distinct geometries, for the discerning rider
Every frame shares the R J.ACK’s perfect balance of agility, comfort, speed and style.
Reliability and simplicity are king where bottom brackets are concerned and for this reason we recommend threaded bottom bracket shells.
Wider tyres minimise rolling resistance and maximise comfort, so the R J.ACK is designed with clearance for tyres for up to 28mm at the front and up to 32mm at the rear.
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.
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.
S – Stack | 494.6 |
R – Reach | 366 |
HT – Head Tube Length | 105 |
HA – Head Angle | 69.5˚ |
AC – Fork Axle to Crown | 367 |
FO – Fork Offset | 43 |
TTE - Top Tube Effective | 517.2 |
TT - Top Tube Actual | 505.4 |
ST – Seat Tube Length | 472 |
SA – Seat Tube Angle | 73˚ |
CS – Chain Stay Length | 415 |
WB – Wheelbase | 980.8 |
FC – Front Centre Distance | 575.4 |
BBD – Bottom Bracket Drop | 68 |
Rear axle spacing | 130 |
Typical stem length | 80 or 90 |
Typical handlebar width | 38 or 40 |
Typical crank length | 170 |
S – Stack | 509.2 |
R – Reach | 373 |
HT – Head Tube Length | 115 |
HA – Head Angle | 71˚ |
AC – Fork Axle to Crown | 367 |
FO – Fork Offset | 43 |
TTE - Top Tube Effective | 528.7 |
TT - Top tube Actual | 515.6 |
ST – Seat Tube Length | 487 |
SA – Seat Tube Angle | 73˚ |
CS – Chain Stay Length | 415 |
WB – Wheelbase | 979.8 |
FC – Front Centre Distance | 574.4 |
BBD – Bottom Bracket Drop | 68 |
Rear axle spacing | 130 |
Typical stem length | 90 |
Typical handlebar width | 40 |
Typical crank length | 170 |
S – Stack | 526.9 |
R – Reach | 378 |
HT – Head Tube Length | 130 |
HA – Head Angle | 72˚ |
AC – Fork Axle to Crown | 367 |
FO – Fork Offset | 43 |
TTE - Top Tube Effective | 539.1 |
TT - Top Tube Actual | 525.1 |
ST – Seat Tube Length | 505 |
SA – Seat Tube Angle | 73˚ |
CS – Chain Stay Length | 415 |
WB – Wheelbase | 981.7 |
FC – Front Centre Distance | 576.3 |
BBD – Bottom Bracket Drop | 68 |
Rear axle spacing | 130 |
Typical stem length | 90 or 100 |
Typical handlebar width | 40 or 42 |
Typical crank length | 170 |
S – Stack | 538.1 |
R – Reach | 384 |
HT – Head Tube Length | 140 |
HA – Head Angle | 72.5˚ |
AC – Fork Axle to Crown | 367 |
FO – Fork Offset | 43 |
TTE - Top Tube Effective | 548.5 |
TT - Tope Tube Actual | 533.9 |
ST – Seat Tube Length | 515 |
SA – Seat Tube Angle | 73˚ |
CS – Chain Stay Length | 415 |
WB – Wheelbase | 986.7 |
FC – Front Centre Distance | 581.3 |
BBD – Bottom Bracket Drop | 68 |
Rear axle spacing | 130 |
Typical stem length | 100 |
Typical handlebar width | 42 |
Typical crank length | 172.5 |
S – Stack | 557.2 |
R – Reach | 390 |
HT – Head Tube Length | 160 |
HA – Head Angle | 72.5˚ |
AC – Fork Axle to Crown | 367 |
FO – Fork Offset | 43 |
TTE - Top Tube Effective | 560.3 |
TT - Top Tube Actual | 545.4 |
ST – Seat Tube Length | 535 |
SA – Seat Tube Angle | 73˚ |
CS – Chain Stay Length | 415 |
WB – Wheelbase | 998.7 |
FC – Front Centre Distance | 593.2 |
BBD – Bottom Bracket Drop | 68 |
Rear axle spacing | 130 |
Typical stem length | 100 |
Typical handlebar width | 42 |
Typical crank length | 172.5 |
S – Stack | 571.5 |
R – Reach | 396 |
HT – Head Tube Length | 175 |
HA – Head Angle | 72.5˚ |
AC – Fork Axle to Crown | 367 |
FO – Fork Offset | 43 |
TTE - Top Tube Effective | 570.8 |
TT - Top Tube Actual | 555.6 |
ST – Seat Tube Length | 540 |
SA – Seat Tube Angle | 73˚ |
CS – Chain Stay Length | 415 |
WB – Wheelbase | 1009.2 |
FC – Front Centre Distance | 603.7 |
BBD – Bottom Bracket Drop | 68 |
Rear axle spacing | 130 |
Typical stem length | 110 |
Typical handlebar width | 42 or 44 |
Typical crank length | 175 |
S – Stack | 581 |
R – Reach | 402 |
HT – Head Tube Length | 185 |
HA – Head Angle | 72.5˚ |
AC – Fork Axle to Crown | 367 |
FO – Fork Offset | 43 |
ST – Seat Tube Length | 550 |
SA – Seat Tube Angle | 73˚ |
CS – Chain Stay Length | 415 |
WB – Wheelbase | 1018.2 |
FC – Front Centre Distance | 612.6 |
BBD – Bottom Bracket Drop | 68 |
Rear axle spacing | 130 |
Typical stem length | 110 or 120 |
Typical handlebar width | 44 |
Typical crank length | 175 |
TTE - Top Tube Effective | 579.6 |
TT - Top Tube Actual | 564.3 |
S – Stack | 597.1 |
R – Reach | 408 |
HT – Head Tube Length | 200 |
HA – Head Angle | 73˚ |
AC – Fork Axle to Crown | 367 |
FO – Fork Offset | 43 |
TTE - Top Tube Effective | 590.6 |
TT - Top Tube Actual | 574.6 |
ST – Seat Tube Length | 580 |
SA – Seat Tube Angle | 73˚ |
CS – Chain Stay Length | 415 |
WB – Wheelbase | 1024.1 |
FC – Front Centre Distance | 618.5 |
BBD – Bottom Bracket Drop | 68 |
Rear axle spacing | 130 |
Typical stem length | 120 |
Typical handlebar width | 44 |
Typical crank length | 177.5 |
Wheels:
Rear axle: 130mm
Front axle: 100mm
Tyres: Max width: 28mm at the front with ÆRA Carbon Fibre Road Caliper Fork, and 32mm at the rear
Whilst we believe the above information to be accurate there may be compatibility issues with some untested combinations of tyres.
Seat post: 27.2mm
Seat clamp: 31.8mm
Front derailleur: 31.8mm, band on.
Bottom Bracket:
Threaded BSA or T47
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
ÆRA Carbon Fibre Road Caliper Fork:
Weight: 350g
Steerer Tube Length: 300mm
Rake: 43mm (Race) or 45mm (Classic)
Axle to Crown: 367mm
Brake: Caliper
Quick release
Max Tire Clearance: 28mm
1.125” – 1.5” tapered carbon steerer
3 Year Warranty
- Elegant design
- Internal cable routing
- Choose from two geometry options
- Electronic groupset ready on request
- Timeless bead blasted graphics
- Optional threaded BSA or T47 bottom bracket
- Bespoke painting options
- Tapered head tube
- 28mm tyre clearance
- Durable 3Al-2.5V titanium tubing
- Seatpost clamp included