Opus Horizon GRX 12

Name: Opus Horizon GRX 12
Brand: Opus

2025 RoadGravel Manufacturer page

Opus Horizon GRX 12, color Titanium Silver

Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 30–46t / 11–34t
Gear range: 474%
Weight: 10.16 kg 22.4 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

18 of 20 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

Meta 30 aluminum Not identified

Suspension

1 part

Fork

Full carbon tapered 1-1/2 to 1-1/8 in Not identified

Drivetrain

7 parts

Bottom bracket
- Shimano
Cassette
- Shimano 11–34t
Chain
- Shimano SLX CN-M7100
CN-M7100
Crankset
- Shimano GRX
Front derailleur
- Shimano GRX FD-RX820 2 speeds
FD-RX820
Rear derailleur
- Shimano GRX
GRX-820
Shifters
- Shimano GRX

Brakes

2 parts

Wheels and tires

4 parts

Cockpit and contact points

6 parts

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 SM

Table

Geometry diagram unavailable

The drawing needs wheelbase, which the manufacturer did not publish. Available facts remain in the table.

Size Reach Stack

Complete manufacturer geometry table 6 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	372	376	380	384	392	400
Stackmm	534	553	572	590	610	630
Top tube lengthmm	515	530	544	559	578	599
Seat tube lengthmm	420	450	480	510	545	580
Head tube lengthmm	113	133	153	173	193	213
Head tube angle	69.75°	70.5°	71°	71.5°	72°	72.5°
Seat tube angle	75°	74.5°	74°	73.5°	73°	72.5°
Chainstay lengthmm	425	425	427	427	429	429
Bottom bracket dropmm	80	78	76	74	73	72
Bottom bracket heightmm	269	271	273	275	276	277
Standover heightmm	718	743	766	791	818	847
Stack/reach ratio	1.44	1.47	1.51	1.54	1.56	1.58
Suspension and parts
Crank lengthmm	165	170	172.5	172.5	172.5	175
Handlebar widthmm	380	400	420	420	440	460
Stem lengthmm	70	80	90	100	110	110

Not published by the manufacturer: Wheelbase, Front center, Fork rake, Trail, Front travel, Rear travel, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Fork material: Carbon
Bicycle weight: 10.16 kg

22.4 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 30
Largest chainring: 46
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 34
Lowest gear: 25.6 in
Highest gear: 121.3 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire clearance: Maximum tire width: 45c
Tire width: 35c
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

25.6 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

Highest gear

121.3 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: 9.8 km/h
Highest gear: 46.4 km/h

Total gear range 474%

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: 25.6–121.3 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 Opus Horizon GRX 12	Opus Horizon 105 GRX	Opus Horizon Claris	Opus Horizon QR Claris	Opus Horizon FB	Opus Horizon QR
Frame
Fork material	Carbon	Carbon	Carbon	Steel	Steel	Steel
Bicycle weight	10.16 kg	10.34 kg	10.7 kg	12.1 kg	Not informed	12.07 kg
Drivetrain
Front chainrings	2	2	2	2	1	2
Smallest chainring	30	32	32	32	40	32
Largest chainring	46	48	48	48	40	48
Rear sprockets	12	11	8	8	10	8
Largest sprocket	34	34	32	32	48	32
Lowest gear	25.6 in	27.3 in	29.0 in	29.0 in	24.2 in	29.0 in
Highest gear	121.3 in	126.6 in	126.6 in	126.6 in	105.5 in	126.6 in
Brakes
Brake type	Hydraulic disc	Hydraulic disc	Hydraulic disc	Mechanical disc	Hydraulic disc	Mechanical disc
Other specifications
Tire clearance	Maximum tire width: 45c	Maximum tire width: 45c	Maximum tire width: 45c	Maximum tire width: 40c	Maximum tire width: 42c	Maximum tire width: 40c
Tire width	35c	35c	35c	35c	40c	35c
Bottom bracket standard	Not informed	BSA	BSA	BSA	Not informed	BSA