Dolan GXA Aluminium Disc Shimano GRX RX825 Di2 2x12

2025 RoadGravel Manufacturer page

Price: Not published

Prices shown first for United States
United Kingdom: £2,779 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 31–48t / 11–30t
Gear range: 422%
Frame: Aluminum
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 18 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

GXA Gravel Frame - (49cm X-SML) Not identified

Suspension

1 part

Fork
- Alpina

Drivetrain

7 parts

Bottom bracket

Tthreaded Not identified
Cassette
- Shimano Ultegra CS-R8100
CS-R8100
Chain
- Shimano Deore CN-M6100
CN-M6100
Crankset
- Shimano GRX FC-RX820-2 12 speeds 31t
FC-RX820
Front derailleur
- Shimano GRX FD-RX825 2 speeds
FD-RX825
Power meter

None-Powermeter-Fitted Not identified
Rear derailleur
- Shimano GRX RD-RX825 12 speeds
RD-RX825RD-RX825-DI2

Brakes

2 parts

Brakes

Front Brake (Right Position) Not identified
Disc rotors
- Shimano SM-RT800
SM-RT800

Wheels and tires

2 parts

Cockpit and contact points

5 parts

Sizes and geometry

6 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size 54cm

Table

Geometry diagram unavailable

The drawing needs wheelbase, chainstay length and bottom bracket drop / Bottom bracket height, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	366	370	371	380	383	404.2
Stackmm	541	560	572	592	609	624
Top tube lengthmm	525	535	545	560	575	595
Seat tube lengthmm	490	520	540	560	580	610
Head tube lengthmm	120	140	150	170	190	210
Head tube angle	70.5°	71°	71.5°	72°	72°	72°
Seat tube angle	74.5°	74°	73°	73°	72.5°	73°
Stack/reach ratio	1.48	1.51	1.54	1.56	1.59	1.54

Not published by the manufacturer: Chainstay length, Wheelbase, Front center, Bottom bracket drop, Bottom bracket height, Standover height, Fork rake, Trail, 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: Aluminum
Fork material: Carbon

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: 30
Lowest gear: 30.0 in
Highest gear: 126.6 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: 32c
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

30.0 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

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

Electronic

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: 11.5 km/h
Highest gear: 48.5 km/h

Total gear range 422%

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: 30.0–126.6 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 Dolan GXA Aluminium Disc Shimano GRX RX825 Di2 2x12	Dolan GXA Aluminium Disc Shimano 12s 105 R7120	Dolan GXA Aluminium Disc Shimano 12s 105 R7170 Di2	Dolan GXA Aluminium Disc Shimano GRX RX610 1x12 2x12	Dolan GXA Aluminium Disc Shimano GRX RX820 1x12 2x12
Drivetrain
Front chainrings	2	2	2	1	1
Smallest chainring	31	34	34	40	40
Largest chainring	48	50	50	40	40
Largest sprocket	30	34	34	34	30
Lowest gear	30.0 in	29.0 in	29.0 in	34.1 in	38.7 in
Highest gear	126.6 in	131.8 in	131.8 in	105.5 in	105.5 in
Cockpit
Shifting	Electronic	Mechanical	Electronic	Mechanical	Mechanical