Allied Alfa Ultegra R8100 Di2

Name: Allied Alfa Ultegra R8100 Di2
Brand: Allied

2024 RoadEndurance Manufacturer page

Last known price: $9,195

Prices shown first for United States
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 36–52t / 11–30t
Gear range: 394%
Frame: Carbon
Brakes: Hydraulic disc

Sizes

Size guide

48cm
52cm
54cm
56cm
58cm
61cm

The manufacturer did not publish rider heights for these sizes.

Components

12 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

Handlebar
- Black Inc
Saddle
- Selle Italia Novus Boost Evo 3D
Seatpost

ALLIED ALFA Not identified
Stem

ALLIED Integrated Not identified

Sizes and geometry

6 sizes Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size 54cm

Table

Reach 389mm

Stack 550mm

Wheelbase 984mm

Head angle 73.0°

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 Reach Stack

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	375	383	389	396	404	410
Stackmm	515	530	550	570	595	620
Top tube lengthmm	523	535	547	565	580	594
Seat tube lengthmm	440	490	510	530	560	585
Head tube lengthmm	109	121	142	161	187	214
Head tube angle	72°	72.5°	73°	73.5°	73.5°	73.5°
Seat tube angle	74°	74°	74°	73.5°	73.5°	73.5°
Chainstay lengthmm	410	410	410	410	410	410
Wheelbasemm	968	972	984	993	1008	1021
Front centermm	569	573	585	594	609	622
Bottom bracket dropmm	73	73	73	73	73	73
Bottom bracket heightmm	263	263	263	263	263	263
Standover heightmm	750	780	780	800	830	855
Fork rakemm	44	44	44	44	44	44
Trailmm	64	65	58	55	55	55
Stack/reach ratio	1.37	1.38	1.41	1.44	1.47	1.51

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: 0.82 kg

1.8 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

Seatpost: Rigid seatpost
Shifting: Electronic

Additional specifications

Bottom bracket standard: BSA
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 / Endurance Model year: 2024
Sample: 639 bicycles with this information
Coverage: 76.7% of the class

Highest gear

137.1 gear inches

This value is above the central range for this class.

Cohort: Road / Endurance Model year: 2024
Sample: 639 bicycles with this information
Coverage: 76.7% of the class

Shifting

Electronic

430 of 833 bicycles with this information use electronic shifting.

Cohort: Road / Endurance Model year: 2024
Sample: 833 bicycles with this information
Coverage: 100.0% 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): 26.6–139.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Endurance Model year: 2024
Lowest gear: 639 bicycles with this information, 76.7% of the class
Highest gear: 639 bicycles with this information, 76.7% 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 2024 builds
Specification	This bicycle Allied Alfa Ultegra R8100 Di2	Allied Alfa Dura-Ace R9200 Di2	Allied Alfa Force AXS	Allied Alfa Red AXS	Allied Alfa Rival AXS	Allied Alfa Shimano Dura-Ace R9200 Di2
Drivetrain
Smallest chainring	36	36	35	35	33	36
Largest chainring	52	52	48	48	46	52
Smallest sprocket	11	11	10	10	10	11
Largest sprocket	30	34	33	33	36	34
Lowest gear	34.8 in	30.7 in	30.8 in	30.8 in	26.6 in	30.7 in
Highest gear	137.1 in	137.1 in	139.2 in	139.2 in	133.4 in	137.1 in
Other specifications
Bottom bracket standard	BSA	BSA	Not informed	BSA	BSA	BSA
Tire width	Not informed	28c	28c	28c	28c	28c