Silverback Siablo CF GRX

2025 RoadGravel Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €2,999 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 12 40t / 10–51t
Gear range: 510%
Weight: 9.5 kg 20.9 lb · Reference configuration not specified
Frame: Carbon
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XXS 142–152
XS 150–161
SM 159–169
MD 167–179
LG 177–188

Components

11 of 21 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

Full Carbon Frame, Internal Cable Routing, Flat-mount Disc Brake Mounts. Supports 700C and 650B Wheelsize, including Internal Routed Dropper Post Compatible. Not identified

Suspension

1 part

Fork

700C Full Carbon Fork, 100x12mm Hub Spacing, for Internal Cable Routing, waterbottle and pannier mounts Not identified

Drivetrain

6 parts

Bottom bracket
- Shimano SM-BBR60
SM-BBR60
Cassette
- Shimano Deore CS-M6200 12 speeds 10–51t
CS-M6200
Chain
- Shimano Deore CN-M6100
CN-M6100
Crankset
- Shimano GRX FC-RX820-1 12 speeds 40t
FC-RX820
Rear derailleur
- Shimano GRX RD-RX822 12 speeds
RD-RX822
Shifters
- Shimano GRX ST-RX820
ST-RX820

Brakes

2 parts

Wheels and tires

4 parts

Front hub
- Shimano HB-RS470
HB-RS470
Rear hub
- Shimano
HB-RS470
Rims

F: SURFACE Alloy Rim, 21mm Internal Width, 30mm Depth, 28H Not identified
Tires
- Maxxis Rambler

Cockpit and contact points

7 parts

Grips

Surface Handlebar Wrap, Suede Black, Plug with Expander Bolt Not identified
Handlebar

SURFACE Alloy Handlebar, Ø 31.8mm, Reach: 77mm, Drop: 128mm, Flare: 16° Not identified
Headset

Siablo CF Headset, for Internal Cable Routing. IS52/28.6 IS52/40 Not identified
Pedals

Not Included Not identified
Saddle

SURFACE Saddle, Steel Rails Not identified
Seatpost

SURFACE Alloy, Ø 27.2mm Not identified
Stem

SURFACE Alloy Stem, 31.8mm, Rise ±7° Not identified

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size SM

Table

Reach 379mm

Stack 562mm

Wheelbase 1036mm

Head angle 71.0°

Seat angle 73.0°

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 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	365	370	379	388	397
Stackmm	529	548	562	581	604
Top tube lengthmm	517	537	551	571	588
Seat tube lengthmm	450	490	520	540	560
Head tube lengthmm	110	125	140	160	185
Head tube angle	70°	71°	71°	71°	71°
Seat tube angle	74°	73°	73°	72.5°	72.5°
Chainstay lengthmm	435	435	435	435	435
Wheelbasemm	1021	1023	1036	1052	1069
Front centermm	592	594	607	623	640
Bottom bracket dropmm	55	55	55	55	55
Bottom bracket heightmm	294	294	294	294	294
Standover heightmm	765	796	818	837	858
Fork rakemm	49	49	48	49	49
Trailmm	75	68	69	68	68
Stack/reach ratio	1.45	1.48	1.48	1.50	1.52

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
Bicycle weight: 9.5 kg

20.9 lb
Weight limit: 120 kg

264.6 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 40
Largest chainring: 40
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 22.8 in
Highest gear: 116.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Tire clearance: Maximum tire width: 50c
Tire width: 40c
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

22.8 gear inches

This value is below 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

116.0 gear inches

This value is within 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

Mechanical

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: 8.7 km/h
Highest gear: 44.4 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: 22.8–116.0 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 Silverback Siablo CF GRX	Silverback Siablo AL GRX
Frame
Frame material	Carbon	Aluminum
Bicycle weight	9.5 kg	10.6 kg
Drivetrain
Rear sprockets	12	11
Smallest sprocket	10	11
Largest sprocket	51	42
Lowest gear	22.8 in	27.6 in
Highest gear	116.0 in	105.5 in
Other specifications
Tire clearance	Maximum tire width: 50c	Maximum tire width: 45c
Tire width	40c	38c

Changes since 2024
Specification	2024 Silverback Siablo CF GRX	This bicycle Silverback Siablo CF GRX
Drivetrain
Rear sprockets	11	12
Smallest sprocket	11	10
Largest sprocket	42	51
Lowest gear	27.6 in	22.8 in
Highest gear	105.5 in	116.0 in
Other specifications
Bottom bracket standard	PF30	BSA
Tire clearance	Maximum tire width: 45c	Maximum tire width: 50c
Tire width	38c	40c