Fahrradmanufaktur GX-800 / disc Shimano GRX Di2 RX825 12-speed

2026 RoadGravel Manufacturer page

Fahrradmanufaktur GX-800 / disc Shimano GRX Di2 RX825 12-speed, color Midnight Glossy

Suspension: Rigid
Wheels: 29″
Drivetrain: 1 × 12 42t / 10–51t
Gear range: 510%
Weight: 9.8 kg 21.6 lb · Reference configuration not specified
Brakes: Hydraulic disc

Sizes

Size guide

48cm
51cm
54cm
57cm
60cm

The manufacturer did not publish rider heights for these sizes.

Components

17 of 24 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

Reynold 725, Chrome-Moly, suspension-fork-ready Not identified

Suspension

1 part

Fork

vsf fm Gravel carbon, 12 x 100 mm, flatmount, tapered, Not identified

Drivetrain

6 parts

Cassette
- Shimano Deore XT CS-M8200-12 12 speeds
CS-M8200-12CS-M8200
Chain
- Shimano Deore XT CN-M8100
CN-M8100
Chain guide

N.V. Not identified
Crankset
- Shimano GRX FC-RX820-1 12 speeds
FC-RX820
Rear derailleur

N.V. Not identified
Shifters
- Shimano GRX
RD-RX827-SGS

Brakes

2 parts

Wheels and tires

5 parts

Cockpit and contact points

6 parts

Other components

3 parts

Fenders

, N.V. Not identified
Lights

N.V. Not identified
Racks

N.V. Not identified

Sizes and geometry

5 sizes

Rider-height ranges are not published for these sizes.

Size

Geometry not published

The manufacturer lists these sizes without frame measurements, so there is no drawing or geometry table.

Specifications

Frame and fork

Intended fit: Unisex
Fork material: Carbon
Bicycle weight: 9.8 kg

21.6 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 42
Largest chainring: 42
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 23.9 in
Highest gear: 121.8 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Electronic

Additional specifications

Tire width: 50c
Wheel material: Aluminum
Wheel size: 29″

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

23.9 gear inches

This value is below the central range for this class.

Cohort: Road / Gravel Model year: 2026
Sample: 1,452 bicycles with this information
Coverage: 73.2% of the class

Highest gear

121.8 gear inches

This value is within the central range for this class.

Cohort: Road / Gravel Model year: 2026
Sample: 1,452 bicycles with this information
Coverage: 73.2% of the class

Shifting

Electronic

706 of 1,977 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2026
Sample: 1,977 bicycles with this information
Coverage: 99.6% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 9.1 km/h
Highest gear: 46.7 km/h

Total gear range 510%

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: 23.9–121.8 gear inches
Class reference (p10–p90): 22.8–127.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2026
Lowest gear: 1452 bicycles with this information, 73.2% of the class
Highest gear: 1452 bicycles with this information, 73.2% of the class