Viathon R.1 Dura-Ace

Name: Viathon R.1 Dura-Ace
Brand: Viathon

2021 RoadRace Manufacturer page

Last known price: $4,998

Prices shown first for United States
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 11 34–50t / 11–30t
Gear range: 401%
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

52cm 158–170
54cm 168–177
56cm 175–185
57.5cm Not informed
59cm Not informed

Components

16 of 19 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

VIATHON R.1 ROAD FRAME Not identified

Suspension

1 part

Fork

VIATHON R.1 ROAD FORK Not identified

Drivetrain

7 parts

Bottom bracket

ROTOR PRESS FIT 30TO24 CONVERTER Not identified
Cassette
- Shimano Dura-Ace CS-R9100
CS-R9100
Chain
- Shimano CN-HG901-11
CN-HG901-11CN-HG901
Crankset
- Shimano Dura-Ace FC-R9100 34t
FC-R9100
Front derailleur
- Shimano Dura-Ace FD-R9100 2 speeds
FD-R9100
Rear derailleur
- Shimano Dura-Ace RD-R9100
RD-R9100
Shifters
- Shimano Dura-Ace ST-R9120
ST-R9120

Brakes

3 parts

Wheels and tires

2 parts

Cockpit and contact points

5 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 56cm

Table

Reach 391mm

Stack 569mm

Wheelbase 988mm

Head angle 73.2°

Seat angle 73.0°

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 Reported by the manufacturer

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	380	386	391	397	408
Stackmm	527	550	569	584	612
Top tube lengthmm	534	550	565	576	602
Seat tube lengthmm	520	540	560	575	590
Head tube lengthmm	124	146	164	178	211
Head tube angle	72°	72.8°	73.2°	73.7°	74°
Seat tube angle	73.7°	73.4°	73°	73°	72.4°
Chainstay lengthmm	406	406	408	408	408
Wheelbasemm	973	979	988	993	1012
Front centermm	578	583	590	596	613
Bottom bracket dropmm	72	72	72	72	67
Bottom bracket heightmm	264	264	264	264	269
Fork rakemm	43	43	43	43	43
Trailmm	67.4	67.4	67.4	67.4	67.4
Stack/reach ratio	1.39	1.43	1.46	1.47	1.50

Not published by the manufacturer: Standover height, 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: 34
Largest chainring: 50
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 30
Lowest gear: 32.9 in
Highest gear: 131.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: PF30
Tire width: 25c
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

32.9 gear inches

This value is within the central range for this class.

Cohort: Road / Race Model year: 2021
Sample: 506 bicycles with this information
Coverage: 79.3% of the class

Highest gear

131.8 gear inches

This value is within the central range for this class.

Cohort: Road / Race Model year: 2021
Sample: 506 bicycles with this information
Coverage: 79.3% of the class

Shifting

Mechanical

286 of 638 bicycles with this information use electronic shifting.

Cohort: Road / Race Model year: 2021
Sample: 638 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 12.6 km/h
Highest gear: 50.5 km/h

Total gear range 401%

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: 32.9–131.8 gear inches
Class reference (p10–p90): 30.8–139.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Race Model year: 2021
Lowest gear: 506 bicycles with this information, 79.3% of the class
Highest gear: 506 bicycles with this information, 79.3% 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 2021 builds
Specification	This bicycle Viathon R.1 Dura-Ace	Viathon R.1 105	Viathon R.1 Red eTap AXS	Viathon R.1 Ultegra
Drivetrain
Smallest chainring	34	34	35	34
Largest chainring	50	50	48	50
Rear sprockets	11	11	12	11
Smallest sprocket	11	11	10	11
Largest sprocket	30	28	28	30
Lowest gear	32.9 in	35.2 in	36.3 in	32.9 in
Highest gear	131.8 in	131.8 in	139.2 in	131.8 in
Cockpit
Shifting	Mechanical	Mechanical	Electronic	Mechanical
Other specifications
Bottom bracket standard	PF30	Not informed	PF30	PF30
Wheel material	Carbon	Aluminum	Carbon	Carbon