Argon 18 Sum Shimano Ultegra Di2

Name: Argon 18 Sum Shimano Ultegra Di2
Brand: Argon 18

2026 RoadRace Manufacturer page

Last known price: $6,250

Prices shown first for United States
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 36–52t / 11–30t
Gear range: 394%
Frame: Carbon
Brakes: Hydraulic disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

12 of 18 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

SUM Not identified

Suspension

1 part

Fork

SUM specific Not identified

Drivetrain

7 parts

Brakes

2 parts

Wheels and tires

2 parts

Cockpit and contact points

5 parts

Handlebar

Ciclovation LEATHER TOUCH Tornado Gloss Not identified
Headset
- FSA
Saddle

Repente Quasar Not identified
Seatpost

SUM specific Not identified
Stem
- FSA

Sizes and geometry

6 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size SM

Table

Reach 389mm

Stack 516mm

Wheelbase 975mm

Head angle 72.7°

Seat angle 74.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	375	382	389	397	405	414
Stackmm	471	493	516	540	565	592
Top tube lengthmm	503	520	538	557	578	600
Seat tube lengthmm	395	425	460	505	550	595
Head tube lengthmm	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 lengthmm	410	410	410	410	410	410
Wheelbasemm	967	972	975	990	1006	1020
Front centermm	567	573	577	592	608	622
Bottom bracket dropmm	69	73	77	77	77	77
Bottom bracket heightmm	267	263	259	259	259	259
Standover heightmm	676	700	727	766	804	841
Fork rakemm	48	48	44	44	44	44
Trailmm	64	58	59	59	59	57
Stack/reach ratio	1.26	1.29	1.33	1.36	1.40	1.43

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Carbon
Fork material: Carbon

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 36
Largest chainring: 52
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 30
Lowest gear: 34.8 in
Highest gear: 137.1 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Electronic

Additional specifications

Tire clearance: Maximum tire width: 30c
Tire width: 28c
Wheel material: Carbon
Wheel size: 700c

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

34.8 gear inches

This value is above the central range for this class.

Cohort: Road / Race Model year: 2026
Sample: 719 bicycles with this information
Coverage: 78.6% of the class

Highest gear

137.1 gear inches

This value is within the central range for this class.

Cohort: Road / Race Model year: 2026
Sample: 719 bicycles with this information
Coverage: 78.6% of the class

Shifting

Electronic

631 of 912 bicycles with this information use electronic shifting.

Cohort: Road / Race Model year: 2026
Sample: 912 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 13.3 km/h
Highest gear: 52.5 km/h

Total gear range 394%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 34.8–137.1 gear inches
Class reference (p10–p90): 27.4–139.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Race Model year: 2026
Lowest gear: 719 bicycles with this information, 78.6% of the class
Highest gear: 719 bicycles with this information, 78.6% of the class

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2026 builds
Specification	This bicycle Argon 18 Sum Shimano Ultegra Di2	Argon 18 Sum Pro Shimano Dura-Ace Di2	Argon 18 Sum Pro Shimano Ultegra Di2	Argon 18 Sum Pro SRAM Force AXS	Argon 18 Sum Pro SRAM Red AXS	Argon 18 Sum Shimano 105 Di2
Drivetrain
Smallest chainring	36	36	36	35	35	36
Largest chainring	52	52	52	48	48	52
Smallest sprocket	11	11	11	10	10	11
Largest sprocket	30	30	30	33	33	34
Lowest gear	34.8 in	34.8 in	34.8 in	30.8 in	30.8 in	30.7 in
Highest gear	137.1 in	137.1 in	137.1 in	139.2 in	139.2 in	137.1 in
Other specifications
Bottom bracket standard	Not informed	BB86/BB92	BB86/BB92	BB86/BB92	BB86/BB92	Not informed
Power meter	Not informed	Not informed	Not informed	SRAM Force AXS Powermeter 48/35Additional specification: Model display: Force AXSAdditional specification: Model id: force-axs	SRAM RED AXS Powermeter 48/35Additional specification: Model display: Red AXSAdditional specification: Model id: red-axs	Not informed