true four-season titanium road frame that will tackle rutted cobbles, broken and gravelled roads or ribbon-smooth asphalt with equal composure. 
The result: An all road, highly capable and versatile frame that offers the perfect balance of agility, comfort, speed and style. Perfect for exploring the road less travelled.

The J.ACK Range
J.ACK I
Shimano 105 Hydro Disc
Key Features

Shimano 105 5800 with Ultegra Level ST-RS505 hydraulic disc


ÆRA AR Disc Fork


Your choice of ÆRA wheels


Brooks Cambium C15 saddle


Hope threaded or T47  bottom bracket & integrated headset


Flat mount braking


Pro LT finishing kit


J.ACK II
Shimano Ultegra Hydro Disc
Key Features

Shimano Ultegra R8020 or
Shimano Ultegra Di2 R8070


ÆRA AR Disc Fork


Your choice of ÆRA wheels


Brooks Cambium C15 saddle


Hope threaded or T47  bottom bracket & integrated headset


Flat mount braking


Pro LT finishing kit


J.ACK III
Shimano Dura Ace Hydro Disc
Key Features

Shimano Dura-Ace R9120 or
Shimano Dura-Ace Di2 R9170


ÆRA AR Disc Fork


Your choice of ÆRA wheels


Brooks Cambium C15 saddle


Hope threaded or T47  bottom bracket & integrated headset


Flat mount braking


ENVE finishing kit


Personalised bead blasted message


BLK J.ACK
Custom paint finish frame
Key Features

Choose from Shimano 105, Ultegra or Dura Ace


ÆRA AR Disc Fork


Your choice of ÆRA wheels


Brooks Cambium C15 saddle


Hope threaded or T47  bottom bracket & integrated headset


Choice of finishing kit


Custom paint finish


Design Features

Unsightly dynamo cables are no more with our internally routed dynamo cable option.

Reliability and simplicity and are king where bottom brackets are concerned and for this reason we recommend threaded bottom bracket shells.

Gear and brake cables are routed internally to protect them from the elements and ensuring smooth shifting and braking.

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

Beautifully integrated ‘Streamline‘ head tube and/or bottom bracket that allow all cables to be hidden and protected inside the frame.

Custom geometry to ensure a bike that has been made to your measurements to the millimeter.

Run up to 38mm tyres, or 35mm tyres with mudguards.

Add even more versatility by opting for mudguard and rack mounts and open the door to winter riding in comfort or multi-day rides with a pannier for the overnight stay.

Design Your J.ACK

Just like our customers no two bikes are the same. Choose from a comprehensive list of bespoke options
STANDARD FEATURES
  • 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
  • 38mm tyre clearance
  • 35mm tyre clearance with mudguards
  • Compliant yet durable 3Al-2.5V double-butted titanium tubing
  • 6Al-4V head tube, bottom bracket and dropouts
  • 12mm Thru-axle as standard
  • Timeless bead blasted graphics
  • Elegant frame design
NO COST OPTIONS
  • 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 27.2mm or 31.6mm
  • Pavé stainless steel bottle cages bolts
COST OPTIONS
  • Bike fit plus £130
  • Custom geometry up to £350
  • ÆRA AR Dynamo Disc fork plus £65
  • Streamline head tube plus £175
  • Streamline bottom bracket plus £150
  • Personalised graphic plus £90
  • 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

J.ACK Geometry

Visit the J.ACK Frameset page for geometry details and full frame specification

Custom Options

No two frames are the same. Customise your J.ACK to be the bike you’ve always wanted

Choose from a press fit or threaded bottom bracket at no extra cost.

Customisable bead-blasted graphics. Work with our designer to create your own. Prices start from £90.

Choose between black, silver or engraved head badge designs.

QR or Thru axle? Choose to have guard or rack mounts, all at no extra cost.

Read the reviews

Have a question about this range? Want a test ride?

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

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