Argon 18 Sum
377B.2E.2
This bike is available through the Cycle to Work Scheme
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Book a sizing appointment in our bike fit studio and get the right fit.
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- Questions on size or spec? Call 01625 403803 or visit us at 48a London Road, Alderley Edge
- Sized properly: book a bike fit in our Alderley Edge studio
- Not in the shop? Supplier stock reaches us in 4–5 days, then we post it or it's ready to collect
- 30-day returns (custom builds excluded)
- ★★★★★ 150+ five-star Google reviews
All together faster. The Sum gives you an advantage on the climbs, in the sprints and on the flat, with a rider-focused design that feels both planted and responsive.
Elite Level Layup carbon is engineered to maximise aerodynamics while keeping weight low, and the Topological Compliance System gives it a smoother ride than most aero frames can match.
Highlights
- Elite Level Layup carbon frame
- Hourglass-shaped headtube and draft-deflecting fork blades
- Aero-profile downtube shaping
- D-shaped seatpost with integrated clamp
- 3D System and Topological Compliance System
- SRAM Force AXS, Shimano Ultegra Di2 and 105 Di2 builds
Sizes and fit
Available in XXS (44-46cm), XS (47-50cm), S (51-53cm), M (54-56cm), L (57-59cm) and XL (60-62cm). Each size has its own geometry under the Argon Fit System.
Colours
Smoked Nickel and British Racing Green.
Frameset
- Frame: Sum
- Fork: Sum specific
- Headset: FSA Headset NO.55R 1.5'' + 3D
Wheels and tyres
- Tyres: Vittoria Corsa N.EXT TLR 28mm
- Tyre clearance: 30c (32mm)
Cockpit and contact points
- Handlebar: FSA Energy SCR Compact
- Stem: FSA SMR-II
- Bar tape: Ciclovation LEATHER TOUCH Tornado Gloss
- Saddle: Repente Quasar
- Seatpost: Sum specific
SRAM Force AXS build
- Wheels: Scope R4
- Bottom bracket: SRAM DUB PF 86.5 Road
- Front derailleur: SRAM Force AXS E1
- Rear derailleur: SRAM Force AXS E1
- Crankset: SRAM Force AXS Powermeter 48/35
- Chain: SRAM Force 12-speed
- Cassette: SRAM XG 1270 10-33 XDR
- Brakes: SRAM Force AXS
- Rotors: SRAM Centerlock Centerline XR / F:160mm R:140mm
- Shifters: SRAM Force AXS E1
Shimano Ultegra Di2 build
- Wheels: Scope R4
- Bottom bracket: Shimano Ultegra SM-BB72
- Front derailleur: Shimano Ultegra Di2 R8150
- Rear derailleur: Shimano Ultegra Di2 R8150
- Crankset: Shimano Ultegra R8100 52/36
- Chain: Shimano Ultegra CN-M8100
- Cassette: Shimano Ultegra CS-R8100 11-30
- Brakes: Shimano Ultegra Di2 R8170
- Rotors: Shimano Ultegra RT-CL800 / F:160mm R:140mm
- Shifters: Shimano Ultegra Di2 R8170
Shimano 105 Di2 build
- Wheels: Scope S4.A
- Bottom bracket: Shimano Ultegra SM-BB72
- Front derailleur: Shimano 105 Di2 R7150
- Rear derailleur: Shimano 105 Di2 R7150
- Crankset: Shimano 105 FC-R7100 52/36
- Chain: Shimano 105, 12-speed
- Cassette: Shimano 105 CS-R7100 11-34
- Brakes: Shimano 105 Di2 R7170
- Rotors: Shimano SM-RT70 / F:160mm R:140mm
| Size | XXS (44-46) | XS (47-50) | S (51-53) | M (54-56) | L (57-59) | XL (60-62) |
|---|---|---|---|---|---|---|
| Stack (mm) | 471 | 493 | 516 | 540 | 565 | 592 |
| Reach (mm) | 375 | 382 | 389 | 397 | 405 | 414 |
| Seat tube length (mm) | 395 | 425 | 460 | 505 | 550 | 595 |
| Top tube (effective) (mm) | 503 | 520 | 538 | 557 | 578 | 600 |
| Head tube length (mm) | 69 | 85 | 101 | 126 | 152 | 180 |
| Head tube angle (°) | 71.2 | 72.1 | 72.7 | 72.7 | 72.7 | 73 |
| Seat tube angle (°) | 75 | 74.5 | 74 | 73.5 | 73 | 72.5 |
| Chainstay length (mm) | 410 | 410 | 410 | 410 | 410 | 410 |
| BB drop (mm) | 69 | 73 | 77 | 77 | 77 | 77 |
| Wheelbase (mm) | 967 | 972 | 975 | 990 | 1006 | 1020 |
| Standover (mm) | 676 | 700 | 727 | 766 | 804 | 841 |
| Head tube length (15mm 3D spacer) (mm) | 84 | 100 | 116 | 141 | 167 | 195 |
| Head tube length (25mm 3D spacer) (mm) | 94 | 110 | 126 | 151 | 177 | 205 |
| Stack (15mm 3D spacer) (mm) | 485 | 507 | 530 | 554 | 579 | 606 |
| Stack (25mm 3D spacer) (mm) | 495 | 517 | 540 | 564 | 589 | 616 |
| Reach (15mm 3D spacer) (mm) | 370 | 377 | 385 | 393 | 401 | 410 |
| Reach (25mm 3D spacer) (mm) | 367 | 374 | 382 | 390 | 398 | 407 |
Measurements from Argon 18's published geometry, converted from cm to mm. Stack, reach and head tube are shown with no 3D headset spacer; the extra rows show the taller 3D spacer options.
Free UK shipping available on all orders, excluding bikes, wheelsets and packages over 10kg in weight e.g. turbo trainers.
