Sum Pro

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Meet the best of the best: aero to match the Nitrogen, pure road performance to match the Gallium Pro, with race-ready handling and premium ride quality. The all-new Sum Pro features our most advanced layup and technologies to get you to the front of the group and keep you there, through the climbs, the corners, and the sprints.

Build options:
SRAM Force eTap AXS $8,900
SRAM Rival eTap AXS $6,600
Frameset $4,400
More details
Color: Crystal Black Gloss

All images on this page are used for illustrative purposes only. Actual bike specifications may vary depending on country and assembly options available. Please refer to the Features and Configurations section below for options available in your region.

All Together Faster

Quiver-killer? You want more than that. From the climbs to the crits, you’ll accept no compromises in aero performance, lightweight advantage, and flat-out, bunch sprint handling. CFD analysis shows the Sum Pro's aero performance as equivalent to the all-aero Nitrogen and 9% faster than the Gallium Pro Disc. A lightweight layup is complemented by a minimalist candy clearcoat directly over the carbon. Design details like dropped seatstays and an indented seattube assure compliance in all the right places to keep you rooted in the saddle. An updated size range reflects our knowledge of rider fit, providing the best handling and positioning across all sizes.

Ideal for

Light, fast and designed to keep you on the road all day, the all-new Sum Pro is your bike for the classics, the crits, the climbs… and any challenge you find in between.

Core Technologies

Argon Fit System

Argon Fit System is designed to provide riders of all sizes with consistent performance and optimal positioning.

Road Race Geometry

Our road race geometry is designed around the razor-sharp reflexes and precision handling required for racers of all levels.

Pro Level Layup

We leave no room for compromise when we build bikes for the most demanding and passionate cyclists.

Topological Compliance System

To achieve the optimal balance of comfort and performance for our endurance line, we needed geometry uniquely aligned with the demands of long-distance riding and racing. In conjunction with the best geometry, we also needed to optimise frame topology and carbon layup.

3D

Argon 18’s proprietary 3D System is an integrated solution that extends the headtube for more positioning options.

Features & Configurations

Max tire size

30c (32mm)

Max rim size

35mm

Fork Length (Axle-to-crown)

37.4cm

Fork Rake

XXS to XS: 4.8cm

S to XL: 4.4cm

BB standard

BB86

Hourglass-shaped headtube

Provides aero efficiency with maximum stiffness

Profiled fork legs

Deflect air away from the downtube for maximum aero advantage

Configuration
MSRP
Colorway
Frame
Fork
Seatpost
Headset
BB
(Bottom bracket)
Front derailleur
Rear derailleur
Crankset
See crankset measurements
Cassette
Chain
Wheelset
Tires
Brakes
Rotors
Brake levers
Shifters
Handlebar
See handlebar measurements
Stem
See stem measurements
Bar Tape
Saddle
SRAM Force eTap AXS
$8,900
Crystal Black Gloss
SUM Pro
SUM Pro specific
SUM specific (included with frameset)
FSA ACR NO.55R 1.5''
SRAM DUB PF 86.5
SRAM Force eTAP AXS
SRAM Force eTAP AXS (MAX 33T)
SRAM Force DUB 48/35
SRAM XG 1270 10-28 XDR
SRAM Force 12S 114L
Hunt - 48mm Limitless XDR
Vittoria Corsa TLR G2.0 700x25c
SRAM Force
SRAM Centerlock Centerline XR / F:160mm R:140mm
SRAM Force eTap AXS
SRAM Force eTap AXS
FSA SL-K SCR Compact
FSA ACR ST-OS-160
Ciclovation LEATHER TOUCH Tornado Gloss
Repente Prime 3.0
SRAM Rival eTap AXS
$6,600
Crystal Black Gloss
SUM Pro
SUM Pro specific
SUM specific (included with frameset)
FSA ACR NO.55R 1.5''
SRAM DUB PF 86.5
SRAM Rival eTAP AXS
SRAM Rival eTAP AXS (MAX 36T)
SRAM Rival DUB 48/35
SRAM Rival AXS XG 1250 10-30
SRAM Rival 12S 114L
Hunt 4 Season All-Road Centerlock 12x100/142 XDR
Vittoria Corsa TLR G2.0 700x25c
SRAM Rival
SRAM Centerlock Centerline / F:160mm R:140mm
SRAM Rival eTap AXS
SRAM Rival eTap AXS
FSA SL-K SCR Compact
FSA ACR ST-OS-160
Ciclovation LEATHER TOUCH Tornado Gloss
Repente Prime 3.0
Frameset
$4,400
Crystal Black Gloss
SUM Pro
SUM Pro specific
SUM specific (included with frameset)

Geometry

XXS44-46
XS47-50
S51-53
M54-56
L57-59
XL60-62
A
Seat tube Height
cm
39.5
42.5
46.0
50.5
55.0
59.5
B
Seat tube angle
deg
75.0
74.5
74.0
73.5
73.0
72.5
C
Head Tube Angle
deg
71.2
72.1
72.7
72.7
72.7
73.0
D
Top tube length
cm
50.3
52.0
53.8
55.7
57.8
60.0
E
Chain stay length
cm
41.0
41.0
41.0
41.0
41.0
41.0
F
Wheelbase
cm
96.7
97.2
97.5
99.0
100.6
102.0
G
BB Drop
cm
6.9
7.3
7.7
7.7
7.7
7.7
H1
Head Tube Length 3D (0mm)
cm
6.9
8.5
10.1
12.6
15.2
18.0
H2
Head Tube Length 3D (15mm)
cm
8.4
10.0
11.6
14.1
16.7
19.5
H3
Head Tube Length 3D (25mm)
cm
9.4
11.0
12.6
15.1
17.7
20.5
I
Stand Over Height
cm
67.6
70.0
72.7
76.6
80.4
84.1

Fit

(Stack and Reach)

XXS44-46
XS47-50
S51-53
M54-56
L57-59
XL60-62
J
Stack 3D (0mm)
cm
47.1
49.3
51.6
54.0
56.5
59.2
J
Stack 3D (15mm)
cm
48.5
50.7
53.0
55.4
57.9
60.6
J
Stack 3D (25mm)
cm
49.5
51.7
54.0
56.4
58.9
61.6
K
Reach 3D (0mm)
cm
37.5
38.2
38.9
39.7
40.5
41.4
K
Reach 3D (15mm)
cm
37.0
37.7
38.5
39.3
40.1
41.0
K
Reach 3D (25mm)
cm
36.7
37.4
38.2
39.0
39.8
40.7
Saddle Height Min
cm
56.5
59.5
63.0
67.5
72.0
76.5
Saddle Height Max
cm
71.5
74.5
78.0
82.5
87.0
91.5

Proud riders of Sum Pro

Reviews

Add your review

The best road bike I’ve ridden

By Mark Beaumont from GB, Edinburgh
Jan 30, 2022
A bike that combines endurance comfort with laser shape handling. I’ve got this built with C50 Dura Ace wheels and 12 sp Di2. In an XL frame set it is still under 7.5kg. Gives you a lot of confidence in the corners and climbs effortlessly. An impressive machine all round.