ARC8 Eero GRX 2x12

2025 RoadGravel Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €4,799 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 31–48t / 11–34t
Gear range: 479%
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 170–177
MD 174–182
LG 179–188
XL 186+

Components

11 of 17 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

ARC8 Eero Carbon Not identified

Suspension

1 part

Fork

ARC8 Eero Carbon Not identified

Drivetrain

7 parts

Bottom bracket
- Shimano SM-BBR60
SM-BBR60
Cassette
- Shimano Ultegra CS-R8101 12 speeds
CS-R8101
Chain
- Shimano Deore XT CN-M8100
CN-M8100
Crankset
- Shimano GRX FC-RX820 12 speeds 48/31t
FC-RX820
Front derailleur
- Shimano GRX FD-RX820 2 speeds
FD-RX820
Rear derailleur
- Shimano GRX
Shifters
- Shimano GRX ST-RX820
ST-RX820

Brakes

1 part

Brakes

Hydraulic Disc Not identified

Wheels and tires

2 parts

Cockpit and contact points

5 parts

Handlebar

Alloy handlebar with flare (width configurable) Not identified
Headset

ARC8 Not identified
Saddle
- Selle Italia Novus Boost Evo 3D
Seatpost
- Faserwerk
Stem

ICH Stem (length configurable) Not identified

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 376mm

Stack 568mm

Wheelbase 1012mm

Head angle 71.0°

Seat angle 73.5°

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 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	364	376	388	400
Stackmm	545	568	593	618
Top tube lengthmm	525	545	564	583
Seat tube lengthmm	510	550	570	600
Head tube lengthmm	137	157	170	197
Head tube angle	70°	71°	71°	71°
Seat tube angle	73.5°	73.5°	73.5°	73.5°
Chainstay lengthmm	420	420	420	420
Wheelbasemm	1002	1012	1032	1053
Front centermm	594	603	623	644
Bottom bracket dropmm	75	75	75	75
Bottom bracket heightmm	274	274	274	274
Standover heightmm	774	809	830	858
Fork rakemm	50	50	50	50
Trailmm	74	67	67	67
Stack/reach ratio	1.50	1.51	1.53	1.55

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
Frame weight: 0.99 kg

2.2 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 31
Largest chainring: 48
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 26.4 in
Highest gear: 126.6 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: BSA
Tire clearance: Maximum tire width: 50c
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

26.4 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2025
Sample: 1,536 bicycles with this information
Coverage: 76.6% of the class

Highest gear

126.6 gear inches

This value is above the central range for this class.

Cohort: Road / Gravel Model year: 2025
Sample: 1,536 bicycles with this information
Coverage: 76.6% of the class

Shifting

Mechanical

688 of 1,999 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2025
Sample: 1,999 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.1 km/h
Highest gear: 48.5 km/h

Total gear range 479%

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: 26.4–126.6 gear inches
Class reference (p10–p90): 22.8–126.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2025
Lowest gear: 1536 bicycles with this information, 76.6% of the class
Highest gear: 1536 bicycles with this information, 76.6% 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 2025 builds
Specification	This bicycle ARC8 Eero GRX 2x12	ARC8 Eero Force Wide AXS 1x12	ARC8 Eero Force XPLR AXS 1x13	ARC8 Eero GRX 1x12	ARC8 Eero GRX Di2 1x12	ARC8 Eero GRX Di2 2x12
Drivetrain
Front chainrings	2	1	1	1	1	2
Smallest chainring	31	42	42	42	42	31
Largest chainring	48	42	42	42	42	48
Rear sprockets	12	12	13	12	12	12
Smallest sprocket	11	Not informed	10	11	10	11
Largest sprocket	34	Not informed	46	51	51	34
Lowest gear	26.4 in	Not informed	26.5 in	23.9 in	23.9 in	26.4 in
Highest gear	126.6 in	Not informed	121.8 in	110.7 in	121.8 in	126.6 in
Cockpit
Shifting	Mechanical	Electronic	Electronic	Mechanical	Electronic	Electronic
Other specifications
Bottom bracket standard	BSA	Not informed	Not informed	BSA	BSA	BSA
Wheel material	Carbon	Carbon	Carbon	Aluminum	Carbon	Carbon
Battery	Not informed	Not informed	Not informed	Not informed	Shimano BRDN320	Shimano BRDN300