distinct geometries, for the discerning rider
Every frame shares the R J.ACK’s perfect balance of agility, comfort, speed and style.
Wider tyres minimise rolling resistance and maximise comfort, so the R J.ACK Disc is designed with clearance for tyres up to 28mm in Race geometry and 32mm in Classic geometry.
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.
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.
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 | 4′ 9″ – 5′ 2″
- 50cm: 156 – 164cm | 5′ 1″ – 5′ 4″
- 52cm: 162 – 170cm | 5′ 3″ – 5′ 7″
- 54cm: 168 – 178cm | 5′ 6″ – 5′ 10″
- 56cm: 174 – 184cm | 5′ 8″ – 6′ 0″
- 58cm: 180 – 188cm | 5′ 11″ – 6′ 2″
- 60cm: 186 – 194cm | 6′ 1″ – 6′ 4″
- 62cm: 192 – 200cm | 6′ 3″ – 6′ 6″
If you are unsure about which size is right for you, please don’t hesitate to get in touch.
'Race' | 'Classic' | |
---|---|---|
S – Stack | 497.4 | 509.6 |
R – Reach | 366 | 358 |
HT – Head Tube Length | 105 (Tapered) | 110 (Tapered) |
HA – Head Angle | 69.5˚ | 70.5˚ |
Fork | ÆRA Road Disc Race | ÆRA Road Disc Classic |
AC – Fork Axle to Crown | 368 | 375 |
FO – Fork Offset/Rake | 43 | 45 |
TTE - Top Tube Effective | 518.1 | 513.8 |
TT - Top Tube Actual | 505.5 | 499.6 |
ST – Seat Tube Length | 472 | 480 |
SA – Seat Tube Angle | 73˚ | 73˚ |
CS – Chain Stay Length | 415 | 415 |
WB – Wheelbase | 981.8 | 971.5 |
FC – Front Centre Distance | 576.5 | 566.2 |
BBD – Bottom Bracket Drop | 68 | 68 |
Standover Height | 718.2 | 728.5 |
Rear Axle | 142x12 | 142x12 |
Typical Stem Length | 80-90 | 80-90 |
Typical Handlebar Width | 380 or 400 | 380 or 400 |
Typical Crank Length | 165 | 165 |
Maximum Tyre Clearance | 28mm | 32mm |
Maximum Tyre Clearance With Mudguards | 25mm | 28mm |
Mudguard Lugs | Optional | Optional |
Rack Lugs | Optional | Optional |
'Race' | 'Classic' | |
---|---|---|
S – Stack | 512.1 | 520.7 |
R – Reach | 373 | 364 |
HT – Head Tube Length | 115 (Tapered) | 120 (Tapered) |
HA – Head Angle | 71˚ | 71˚ |
Fork | ÆRA Road Disc Race | ÆRA Road Disc Classic |
AC – Fork Axle to Crown | 368 | 375 |
FO – Fork Offset/Rake | 43 | 45 |
TTE - Top Tube Effective | 529.6 | 523.2 |
TT - Top Tube Actual | 515.9 | 510.4 |
ST – Seat Tube Length | 487 | 500 |
SA – Seat Tube Angle | 73˚ | 73˚ |
CS – Chain Stay Length | 415 | 415 |
WB – Wheelbase | 980.8 | 976.9 |
FC – Front Centre Distance | 575.4 | 571.5 |
BBD – Bottom Bracket Drop | 68 | 68 |
Standover Height | 732.1 | 743 |
Rear Axle | 142x12 | 142x12 |
Typical Stem Length | 90 | 90 |
Typical Handlebar Width | 400 | 400 |
Typical Crank Length | 170 | 170 |
Maximum Tyre Clearance | 28mm | 32mm |
Maximum Tyre Clearance With Mudguards | 25mm | 28mm |
Mudguard Lugs | Optional | Optional |
Rack Lugs | Optional | Optional |
'Race' | 'Classic' | |
---|---|---|
S – Stack | 529.8 | 541.4 |
R – Reach | 378 | 370 |
HT – Head Tube Length | 130 (Tapered) | 140 (Tapered) |
HA – Head Angle | 72˚ | 71.5˚ |
Fork | ÆRA Road Disc Road | ÆRA Road Disc Classic |
AC – Fork Axle to Crown | 368 | 375 |
FO – Fork Offset/Rake | 43 | 45 |
TTE - Top Tube Effective | 540 | 535.5 |
TT - Top Tube Actual | 525.5 | 521.1 |
ST – Seat Tube Length | 505 | 515 |
SA – Seat Tube Angle | 73˚ | 73˚ |
CS – Chain Stay Length | 415 | 415 |
WB – Wheelbase | 982.6 | 985.3 |
FC – Front Centre Distance | 577.3 | 579.9 |
BBD – Bottom Bracket Drop | 68 | 68 |
Standover Height | 749 | 759.6 |
Rear Axle | 142x12 | 142x12 |
Typical Stem Length | 90 or 100 | 90 or 100 |
Typical Handlebar Width | 400 or 420 | 400 or 420 |
Typical Crank Length | 170 | 170 |
Maximum Tyre Clearance | 28mm | 32mm |
Maximum Tyre Clearance With Mudguards | 25mm | 28mm |
Mudguard Lugs | Optional | Optional |
Rack Lugs | Optional | Optional |
'Race' | 'Classic' | |
---|---|---|
S – Stack | 541 | 560.4 |
R – Reach | 384 | 376 |
HT – Head Tube Length | 140 (Tapered) | 160 (Tapered) |
HA – Head Angle | 72.5˚ | 71.5˚ |
Fork | ÆRA Road Disc Race | ÆRA Road Disc Classic |
AC – Fork Axle to Crown | 368 | 375 |
FO – Fork Offset/Rake | 43 | 45 |
TTE - Top Tube Effective | 549.4 | 547.3 |
TT - Top Tube Actual | 532.1 | 532.1 |
ST – Seat Tube Length | 515 | 530 |
SA – Seat Tube Angle | 73˚ | 73˚ |
CS – Chain Stay Length | 415 | 415 |
WB – Wheelbase | 987.6 | 997.6 |
FC – Front Centre Distance | 582.2 | 592.1 |
BBD – Bottom Bracket Drop | 68 | 68 |
Standover Height | 758.9 | 775 |
Rear Axle | 142x12 | 142x12 |
Typical Stem Length | 100 | 100 |
Typical Handlebar Width | 420 | 420 |
Typical Crank Length | 172.5 | 172.5 |
Maximum Tyre Clearance | 28mm | 32mm |
Maximum Tyre Clearance With Mudguards | 25mm | 28mm |
Mudguard Lugs | Optional | Optional |
Rack Lugs | Optional | Optional |
'Race' | 'Classic' | |
---|---|---|
S – Stack | 560.1 | 569.9 |
R – Reach | 390 | 382 |
HT – Head Tube Length | 160 (Tapered) | 170 (Tapered) |
HA – Head Angle | 72.5˚ | 71.5˚ |
Fork | ÆRA Road Disc Race | ÆRA Road Disc Classic |
AC – Fork Axle to Crown | 368 | 375 |
FO – Fork Offset/Rake | 43 | 45 |
TTE - Top Tube Effective | 561.2 | 556.2 |
TT - Top Tube Actual | 546.5 | 541.9 |
ST – Seat Tube Length | 535 | 545 |
SA – Seat Tube Angle | 73˚ | 73˚ |
CS – Chain Stay Length | 415 | 415 |
WB – Wheelbase | 999.6 | 1006.8 |
FC – Front Centre Distance | 594.1 | 601.2 |
BBD – Bottom Bracket Drop | 68 | 68 |
Standover Height | 778.4 | 786.8 |
Rear Axle | 142x12 | 142x12 |
Typical Stem Length | 100 | 100 |
Typical Handlebar Width | 420 | 420 |
Typical Crank Length | 172.5 | 172.5 |
Maximum Tyre Clearance | 28mm | 32mm |
Maximum Tyre Clearance With Mudguards | 25mm | 28mm |
Mudguard Lugs | Optional | Optional |
Rack Lugs | Optional | Optional |
'Race' | 'Classic' | |
---|---|---|
S – Stack | 574.4 | 586 |
R – Reach | 396 | 388 |
HT – Head Tube Length | 175 (Tapered) | 185 (Tapered) |
HA – Head Angle | 72.5˚ | 72˚ |
Fork | ÆRA Road Disc Race | ÆRA Road Disc Classic |
AC – Fork Axle to Crown | 368 | 375 |
FO – Fork Offset/Rake | 43 | 45 |
TTE - Top Tube Effective | 571.6 | 567.2 |
TT - Top Tube Actual | 554.5 | 552.2 |
ST – Seat Tube Length | 550 | 560 |
SA – Seat Tube Angle | 73˚ | 73˚ |
CS – Chain Stay Length | 415 | 415 |
WB – Wheelbase | 1010.1 | 1013 |
FC – Front Centre Distance | 604.6 | 607.4 |
BBD – Bottom Bracket Drop | 68 | 68 |
Standover Height | 785.7 | 801.3 |
Rear Axle | 142x12 | 142x12 |
Typical Stem Length | 110 | 110 |
Typical Handlebar Width | 420 or 440 | 420 or 440 |
Typical Crank Length | 175 | 175 |
Maximum Tyre Clearance | 28mm | 32mm |
Maximum Tyre Clearance With Mudguards | 25mm | 28mm |
Mudguard Lugs | Optional | Optional |
Rack Lugs | No | Optional |
'Race' | 'Classic' | |
---|---|---|
S – Stack | 583.9 | 600.3 |
R – Reach | 402 | 394 |
HT – Head Tube Length | 185 (Straight) | 200 (Tapered) |
HA – Head Angle | 72.5 | 72˚ |
Fork | ÆRA Road Disc Race | ÆRA Road Disc Classic |
AC – Fork Axle to Crown | 368 | 375 |
FO – Fork Offset/Rake | 43 | 45 |
TTE - Top Tube Effective | 580.5 | 577.5 |
TT - Top Tube Actual | 565.2 | 562.5 |
ST – Seat Tube Length | 565 | 575 |
SA – Seat Tube Angle | 73˚ | 73˚ |
CS – Chain Stay Length | 415 | 415 |
WB – Wheelbase | 1019.1 | 1023.7 |
FC – Front Centre Distance | 613.5 | 618 |
BBD – Bottom Bracket Drop | 68 | 68 |
Standover Height | 800.4 | 815.2 |
Rear Axle | 142x12 | 142x12 |
Typical Stem Length | 110 or 120 | 110 or 120 |
Typical Handlebar Width | 440 | 440 |
Typical Crank Length | 175 | 175 |
Maximum Tyre Clearance | 28mm | 32mm |
Maximum Tyre Clearance With Mudguards | 25mm | 28mm |
Mudguard Lugs | Optional | Optional |
Rack Lugs | Optional | Optional |
'Race' | 'Classic' | |
---|---|---|
S – Stack | 600 | 611.7 |
R – Reach | 408 | 400 |
HT – Head Tube Length | 200 (Tapered) | 210 (Tapered) |
HA – Head Angle | 73˚ | 72.5˚ |
Fork | ÆRA Road Disc Race | ÆRA Road Disc Classic |
AC – Fork Axle to Crown | 368 | 375 |
FO – Fork Offset/Rake | 43 | 45 |
TTE - Top Tube Effective | 580.5 | 587 |
TT - Top Tube Actual | 576.5 | 573.2 |
ST – Seat Tube Length | 580 | 595 |
SA – Seat Tube Angle | 73˚ | 73˚ |
CS – Chain Stay Length | 415 | 415 |
WB – Wheelbase | 1025 | 1028 |
FC – Front Centre Distance | 619.4 | 622.3 |
BBD – Bottom Bracket Drop | 68 | 68 |
Standover Height | 817.8 | 830.8 |
Rear Axle | 142x12 | 142x12 |
Typical Stem Length | 120 | 120 |
Typical Handlebar Width | 440 | 440 |
Typical Crank Length | 177.5 | 177.5 |
Maximum Tyre Clearance | 28mm | 32mm |
Maximum Tyre Clearance With Mudguards | 25mm | 28mm |
Mudguard Lugs | Optional | Optional |
Rack Lugs | Optional | Optional |
All measurements in millimetres unless otherwise specified
Wheels: Rear axle: 142mm (12mm thru-axle)
Front axle: 100mm
Tyres: Max width: 32mm
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
Seat clamp: 31.8mm
Front derailleur: 31.8mm, band on.
Bottom Bracket: BSA Threaded 68mm wide shell
Brakes: Recommended rotor size rear: 160mm
Disc brake caliper mount rear: Flat mount
Features:
- 12mm Thru-axle as standard
- Elegant design
- Internal cable routing
- Choose from two geometry options
- Electronic groupset ready on request
- Timeless bead blasted graphics
- Threaded bottom bracket
- Bespoke painting options
- Available in brushed or Pavé finish
- Tapered head tube
- Up to 32mm tyre clearance
- Durable 3Al-2.5V titanium tubing
- Seatpost clamp included
‘RACE’
ÆRA Road Disc Fork:
Rake: 43mm
Axle to crown: 368mm
12mm Thru-axle – 100mm spacing
Max tire clearance: 32mm
1.125” – 1.5” carbon steerer
Crown race diameter: 1.5″
Internal cable routing
Available with or without mudguard mounts
ÆRA Thru-axle supplied
160mm rotor
Headtube/headset:
1.125” – 1.5”
Headset bearings: Hope Technology, integral
Top cup diameter: 44mm
Top cup stack height: 8.6mm (including 3 shims)
Bottom cup diameter: 56mm
Bottom cup stack height: 5.8mm (including crown race)
‘CLASSIC’
ÆRA Road Disc Fork:
Rake: 45mm
Axle to crown: 375mm
12mm E-Thru-axle dropouts: 100mm spacing
Max tire clearance: 30mm
1.125” – 1.5” tapered carbon steerer
Crown race diameter: 1.5″
Internal cable routing
Available with or without mudguard mounts
ÆRA Thru-axle included
160mm rotor
Headtube/headset:
1.125” – 1.5”
Headset bearings: Hope Technology, integral
Top cup diameter: 44mm
Top cup stack height: 8.6mm (including 3 shims)
Bottom cup diameter: 56mm
Bottom cup stack height: 5.8mm (including crown race)