Specialized Aethos 2 Pro Shimano Ultegra Di2

Name: Specialized Aethos 2 Pro Shimano Ultegra Di2
Brand: Specialized

2026 RoadRace Manufacturer page

Specialized Aethos 2 Pro Shimano Ultegra Di2, color Gloss Shadow Silver / Emerald Metallic

Last known price: $8,499

Prices shown first for United States
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 36–52t / 11–30t
Gear range: 394%
Weight: 6.73 kg 14.8 lb · Reference configuration not specified
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

49cm 155–163
52cm 161–169
54cm 166–175
56cm 172–181
58cm 178–186
61cm 183–191

Components

13 of 16 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

Aethos 2 FACT 10r Carbon, Rider First Engineered™, Threaded BB, Hidden Cable Routing, 12x142mm thru-axle, flat-mount disc Not identified

Suspension

1 part

Fork

Aethos 2 FACT 10r Carbon, 12x100mm thru-axle, flat-mount disc Not identified

Drivetrain

8 parts

Brakes

1 part

Brakes
- Shimano Ultegra BR-R8170
BR-R8170

Wheels and tires

2 parts

Cockpit and contact points

3 parts

Handlebar
- Roval
Saddle

Power Pro Mirror, Hollow Ti rails Not identified
Seatpost
- Roval

Sizes and geometry

6 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 54cm

Table

Reach 384mm

Stack 559mm

Wheelbase 992mm

Head angle 72.5°

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 Reported by the manufacturer

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	373	377	384	391	398	404
Stackmm	522	538	559	580	606	627
Top tube lengthmm	508	526	544	557	572	584
Seat tube lengthmm	450	470	490	510	535	570
Head tube lengthmm	114	128	150	169	198	218
Head tube angle	71.4°	72.1°	72.5°	73°	73°	73.5°
Seat tube angle	75.5°	74.5°	74°	74°	74°	74°
Chainstay lengthmm	410	410	410	410	410	410
Wheelbasemm	978	981	992	998	1013	1020
Front centermm	581	584	594	599	614	621
Bottom bracket dropmm	76.5	76.5	75	75	73.5	73.5
Bottom bracket heightmm	265.5	265.5	267	267	268.5	268.5
Standover heightmm	719	737	759	779	805	834
Fork rakemm	50	50	50	47	47	47
Trailmm	62	58	55	55	55	52
Stack/reach ratio	1.40	1.43	1.46	1.48	1.52	1.55
Suspension and parts
Crank lengthmm	165	170	172.5	172.5	175	175
Handlebar widthmm	380	380	400	400	420	420
Stem lengthmm	80	90	100	100	110	110
Seatpost lengthmm	300	300	360	360	360	360

Not published by the manufacturer: Front travel, Rear travel, Stem angle and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Carbon
Fork material: Carbon
Bicycle weight: 6.73 kg

14.8 lb

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

Derailleur hanger: UDH
Seatpost: Rigid seatpost
Shifting: Electronic

Additional specifications

Bottom bracket standard: BSA
Power meter: Shimano Ultegra R8100 with 4iiii Precision 3+ single-sided Power Meter, 52/36t
Additional specification: Model display: Precision
Additional specification: Model id: precision
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

Differences across 2026 builds
Specification	This bicycle Specialized Aethos 2 Pro Shimano Ultegra Di2	Specialized Aethos 2 Expert Shimano Ultegra Di2	Specialized Aethos 2 Expert SRAM Force AXS	Specialized Aethos 2 Pro SRAM Force AXS	Specialized S-Works Aethos 2 Shimano Dura-Ace Di2	Specialized S-Works Aethos 2 SRAM Red AXS
Frame
Bicycle weight	6.73 kg	7.12 kg	7.05 kg	6.71 kg	6.05 kg	5.98 kg
Drivetrain
Smallest chainring	36	36	35	35	36	35
Largest chainring	52	52	48	48	52	48
Smallest sprocket	11	11	10	10	11	10
Largest sprocket	30	30	33	33	30	33
Lowest gear	34.8 in	34.8 in	30.8 in	30.8 in	34.8 in	30.8 in
Highest gear	137.1 in	137.1 in	139.2 in	139.2 in	137.1 in	139.2 in
Other specifications
Power meter	Shimano Ultegra R8100 with 4iiii Precision 3+ single-sided Power Meter, 52/36tAdditional specification: Model display: PrecisionAdditional specification: Model id: precision	Not informed	Not informed	SRAM Force E1 with Power Meter, 48/35tAdditional specification: Model display: Force AXSAdditional specification: Model id: force-axs	Shimano Dura-Ace R9200, HollowTech II, 12-speed with 4iiii Precision Pro dual-sided powermeter, 52/36tAdditional specification: Model display: Precision ProAdditional specification: Model id: precision-pro	SRAM RED AXS Power Meter, 48/35Additional specification: Model display: Red AXSAdditional specification: Model id: red-axs