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Argon 18 Sum vs Argon 18 Sum Pro

Argon 18 Sum 105 Di2, side view

Argon 18

Sum

Argon 18 Sum Pro Ultegra Di2, side view

Argon 18

Sum Pro

High endAeroCarbon700c2026
Top of the rangeAeroCarbon700c2026

Two builds of the Argon 18 Sum line: 9 differences, mostly in the components.

Argon 18 Sum 105 Di2, side viewArgon 18Argon 18 Sum
Argon 18 Sum Pro Ultegra Di2, side viewArgon 18Argon 18 Sum Pro

At a glance

  • Argon 18 Sum Pro has the higher-range groupset: Shimano Ultegra Di2, against Shimano 105 Di2.
  • Argon 18 Sum has the shorter lowest gear: 12 km/h at 90 rpm, against 14 km/h.
Key specs4 differences
Model yearSame for all 2026 2026
FrameSame for all Carbon
As printed

optimize frame topology and carbon layup

 Carbon
As printed

optimize frame topology and carbon layup

Wheelset 700c · Scope S4.A 700c · DT Swiss ARC1400 Dicut Wheelset
DrivetrainSame for all 2×12 2×12
Groupset Shimano 105 Di2
As printed

Rear Derailleur: Shimano 105 Di2 R7150

 Shimano Ultegra Di2 Higher range
As printed

Rear Derailleur: Shimano Ultegra Di2 R8150

Brake model Shimano 105 Di2 R7170 Shimano Ultegra Di2 R8170 Higher range
Seatpost SUM specific SUM specific (included with frameset)

Prices

Each model's retailers, delivered to your country, and their prices over time.

Argon 18 Sum

Argon 18 Sum

Argon 18 Sum Pro

Argon 18 Sum Pro

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Character

  • Sum · Road bike average gearing, rather high equipment.
  • Sum Pro · Road bike average gearing, very high equipment.

Gearing

Speed in the lowest and the highest gear at 90 rpm: lower on the left climbs easier, higher on the right goes faster.

  • Argon 18 Sum12 km/h - 54 km/h
  • Argon 18 Sum Pro14 km/h - 54 km/h
Easiest gear (climbing)Hardest gear (descending)
Argon 18 SumArgon 18 Sum Pro

Components and specs

Every spec line by line; the higher range of a component is marked. The technical groups are folded.

Ride type
Ride typeSame for all Aero
As printed

Best Lightweight Aero Road Bike

 Aero
As printed

Pro Lightweight Aero Race Bike

Frame and fork1 difference
Max tyre clearanceSame for all 32 mm 32 mm
Bottom bracket SRAM DUB PF 86.5 Road CeramicSpeed BB86 Shimano Coated
Cable routingSame for all Fully integrated
As printed

Integrated Cables: Yes

 Fully integrated
As printed

Integrated Cables: Yes

Drivetrain3 differences
Groupset brandSame for all Shimano
As printed

Shimano 105 Di2 R7150

 Shimano
As printed

Shimano Ultegra Di2 R8150

ShiftingSame for all Electronic, wired
As printed

Shifters: Shimano 105 Di2 R7150

 Electronic, wired
As printed

Shifters: Shimano Ultegra Di2 R8170

ChainringsSame for all 2 °Value not published by the brand 2 °Value not published by the brand
Gears at the backSame for all 12 °Value not published by the brand 12 °Value not published by the brand
Chainring teeth Shimano 105 FC-R7100 52/36 Shimano Ultegra R8100 52/36 Higher range
Cassette Shimano 105 CS-R7100 11-34 Shimano Ultegra CS-R8100 11-30 Higher range
Rear derailleur Shimano 105 Di2 R7150 °Value not published by the brand Shimano Ultegra Di2 R8150 °Value not published by the brandHigher range
Shifters–Not given Shimano Ultegra Di2 R8170 °Value not published by the brand
Brakes
BrakesSame for all Hydraulic disc °Value not published by the brand
As printed

Shimano 105 Disque hydraulique

 Hydraulic disc °Value not published by the brand
As printed

Shimano Ultegra Disque hydraulique

Front rotorSame for all 160 mm 160 mm
Rear rotorSame for all 140 mm 140 mm
Wheels and tyres1 difference
Wheel sizeSame for all 700c / 29" °Value not published by the brand 700c / 29" °Value not published by the brand
RimsSame for all Carbon °Value not published by the brand Carbon °Value not published by the brand
Tyres Vittoria Corsa N.EXT TLR 28mm Vittoria Corsa Pro TLR 28c
Tyre width fittedSame for all 28 mm 28 mm
Cockpit and seatpost1 difference
HandlebarSame for all Ciclovation LEATHER TOUCH Tornado Gloss °Value not published by the brand Ciclovation LEATHER TOUCH Tornado Gloss °Value not published by the brand
Stem FSA SMR-II °Value not published by the brand–Not given
Seatpost model SUM specific °Value not published by the brand SUM specific (included with frameset) °Value not published by the brand

° Value not published by the brand

Where to buy them

Frequently asked questions

What groupset do Argon 18 Sum and Argon 18 Sum Pro come with?

Argon 18 Sum: Shimano 105 Di2. Argon 18 Sum Pro: Shimano Ultegra Di2.

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