Opus Zenith GRX12

Name: Opus Zenith GRX12
Brand: Opus

2025 RoadGravel Electric bicycle Manufacturer page

Suspension: Rigid
Wheels: 700c
Drivetrain: 2 × 12 30–46t / 11–34t
Gear range: 474%
Battery: 180 Wh
Weight: 14.1 kg 31.1 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 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

Gravel capable aluminum frame Not identified

Electric system

2 parts

Battery

Optional 180Wh 36V 4.8Ah range extender battery Not identified
Motor
- FSA

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
Chain
- Shimano Deore CN-M6100
CN-M6100
Crankset
- Shimano GRX FC-RX610 12 speeds
FC-RX610
Front derailleur
- Shimano
RD-RX820
Rear derailleur
- Shimano
FD-RX820
Shifters
- Shimano GRX ST-RX610
ST-RX610

Brakes

1 part

Brakes
- Shimano GRX BR-RX400
BR-RX400

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	391	400
Stackmm	534	554	573	592	611	631
Top tube lengthmm	515	530	544	559	578	599
Seat tube lengthmm	420	450	480	510	545	580
Head tube lengthmm	115	135	155	175	195	215
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	428	428	430	430	432	432
Bottom bracket dropmm	80	78	76	74	73	72
Bottom bracket heightmm	269	271	273	275	276	277
Standover heightmm	684	709	735	760	789	815
Stack/reach ratio	1.44	1.47	1.51	1.54	1.56	1.58
Suspension and parts
Crank lengthmm	165	170	170	172.5	172.5	175
Handlebar widthmm	380	400	420	420	440	440
Stem lengthmm	70	80	90	90	100	100

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: 14.1 kg

31.1 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

Electric system

Battery capacity: 180 Wh

Additional specifications

Battery: Optional 180Wh 36V 4.8Ah range extender battery
Bottom bracket standard: BB86/BB92
Tire clearance: Maximum tire width: 45c
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

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