Allied Alfa Disc Ultegra R8100 Di2

Name: Allied Alfa Disc Ultegra R8100 Di2
Brand: Allied

2022 RoadEndurance Manufacturer page

Last known price: $8,220

Prices shown first for United States
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 34–50t / 11–30t
Gear range: 401%
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

14 of 14 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.

Drivetrain

7 parts

Brakes

1 part

Brakes
- Shimano Ultegra
BR-R9170

Wheels and tires

2 parts

Cockpit and contact points

4 parts

Sizes and geometry

6 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 54cm

Table

Reach 389mm

Stack 539mm

Wheelbase 981mm

Head angle 73.0°

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 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	382	386	389	396	404	410
Stackmm	501	523	539	560	588	608
Top tube lengthmm	513	537	548	565	583	601
Seat tube lengthmm	482	512	532	552	572	602
Head tube lengthmm	97	117	137	157	187	207
Head tube angle	72.25°	73°	73°	73.5°	73.5°	74°
Seat tube angle	75.5°	74°	73.5°	73.25°	73°	72.5°
Chainstay lengthmm	410	410	410	410	410	410
Wheelbasemm	969	974	981	992	1008	1015
Front centermm	570	575	581	592	607	614
Bottom bracket dropmm	71.5	71.5	69	69	67.5	67.5
Bottom bracket heightmm	264	264	267	267	268	268
Standover heightmm	750	775	791	815	839	862
Fork rakemm	44	44	44	44	44	44
Trailmm	62	58	60	55	55	51
Stack/reach ratio	1.31	1.36	1.39	1.41	1.46	1.48

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: 0.88 kg

1.9 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 34
Largest chainring: 50
Rear sprockets: 12
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: Electronic

Additional specifications

Bottom bracket standard: BSA
Tire width: 28c
Wheel material: Aluminum
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 above the central range for this class.

Cohort: Road / Endurance Model year: 2022
Sample: 560 bicycles with this information
Coverage: 79.0% of the class

Highest gear

131.8 gear inches

This value is within the central range for this class.

Cohort: Road / Endurance Model year: 2022
Sample: 560 bicycles with this information
Coverage: 79.0% of the class

Shifting

Electronic

249 of 708 bicycles with this information use electronic shifting.

Cohort: Road / Endurance Model year: 2022
Sample: 708 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): 26.6–137.1 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Endurance Model year: 2022
Lowest gear: 560 bicycles with this information, 79.0% of the class
Highest gear: 560 bicycles with this information, 79.0% 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 2022 builds
Specification	This bicycle Allied Alfa Disc Ultegra R8100 Di2	Allied Alfa Disc Dura-Ace R9200 Di2	Allied Alfa Disc Force AXS	Allied Alfa Disc Red AXS	Allied Alfa Disc Rival AXS	Allied Alfa Disc Ultegra 8020 Mechanical
Drivetrain
Smallest chainring	34	34	33	35	33	34
Largest chainring	50	50	46	48	46	50
Rear sprockets	12	12	12	12	12	Not informed
Smallest sprocket	11	11	10	10	10	11
Largest sprocket	30	34	33	33	36	28
Lowest gear	32.9 in	29.0 in	29.0 in	30.8 in	26.6 in	35.2 in
Highest gear	131.8 in	131.8 in	133.4 in	139.2 in	133.4 in	131.8 in
Brakes
Brake type	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Mechanical disc
Cockpit
Seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost
Shifting	Electronic	Electronic	Electronic	Electronic	Electronic	Mechanical
Other specifications
Bottom bracket standard	BSA	BSA	Not informed	Not informed	BSA	Not informed
Wheel material	Aluminum	Carbon	Aluminum	Carbon	Aluminum	Aluminum